14-Bit, 500MSPS ADC ISLA214P50 Features The ISLA214P50 is a 14-bit, 500MSPS analog-to-digital converter designed with Intersil’s proprietary FemtoCharge™ technology on a standard CMOS process. The ISLA214P50 is part of a pin-compatible portfolio of 12 to 16-bit A/Ds with maximum sample rates ranging from 130MSPS to 500MSPS. The device utilizes two time-interleaved 250MSPS unit ADCs to achieve the ultimate sample rate of 500MSPS. A single 500MHz conversion clock is presented to the converter, and all interleave clocking is managed internally. The proprietary Intersil Interleave Engine (I2E) performs automatic correction of offset, gain, and sample time mismatches between the unit ADCs to optimize performance. A serial peripheral interface (SPI) port allows for extensive configurability of the A/D. The SPI also controls the interleave correction circuitry, allowing the system to issue offline and continuous calibration commands as well as configure many dynamic parameters. Digital output data is presented in selectable LVDS or CMOS formats. The ISLA214P50 is available in a 72 Ld QFN package with an exposed paddle. Operating from a 1.8V supply, performance is specified over the full industrial temperature range (-40°C to +85°C). • • • • Key Specifications CLKP CLKOUTN 14-BIT 250 MSPS ADC SHA D[13:0]P D[13:0]N VREF VINP Gain, Offset and Skew Adjustments VINN ORP I2E DIGITAL ERROR CORRECTION 14-BIT 250 MSPS ADC SHA VREF 1 OVSS RLVDS RESETN NAPSLP AVSS March 15, 2011 FN7571.1 SPI CONTROL CSB SCLK SDIO SDO + – VCM • Programmable Built-in Test Patterns • Multi-ADC Support - SPI Programmable Fine Gain and Offset Control - Support for Multiple ADC Synchronization - Optimized Output Timing • Nap and Sleep Modes - 200µs Sleep Wake-up Time • Data Output Clock • DDR LVDS-Compatible or LVCMOS Outputs • User-accessible Digital Temperature Monitor Applications • • • • • Radar Array Processing Software Defined Radios Broadband Communications High-Performance Data Acquisition Communications Test Equipment OVDD CLKOUTP CLOCK MANAGEMENT CLKN • 700MHz Bandwidth Pin-Compatible Family CLKDIVRSTN CLKDIVRSTP AVDD CLKDIV • SNR @ 500MSPS = 72.7dBFS fIN = 30MHz = 70.6dBFS fIN = 363MHz • SFDR @ 500MSPS = 84dBc fIN = 30MHz = 76dBc fIN = 363MHz • Total Power Consumption = 835mW @ 500MSPS Automatic Fine Interleave Correction Calibration Single Supply 1.8V Operation Clock Duty Cycle Stabilizer 75fs Clock Jitter ORN MODEL RESOLUTION SPEED (MSPS) ISLA216P25 16 250 ISLA216P20 16 200 ISLA216P13 16 130 ISLA214P50 14 500 ISLA214P25 14 250 ISLA214P20 14 200 ISLA214P13 14 130 ISLA212P50 12 500 ISLA212P25 12 250 ISLA212P20 12 200 ISLA212P13 12 130 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2011. All Rights Reserved Intersil (and design) and FemtoCharge are trademarks owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. ISLA214P50 Pin Configuration - LVDS MODE AVDD AVDD AVDD SDIO SCLK CSB SDO OVSS ORP ORN OVDD OVSS D0P D0N D1P D1N D2P D2N ISLA214P50 (72 LD QFN) TOP VIEW 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 DNC 1 54 D3P DNC 2 53 D3N NAPSLP 3 52 D4P VCM 4 51 D4N AVSS 5 50 D5P AVDD 6 49 D5N AVSS 7 48 CLKOUTP VINN 8 47 CLKOUTN VINN 9 46 RLVDS VINP 10 45 OVSS VINP 11 44 D6P AVSS 12 43 D6N AVDD 13 42 D7P AVSS 14 41 D7N CLKDIV 15 40 D8P IPTAT 16 DNC 17 39 D8N Thermal Pad Not Drawn to Scale, Consult Mechanical Drawing for Physical Dimensions Connect Thermal Pad to AVSS 38 D9P RESETN 18 CLKDIVRSTN 31 32 33 34 35 36 D10P CLKDIVRSTP 30 D10N CLKN 29 D11P CLKP 28 D11N AVDD 27 OVDD AVDD 26 D12P 25 D12N 23 24 D13P 22 D13N 21 OVDD 20 OVSS 19 AVDD 37 D9N Pin Descriptions - 72 Ld QFN, LVDS Mode PIN NUMBER LVDS PIN NAME 1, 2, 17 DNC Do Not Connect 6, 13, 19, 20, 21, 70, 71, 72 AVDD 1.8V Analog Supply 5, 7, 12, 14 AVSS Analog Ground 27, 32, 62 OVDD 1.8V Output Supply 26, 45, 61, 65 OVSS Output Ground 3 NAPSLP 4 VCM Common Mode Output 8, 9 VINN Analog Input Negative 2 LVDS PIN FUNCTION Tri-Level Power Control (Nap, Sleep modes) FN7571.1 March 15, 2011 ISLA214P50 Pin Descriptions - 72 Ld QFN, LVDS Mode PIN NUMBER LVDS PIN NAME 10, 11 VINP 15 CLKDIV 16 IPTAT 18 RESETN (Continued) LVDS PIN FUNCTION Analog Input Positive Tri-Level Clock Divider Control Temperature Monitor (Output current proportional to absolute temperature) Power On Reset (Active Low) 22, 23 CLKP, CLKN 24, 25 CLKDIVRSTP, CLKDIVRSTN Clock Input True, Complement 28, 29 D13N, D13P LVDS Bit 13 (MSB) Output Complement, True 30, 31 D12N, D12P LVDS Bit 12 Output Complement, True 33, 34 D11N, D11P LVDS Bit 11 Output Complement, True 35, 36 D10N, D10P LVDS Bit 10 Output Complement, True 37, 38 D9N, D9P LVDS Bit 9 Output Complement, True 39, 40 D8N, D8P LVDS Bit 8 Output Complement, True 41, 42 D7N, D7P LVDS Bit 7 Output Complement, True 43, 44 D6N, D6P LVDS Bit 6 Output Complement, True 46 RLVDS 47, 48 CLKOUTN, CLKOUTP LVDS Clock Output Complement, True 49, 50 D5N, D5P LVDS Bit 5 Output Complement, True 51, 52 D4N, D4P LVDS Bit 4 Output Complement, True 53, 54 D3N, D3P LVDS Bit 3 Output Complement, True 55, 56 D2N, D2P LVDS Bit 2 Output Complement, True Synchronous Clock Divider Reset True, Complement LVDS Bias Resistor (connect to OVSS with 1%10kW) 57, 58 D1N, D1P LVDS Bit 1 Output Complement, True 59, 60 D0N, D0P LVDS Bit 0 (LSB) Output Complement, True 63, 64 ORN, ORP LVDS Over Range Complement, True 66 SDO SPI Serial Data Output 67 CSB SPI Chip Select (active low) 68 SCLK SPI Clock 69 SDIO SPI Serial Data Input/Output Exposed Paddle AVSS Analog Ground 3 FN7571.1 March 15, 2011 ISLA214P50 Pin Configuration - CMOS MODE AVDD AVDD AVDD SDIO SCLK CSB SDO OVSS OR DNC OVDD OVSS D0 DNC D1 DNC D2 DNC ISLA214P50 (72 LD QFN) TOP VIEW 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 DNC 1 54 D3 DNC 2 53 DNC NAPSLP 3 52 D4 VCM 4 51 DNC AVSS 5 50 D5 AVDD 6 49 DNC AVSS 7 48 CLKOUT VINN 8 47 DNC VINN 9 46 RLVDS VINP 10 45 OVSS VINP 11 44 D6 AVSS 12 43 DNC AVDD 13 42 D7 AVSS 14 41 DNC CLKDIV 15 40 D8 39 DNC 38 D9 37 DNC IPTAT 16 DNC 17 Thermal Pad Not Drawn to Scale, Consult Mechanical Drawing for Physical Dimensions Connect Thermal Pad to AVSS D13 DNC D12 32 33 34 35 36 D10 31 DNC 30 D11 29 DNC 28 OVDD 27 DNC CLKDIVRSTN 26 OVDD 25 OVSS 24 CLKDIVRSTP 22 23 CLKN AVDD 21 CLKP 20 AVDD 19 AVDD RESETN 18 Pin Descriptions - 72 Ld QFN, CMOS Mode PIN NUMBER CMOS PIN NAME 1, 2, 17, 28, 30, 33, 35, 37, 39, 41, 43, 47, 49, 51, 53, 55, 57, 59, 63 DNC Do Not Connect 6, 13, 19, 20, 21, 70, 71, 72 AVDD 1.8V Analog Supply 5, 7, 12, 14 AVSS Analog Ground 27, 32, 62 OVDD 1.8V Output Supply 26, 45, 61, 65 OVSS Output Ground 3 NAPSLP 4 VCM 4 CMOS PIN FUNCTION Tri-Level Power Control (Nap, Sleep modes) Common Mode Output FN7571.1 March 15, 2011 ISLA214P50 Pin Descriptions - 72 Ld QFN, CMOS Mode PIN NUMBER CMOS PIN NAME 8, 9 VINN Analog Input Negative 10, 11 VINP Analog Input Positive 15 CLKDIV 16 IPTAT (Continued) CMOS PIN FUNCTION Tri-Level Clock Divider Control Temperature Monitor (Output current proportional to absolute temperature) 18 RESETN 22, 23 CLKP, CLKN 24, 25 CLKDIVRSTP, CLKDIVRSTN 29 D13 CMOS Bit 13 (MSB) Output 31 D12 CMOS Bit 12 Output 34 D11 CMOS Bit 11 Output 36 D10 CMOS Bit 10 Output 38 D9 CMOS Bit 9 Output 40 D8 CMOS Bit 8 Output 42 D7 CMOS Bit 7 Output 44 D6 CMOS Bit 6 Output 46 RLVDS LVDS Bias Resistor (connect to OVSS with 1%10kW) 48 CLKOUT CMOS Clock Output 50 D5 CMOS Bit 5 Output 52 D4 CMOS Bit 4 Output 54 D3 CMOS Bit 3 Output 56 D2 CMOS Bit 2 Output 58 D1 CMOS Bit 1 Output 60 D0 CMOS Bit 0 (LSB) Output 64 OR CMOS Over Range 66 SDO SPI Serial Data Output 67 CSB SPI Chip Select (active low) 68 SCLK SPI Clock 69 SDIO SPI Serial Data Input/Output Exposed Paddle AVSS Analog Ground 5 Power On Reset (Active Low) Clock Input True, Complement Synchronous Clock Divider Reset True, Complement FN7571.1 March 15, 2011 ISLA214P50 Ordering Information PART NUMBER (Notes 1, 2) PART MARKING ISLA214P50IRZ ISLA214P50 IRZ ISLA214P50IR72EV1Z Evaluation Board TEMP. RANGE (°C) -40 to +85 PACKAGE (Pb-free) 72 Ld QFN PKG. DWG. # L72.10x10E NOTES: 1. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate--e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 2. For Moisture Sensitivity Level (MSL), please see device information page for ISLA214P50. For more information on MSL please see techbrief TB363. 6 FN7571.1 March 15, 2011 ISLA214P50 Table of Contents Active Run State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Key Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 Pin-Compatible Family . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 FS/4 Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Pin Descriptions - 72 Ld QFN, LVDS Mode . . . . . . . . . . . . . 2 Nyquist Zones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 Pin Descriptions - 72 Ld QFN, CMOS Mode . . . . . . . . . . . . 4 Configurability and Communication . . . . . . . . . . . . . . .22 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . 8 Clock Divider Synchronous Reset . . . . . . . . . . . . . . . . . . . 22 Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Serial Peripheral Interface . . . . . . . . . . . . . . . . . . . . . . . . . 25 8 SPI Physical Interface . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Digital Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 SPI Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 I2E Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Device Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 Timing Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Device Configuration/Control . . . . . . . . . . . . . . . . . . . .26 Switching Specifications. . . . . . . . . . . . . . . . . . . . . . . . 13 Address 0x60-0x64: I2E initialization . . . . . . . . . . . . . 28 Typical Performance Curves. . . . . . . . . . . . . . . . . . . . . . . 14 Global Device Configuration/Control . . . . . . . . . . . . . .28 Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 SPI Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Equivalent Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Power-On Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 A/D Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . 35 User Initiated Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Temperature Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . 19 Split Ground and Power Planes . . . . . . . . . . . . . . . . . . 35 Analog Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Clock Input Considerations . . . . . . . . . . . . . . . . . . . . . .35 Clock Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Exposed Paddle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Jitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Bypass and Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Voltage Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 LVDS Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 LVCMOS Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Unused Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Nap/Sleep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 I2E Requirements and Restrictions. . . . . . . . . . . . . . . . . 21 Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . 37 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 7 FN7571.1 March 15, 2011 ISLA214P50 Absolute Maximum Ratings Thermal Information AVDD to AVSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.4V to 2.1V OVDD to OVSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.4V to 2.1V AVSS to OVSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 0.3V Analog Inputs to AVSS . . . . . . . . . . . . . . . . . . . . . . . . . -0.4V to AVDD + 0.3V Clock Inputs to AVSS . . . . . . . . . . . . . . . . . . . . . . . . . . -0.4V to AVDD + 0.3V Logic Input to AVSS . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.4V to OVDD + 0.3V Logic Inputs to OVSS . . . . . . . . . . . . . . . . . . . . . . . . . . -0.4V to OVDD + 0.3V Latchup (Tested per JESD-78C;Class 2,Level A . . . . . . . . . . . . . . . . 100mA Thermal Resistance (Typical) θJA (°C/W) θJC (°C/W) 72 Ld QFN (Notes 3, 4) . . . . . . . . . . . . . . . . 23 0.9 Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. NOTES: 3. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech Brief TB379. 4. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside. Electrical Specifications All specifications apply under the following conditions unless otherwise noted: AVDD = 1.8V, OVDD = 1.8V, TA = -40°C to +85°C (typical specifications at +25°C), AIN = -1dBFS, fSAMPLE = 500MSPS. Boldface limits apply over the operating temperature range, -40°C to +85°C. ISLA214P50 PARAMETER SYMBOL CONDITIONS MIN (Note 5) TYP MAX (Note 5) UNITS 1.95 2.0 2.15 VP-P DC SPECIFICATIONS (Note 6) Analog Input Full-Scale Analog Input Range VFS Differential Input Resistance RIN Differential 300 Ω Input Capacitance CIN Differential 9 pF 160 ppm/°C Full Scale Range Temp. Drift AVTC Input Offset Voltage VOS Common-Mode Output Voltage VCM 0.94 V Common-Mode Input Current (per pin) ICM 2.6 µA/MSPS Inputs Common Mode Voltage 0.9 V CLKP, CLKN Input Swing 1.8 V Full Temp -5.0 -1.3 5.0 mV Clock Inputs Power Requirements 1.8V Analog Supply Voltage AVDD 1.7 1.8 1.9 V 1.8V Digital Supply Voltage OVDD 1.7 1.8 1.9 V 1.8V Analog Supply Current IAVDD 374 391 mA 1.8V Digital Supply Current (Note 6) IOVDD 3mA LVDS, (I2E powered down, Fs/4 Filter powered down) 90 104 mA Power Supply Rejection Ratio PSRR 30MHz, 45mVP-P signal on AVDD 60 8 dB FN7571.1 March 15, 2011 ISLA214P50 Electrical Specifications All specifications apply under the following conditions unless otherwise noted: AVDD = 1.8V, OVDD = 1.8V, TA = -40°C to +85°C (typical specifications at +25°C), AIN = -1dBFS, fSAMPLE = 500MSPS. Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued) ISLA214P50 PARAMETER SYMBOL CONDITIONS MIN (Note 5) TYP MAX (Note 5) UNITS Total Power Dissipation Normal Mode PD Nap Mode PD Sleep Mode PD Nap/Sleep Mode Wakeup Time 2mA LVDS, (I2E powered down, Fs/4 Filter powered down) 809 3mA LVDS, (I2E powered down, Fs/4 Filter powered down) 835 3mA LVDS, (I2E on, Fs/4 Filter off) 867 3mA LVDS, (I2E on, Fs/4 Filter on) 900 958 mW 89 104 mW 7 19 mW CSB at logic high Sample Clock Running mW 891 mW mW 200 µs AC SPECIFICATIONS Differential Nonlinearity DNL fIN = 105MHz No Missing Codes Integral Nonlinearity INL fin = 105MHz Minimum Conversion Rate (Note 7) fS MIN Maximum Conversion Rate fS MAX Signal-to-Noise Ratio (Note 8) SNR SINAD ENOB fIN = 30MHz LSB LSB MSPS MSPS 72.7 dBFS 72.6 dBFS fIN = 190MHz 71.9 dBFS fIN = 363MHz 70.6 dBFS fIN = 461MHz 70.0 dBFS fIN = 605MHz 68.3 dBFS fIN = 30MHz 72.2 dBFS 71.7 dBFS fIN = 190MHz 70.7 dBFS fIN = 363MHz 69.3 dBFS fIN = 461MHz 64.7 dBFS fIN = 605MHz 60.7 dBFS fIN = 30MHz 11.70 Bits 11.62 Bits fIN = 190MHz 11.44 Bits fIN = 363MHz 11.22 Bits fIN = 461MHz 10.45 Bits fIN = 605MHz 9.79 Bits fIN = 105MHz 9 1.4 ±2.5 500 fIN = 105MHz Effective Number of Bits (Note 8) ±0.5 80 fIN = 105MHz Signal-to-Noise and Distortion (Note 8) -0.99 69.0 68.5 11.09 FN7571.1 March 15, 2011 ISLA214P50 Electrical Specifications All specifications apply under the following conditions unless otherwise noted: AVDD = 1.8V, OVDD = 1.8V, TA = -40°C to +85°C (typical specifications at +25°C), AIN = -1dBFS, fSAMPLE = 500MSPS. Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued) ISLA214P50 PARAMETER SYMBOL Spurious-Free Dynamic Range (Note 8) SFDR CONDITIONS fIN = 30MHz SFDRX23 Intermodulation Distortion IMD TYP MAX (Note 5) UNITS 84 dBc 82 dBc fIN = 190MHz 78 dBc fIN = 363MHz 76 dBc fIN = 461MHz 66 dBc fIN = 605MHz 61 dBc fIN = 30MHz 88 dBc fIN = 105MHz 89 dBc fIN = 190MHz 88 dBc fIN = 363MHz 83 dBc fIN = 461MHz 84 dBc fIN = 605MHz 77 dBc fIN = 70MHz 88 dBFS fIN = 170MHz 96 dBFS fIN = 105MHz Spurious-Free Dynamic Range Excluding H2,H3 (Note 8) MIN (Note 5) 72 Word Error Rate WER 10-12 Full Power Bandwidth FPBW 700 MHz NOTES: 5. Compliance to datasheet limits is assured by one of the following methods: production test, characterization and/or design. 6. Digital Supply Current is dependent upon the capacitive loading of the digital outputs. IOVDD specifications apply for 10pF load on each digital output. 7. The DLL Range setting must be changed for low speed operation. 8. Minimum specification guaranteed when calibrated at +85°C. Digital Specifications Boldface limits apply over the operating temperature range, -40°C to +85°C. PARAMETER SYMBOL CONDITIONS MIN (Note 5) TYP MAX (Note 5) UNITS 0 1 10 µA -25 -12 -8 µA 4 12 µA -600 -415 -300 µA 40 58 75 µA 5 10 µA 16 25 34 µA -25 -16 µA INPUTS (Note 9) Input Current High (RESETN) IIH VIN = 1.8V Input Current Low (RESETN) IIL VIN = 0V Input Current High (SDIO) IIH VIN = 1.8V Input Current Low (SDIO) IIL VIN = 0V Input Current High (CSB) IIH VIN = 1.8V Input Current Low (CSB) IIL VIN = 0V Input Current High (CLKDIV) IIH Input Current Low (CLKDIV) IIL -34 Input Voltage High (SDIO, RESETN) VIH 1.17 Input Voltage Low (SDIO, RESETN) VIL Input Capacitance CDI V .63 4 V pF LVDS INPUTS (CLKRSTP,CLKRSTN) Input Common Mode Range Input Differential Swing (peak to peak, single-ended) 10 VICM 825 1575 mV VID 250 450 mV FN7571.1 March 15, 2011 ISLA214P50 Digital Specifications Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued) PARAMETER SYMBOL CONDITIONS MIN (Note 5) MAX (Note 5) TYP UNITS CLKDIVRSTP Input Pull-down Resistance RIpd 100 kΩ CLKDIVRSTN Input Pull-up Resistance RIpu 100 kΩ 612 mVP-P LVDS OUTPUTS Differential Output Voltage (Note 10) VT 3mA Mode Output Offset Voltage VOS 3mA Mode 1120 1150 1200 mV Output Rise Time tR 240 ps Output Fall Time tF 240 ps CMOS OUTPUTS Voltage Output High VOH IOH = -500µA Voltage Output Low VOL IOL = 1mA OVDD - 0.3 OVDD - 0.1 V 0.1 0.3 V Output Rise Time tR 1.8 ns Output Fall Time tF 1.4 ns NOTES: 9. The Tri-Level Inputs internal switching thresholds are approximately. 0.43V and 1.34V. It is advised to float the inputs, tie to ground or AVDD depending on desired function. 10. The voltage is expressed in peak-to-peak differential swing. The peak-to-peak singled-ended swing is 1/2 of the differential swing. I2E Specifications Boldface limits apply over the operating temperature range, -40°C to +85°C. PARAMETER SYMBOL Offset Mismatch-induced Spurious Power I2E Settling Times I2Epost_t Minimum Duration of Valid Analog Input Largest Interleave Spur tTE CONDITIONS MIN (Note 5) No I2E Calibration performed -65 Active Run state enabled -70 Gain Mismatch Between Unit ADCs Offset Mismatch Between Unit ADCs 11 UNITS dBFS dBFS 1000 ms Allow one I2E iteration of Offset, Gain and Phase correction 100 µs -99 dBc -80 dBc fIN = 260MHz to 490MHz, Active Run State enabled, in Track Mode -99 dBc fIN = 260MHz to 490MHz, Active Run State enabled and previously settled, in Hold Mode -75 dBc Active Run State enabled, in Track Mode, fIN is a broadband signal in the 1st Nyquist zone -85 dBc Active Run State enabled, in Track Mode, fIN is a broadband signal in the 2nd Nyquist zone -75 dBc Active Run State enabled, in Track Mode 25 fs 0.01 %FS 1 mV fIN = 10MHz to 240MHz, Active Run State enabled and previously settled, in Hold Mode Sample Time Mismatch Between Unit ADCs MAX (Note 5) Calibration settling time for Active Run state fIN = 10MHz to 240MHz, Active Run State enabled, in Track Mode Total Interleave Spurious Power TYP -75 FN7571.1 March 15, 2011 ISLA214P50 Timing Diagrams INP INN tA CLKN CLKP LATENCY = L CYCLES tCPD CLKOUTN CLKOUTP tDC tPD D[13:0]N DATA N-L DATA N-L+1 DATA N D[13:0]P FIGURE 1A. LVDS INP INN tA CLK LATENCY = L CYCLES tCPD CLKOUT tDC tPD DATA N-L DATA N-L+1 DATA N D[13:0] FIGURE 1B. CMOS FIGURE 1. TIMING DIAGRAMS 12 FN7571.1 March 15, 2011 ISLA214P50 Switching Specifications Boldface limits apply over the operating temperature range, -40°C to +85°C. PARAMETER CONDITION SYMBOL MIN (Note 5) TYP MAX (Note 5) UNITS ADC OUTPUT Aperture Delay tA 114 ps RMS Aperture Jitter jA 75 fs Input Clock to Output Clock Propagation Delay Relative Input Clock to Output Clock Propagation Delay (Note 13) AVDD, OVDD = 1.7V to 1.9V, TA = -40°C to +85°C tCPD 1.65 2.4 3 ns AVDD, OVDD = 1.8V, TA = +25°C tCPD 1.9 2.3 2.75 ns AVDD, OVDD = 1.7V to 1.9V, TA = -40°C to +85°C dtCPD -450 450 ps tPD 1.65 2.4 3.5 ns Input Clock to Data Propagation Delay Output Clock to Data Propagation Delay, LVDS Mode Rising/Falling Edge tDC -0.1 0.16 0.5 ns Output Clock to Data Propagation Delay, CMOS Mode Rising/Falling Edge tDC -0.1 0.2 0.65 ns Synchronous Clock Divider Reset Setup Time (with respect to the positive edge of CLKP) tRSTS 0.4 0.06 Synchronous Clock Divider Reset Hold Time (with respect to the positive edge of CLKP) tRSTH 0.02 tRSTRT 52 µs L 20 cycles tOVR 2 cycles Synchronous Clock Divider Reset Recovery Time DLL recovery time after Synchronous Reset Latency (Pipeline Delay) Overvoltage Recovery ns 0.35 ns SPI INTERFACE (Notes 11, 12) SCLK Period Write Operation t CLK 32 cycles Read Operation tCLK 32 cycles CSB↓ to SCLK↑ Setup Time Read or Write tS 56 cycles CSB↑ after SCLK↑ Hold Time Write tH 10 cycles Data Valid to SCLK↑ Setup Time Write tDS 12 cycles Data Valid after SCLK↑ Hold Time Read or Write tDH 8 cycles Data Valid after SCLK↓ Time Read tDVR 10 cycles NOTES: 11. SPI Interface timing is directly proportional to the ADC sample period (tS). Values above reflect multiples of a 4ns sample period, and must be scaled proportionally for lower sample rates. ADC sample clock must be running for SPI communication. 12. The SPI may operate asynchronously with respect to the ADC sample clock. 13. The relative propagation delay is the difference in propagation time between any two devices that are matched in temperature and voltage, and is specified over the full operating temperature and voltage range. 13 FN7571.1 March 15, 2011 ISLA214P50 Typical Performance Curves All Typical Performance Characteristics apply under the following conditions unless otherwise noted: AVDD = OVDD = 1.8V, TA = +25°C, AIN = -1dBFS, fIN = 105MHz, fSAMPLE = 500MSPS. -55 HD2 AND HD3 MAGNITUDE (dBc) SNR (dBFS) AND SFDR (dBc) 95 90 SFDR (EXCLUDING H2,H3) 85 80 SFDR 75 SNR 70 65 60 55 0 100 200 300 400 500 -60 -65 -70 HD2 -75 -80 HD3 -85 -90 -95 600 0 100 INPUT FREQUENCY (MHz) FIGURE 2. SNR AND SFDR vs fIN 500 600 -10 0 FIGURE 3. HD2 AND HD3 vs fIN 100 90 200 300 400 INPUT FREQUENCY (MHz) -30 SFDR (dBFS) -40 HD2 (dBc) -50 SNR AND SFDR SNR AND SFDR 80 70 60 50 SNR (dBFS) SFDR (dBc) 40 SNR (dBc) -60 HD3 (dBc) -70 -80 -90 30 -100 20 -110 10 -60 -50 -40 -30 -20 -10 -120 -60 0 HD2 (dBFS) HD3 (dBFS) -50 FIGURE 4. SNR AND SFDR vs AIN -30 -20 FIGURE 5. HD2 AND HD3 vs AIN 90 -75 -80 SFDR 85 H3 -85 dBc SNR (dBFS) AND SFDR (dBc) -40 INPUT AMPLITUDE (dBFS) INPUT AMPLITUDE (dBFS) 80 -90 H2 -95 75 -100 SNR 70 250 300 350 400 SAMPLE RATE (MSPS) 450 FIGURE 6. SNR AND SFDR vs f SAMPLE 14 500 -105 250 300 350 400 SAMPLE RATE (MSPS) 450 500 FIGURE 7. HD2 AND HD3 vs fSAMPLE FN7571.1 March 15, 2011 ISLA214P50 Typical Performance Curves All Typical Performance Characteristics apply under the following conditions unless otherwise noted: AVDD = OVDD = 1.8V, TA = +25°C, AIN = -1dBFS, fIN = 105MHz, fSAMPLE = 500MSPS. (Continued) 1.00 900 0.75 0.50 DNL (LSBs) TOTAL POWER (mW) 850 800 750 0.25 0 -0.25 -0.50 700 -0.75 650 250 300 350 400 SAMPLE RATE (MSPS) 450 -1.00 0 500 SNR (dBFS) AND SFDR (dBc) 3 2 INL (LSBs) 6000 8000 10000 12000 14000 16000 CODE 90 4 1 0 -1 -2 -3 0 2000 4000 6000 85 80 75 70 65 60 0.75 8000 10000 12000 14000 16000 CODE FIGURE 10. INTEGRAL NONLINEARITY 0.85 0.90 0.95 1.00 VCM (V) 1.05 1.10 1.15 0 57701 60000 AMPLITUDE (dBFS) 52213 39405 40000 32263 30000 20000 9157 10000 0 4 1145 77 8 0 8174 8175 8176 8177 8178 8179 8180 8181 8182 8183 8184 8185 8186 8187 CODE FIGURE 12. NOISE HISTOGRAM 15 -40 -60 -80 -100 6846 64 1117 AIN = -1 dBFS SNR = 72.7 dBFS SFDR = 81 dBc SINAD = 71.81 dBFS -20 50000 0 0.80 FIGURE 11. SNR AND SFDR vs VCM 70000 NUMBER OF HITS 4000 FIGURE 9. DIFFERENTIAL NONLINEARITY FIGURE 8. POWER vs fSAMPLE IN 3mA LVDS MODE -4 2000 -120 0 50 100 150 FREQUENCY (MHz) 200 250 FIGURE 13. SINGLE-TONE SPECTRUM @ 105MHz FN7571.1 March 15, 2011 ISLA214P50 Typical Performance Curves All Typical Performance Characteristics apply under the following conditions unless otherwise noted: AVDD = OVDD = 1.8V, TA = +25°C, AIN = -1dBFS, fIN = 105MHz, fSAMPLE = 500MSPS. (Continued) 0 AIN = -1 dBFS SNR = 72.2 dBFS -20 SFDR = 79 dBc SINAD = 70.8 dBFS -40 AIN = -1.0 dBFS -60 -80 -100 -60 -80 -120 0 50 100 150 FREQUENCY (MHz) 200 0 250 FIGURE 14. SINGLE-TONE SPECTRUM @ 190MHz 50 100 150 FREQUENCY (MHz) IMD2 IMD3 2ND HARMONICS 3RD HARMONICS AMPLITUDE (dBFS) -20 -40 -60 -80 IMD3 = -88 dBFS -40 -60 -80 IMD3 = -96 dBFS -100 -100 0 50 100 150 200 -120 250 0 50 100 100 FIS (INTERLEAVING SPUR) 95 FIS IS APPROX. 96dB BELOW FULL SCALE AT CAL FREQUENCY 90 85 80 SFDR 75 70 SNR 30 50 70 90 110 130 150 170 190 210 230 250 FREQUENCY (MHz) FIGURE 18. INPUT FREQUENCY SWEEP WITH I2E FROZEN, I2E PREVIOUSLY CALIBRATED AT 105MHZ 16 200 250 FIGURE 17. TWO-TONE SPECTRUM (F1 = 170MHz, F2 = 171MHz -7dBFS) SNR (dBFS), SFDR (dBc) AND FIS (dBc) FIGURE 16. TWO-TONE SPECTRUM (F1 = 70MHz, F2 = 71MHz -7dBFS) 150 FREQUENCY (MHz) FREQUENCY (MHz) SNR (dBFS), SFDR (dBc) AND FIS (dBc) 250 0 IMD2 IMD3 2ND HARMONICS 3RD HARMONICS -20 65 200 FIGURE 15. SINGLE-TONE SPECTRUM @ 363MHz 0 AMPLITUDE (dBFS) -40 -100 -120 -120 SNR = 70.6 dBFS SFDR = 75 dBc SINAD = 69.4 dBFS -20 AMPLITUDE (dBFS) AMPLITUDE (dBFS) 0 100 FIS IS APPROX. 97dB BELOW FULL SCALE AT CAL FREQUENCY 95 90 85 FIS (INTERLEAVING SPUR) 80 75 SFDR 70 SNR 65 60 250 300 350 400 FREQUENCY (MHz) 450 500 FIGURE 19. INPUT FREQUENCY SWEEP WITH I2E FROZEN, I2E PREVIOUSLY CALIBRATED AT 363MHZ FN7571.1 March 15, 2011 ISLA214P50 Typical Performance Curves All Typical Performance Characteristics apply under the following conditions unless otherwise noted: AVDD = OVDD = 1.8V, TA = +25°C, AIN = -1dBFS, fIN = 105MHz, fSAMPLE = 500MSPS. (Continued) SNR (dBFS), SFDR (dBc) AND FIS (dBc) 85 SNR (dBFS) AND SFDR (dBc) SFDR IS DETERMINED BY FIS (INTERLEAVING SPUR) 80 SFDR (= FIS) 75 SNR 70 65 60 -40 -20 0 20 40 60 80 TEMPERATURE (°C) FIGURE 20. TEMPERATURE SWEEP WITH I2E FROZEN, I2E PREVIOUSLY CALIBRATED AT +25°C, F IN = 105MHZ Theory of Operation Functional Description The ISLA214P50 is based upon a 14-bit, 250MSPS A/D converter core that utilizes a pipelined successive approximation architecture (Figure 22). The input voltage is captured by a Sample-Hold Amplifier (SHA) and converted to a unit of charge. Proprietary charge-domain techniques are used to successively compare the input to a series of reference charges. Decisions made during the successive approximation operations determine the digital code for each input value. Digital error correction is also applied, resulting in a total latency of 20 clock cycles. This is evident to the user as a latency between the start of a conversion and the data being available on the digital outputs. The device contains two core A/D converters with carefully matched transfer characteristics. The cores are clocked on alternate clock edges, resulting in a doubling of the sample rate. Time–interleaved A/D systems can exhibit non–ideal artifacts in the frequency domain if the individual core A/D characteristics are not well matched. Gain, offset and timing skew mismatches are of primary concern. The Intersil Interleave Engine (I2E) performs automatic interleave calibration for the offset, gain, and sample time skew mismatch between the core A/Ds. The I2E circuitry also adjusts in real-time for temperature and voltage variations. Residual gain and sample time skew mismatch result in fundamental image spurs at fNYQUIST ± fIN. Offset mismatches create spurs at DC and multiples of fNYQUIST. Power-On Calibration As mentioned previously, the cores perform a self-calibration at start-up. An internal power-on-reset (POR) circuit detects the supply voltage ramps and initiates the calibration when the 17 100 95 90 FIS 85 SFDR 80 75 SNR 70 65 1.70 1.75 1.80 1.85 1.90 SUPPLY VOLTAGE (AVDD) FIGURE 21. ANALOG SUPPLY VOLTAGE SWEEP WITH I2E FROZEN, I2E PREVIOUSLY CALIBRATED AT 1.8V, FIN = 105MHZ analog and digital supply voltages are above a threshold. The following conditions must be adhered to for the power-on calibration to execute successfully: • A frequency-stable conversion clock must be applied to the CLKP/CLKN pins • DNC pins must not be connected • SDO has an internal pull-up and should not be driven externally • RESETN is pulled low by the ADC internally during POR. External driving of RESETN is optional. • SPI communications must not be attempted A user-initiated reset can subsequently be invoked in the event that the above conditions cannot be met at power-up. After the power supply has stabilized the internal POR releases RESETN and an internal pull-up pulls it high, which starts the calibration sequence. If a subsequent user-initiated reset is desired, the RESETN pin should be connected to an open-drain driver with an off-state/high impedance state leakage of less than 0.5mA to assure exit from the reset state so calibration can start. The calibration sequence is initiated on the rising edge of RESETN, as shown in Figure 23. Calibration status can be determined by reading the cal_status bit (LSB) at 0xB6. This bit is ‘0’ during calibration and goes to a logic ‘1’ when calibration is complete. The data outputs output 0xCCCC during calibration; this can also be used to determine calibration status. While RESETN is low, the output clock (CLKOUTP/CLKOUTN) is set low. Normal operation of the output clock resumes at the next input clock edge (CLKP/CLKN) after RESETN is de-asserted. At 250MSPS the nominal calibration time is 200ms, while the maximum calibration time is 550ms. FN7571.1 March 15, 2011 ISLA214P50 CLOCK GENERATION INP 2.5-BIT 2.5-BIT FLASH SHA FLASH INN 1.25V + – 6- STAGE 1.5-BIT/ STAGE 3- STAGE 1- BIT/ STAGE 3-BIT FLASH DIGITAL ERROR CORRECTION LVDS/ LVCMOS OUTPUTS FIGURE 22. A/D CORE BLOCK DIAGRAM CLKN CLKP CALIBRATION TIME RESETN CAL_STATUS BIT A supply voltage variation of less than 100mV will generally result in an SNR change of less than 0.5dBFS and SFDR change of less than 3dBc. CALIBRATION BEGINS CALIBRATION COMPLETE CLKOUTP FIGURE 23. CALIBRATION TIMING User Initiated Reset Recalibration of the A/D can be initiated at any time by driving the RESETN pin low for a minimum of one clock cycle. An open-drain driver with a drive strength in its high impedance state of less than 0.5mA is recommended, as RESETN has an internal high impedance pull-up to OVDD. As is the case during power-on reset, RESETN and DNC pins must be in the proper state for the calibration to successfully execute. The performance of the ISLA214P50 changes with variations in temperature, supply voltage or sample rate. The extent of these 18 changes may necessitate recalibration, depending on system performance requirements. Best performance will be achieved by recalibrating the A/D under the environmental conditions at which it will operate. In situations where the sample rate is not constant, best results will be obtained if the device is calibrated at the highest sample rate. Reducing the sample rate by less than 80MSPS will typically result in an SNR change of less than 0.5dBFS and an SFDR change of less than 3dBc. Figures 24 through 26 show the effect of temperature on SNR and SFDR performance with power on calibration performed at -40°C, +25°C, and +85°C. Each plot shows the variation of SNR/SFDR across temperature after a single power on calibration at -40°C, +25°C and +85°C. Best performance is typically achieved by a user-initiated power on calibration at the operating conditions, as stated earlier. Applications working across the full temperature range can use the on-chip calibration feature to maximize performance when large temperature variations are expected. FN7571.1 March 15, 2011 ISLA214P50 Temperature Calibration 90 90 SFDR (dBc) SFDR (dBc) 85 SNR AND SFDR SNR AND SFDR 85 80 75 75 SNR (dBFS) 70 -40 -35 -30 TEMPERATURE (°C) -25 -20 5 10 15 20 25 30 35 40 45 FIGURE 25. TYPICAL SNR, SFDR PERFORMANCE vs TEMPERATURE, DEVICE CALIBRATED AT +25°C, 500MSPS OPERATION, fIN = 105MHz Best performance is obtained when the analog inputs are driven differentially. The common-mode output voltage, VCM, should be used to properly bias the inputs as shown in Figures 28 through 30. An RF transformer will give the best noise and distortion performance for wideband and/or high intermediate frequency (IF) inputs. Two different transformer input schemes are shown in Figures 28 and 29. 85 SNR AND SFDR 70 SNR (dBFS) TEMPERATURE (°C) FIGURE 24. TYPICAL SNR, SFDR PERFORMANCE vs TEMPERATURE,DEVICE CALIBRATED AT -40°C, 500MSPS OPERATION, fIN = 105MHz SFDR (dBc) 80 80 ADT1-1WT 75 ADT1-1WT 1000pF SNR (dBFS) A/D VCM 70 65 70 75 80 85 TEMPERATURE (°C) FIGURE 26. TYPICAL SNR, SFDR PERFORMANCE vs TEMPERATURE, DEVICE CALIBRATED AT +85°C, 500MSPS OPERATION, fIN = 105MHz Analog Input A single fully differential input (VINP/VINN) connects to the sample and hold amplifier (SHA) of each unit A/D. The ideal full-scale input voltage is 2.0V, centered at the VCM voltage of 0.94V as shown in Figure 27. VINN 1.8 VINP 1.4 1.0 VCM 0.94V 1.0V 0.1µF FIGURE 28. TRANSFORMER INPUT FOR GENERAL PURPOSE APPLICATIONS ADTL1-12 1000pF TX-2-5-1 A/D VCM 1000pF FIGURE 29. TRANSMISSION-LINE TRANSFORMER INPUT FOR HIGH IF APPLICATIONS This dual transformer scheme is used to improve common-mode rejection, which keeps the common-mode level of the input matched to VCM. The value of the shunt resistor should be determined based on the desired load impedance. The differential input resistance of the ISLA214P50 is 300Ω. 0.6 0.2 FIGURE 27. ANALOG INPUT RANGE 19 The SHA design uses a switched capacitor input stage (see Figure 43 on page 34), which creates current spikes when the sampling capacitance is reconnected to the input voltage. This causes a disturbance at the input which must settle before the FN7571.1 March 15, 2011 ISLA214P50 next sampling point. Lower source impedance will result in faster settling and improved performance. Therefore a 1:1 transformer and low shunt resistance are recommended for optimal performance. TABLE 1. CLKDIV PIN SETTINGS CLKDIV PIN DIVIDE RATIO AVSS 2 Float 1 AVDD Not Allowed Jitter A/D In a sampled data system, clock jitter directly impacts the achievable SNR performance. The theoretical relationship between clock jitter (tJ) and SNR is shown in Equation 1 and is illustrated in Figure 32. 1 SNR = 20 log 10 ⎛ -------------------⎞ ⎝ 2πf t ⎠ Clock Input 100 95 tj = 0.1ps 90 14 BITS 85 SNR (dB) A differential amplifier, as shown in the simplified block diagram in Figure 30, can be used in applications that require DC-coupling. In this configuration, the amplifier will typically dominate the achievable SNR and distortion performance. Intersil’s new ISL552xx differential amplifier family can also be used in certain AC applications with minimal performance degradation. Contact the factory for more information. 80 tj = 1ps 75 The clock input circuit is a differential pair (see Figure 44). Driving these inputs with a high level (up to 1.8VP-P on each input) sine or square wave will provide the lowest jitter performance. A transformer with 4:1 impedance ratio will provide increased drive levels. The clock input is functional with AC-coupled LVDS, LVPECL, and CML drive levels. To maintain the lowest possible aperture jitter, it is recommended to have high slew rate at the zero crossing of the differential clock input signal. The recommended drive circuit is shown in Figure 31. A duty range of 40% to 60% is acceptable. The clock can be driven single-ended, but this will reduce the edge rate and may impact SNR performance. The clock inputs are internally self-biased to AVDD/2 to facilitate AC coupling. 1000pF tj = 10ps 60 10 BITS tj = 100ps 55 50 1M 10M 100M INPUT FREQUENCY (Hz) 1G FIGURE 32. SNR vs CLOCK JITTER This relationship shows the SNR that would be achieved if clock jitter were the only non-ideal factor. In reality, achievable SNR is limited by internal factors such as linearity, aperture jitter and thermal noise. Internal aperture jitter is the uncertainty in the sampling instant shown in Figure1A. The internal aperture jitter combines with the input clock jitter in a root-sum-square fashion, since they are not statistically correlated, and this determines the total jitter in the system. The total jitter, combined with other noise sources, then determines the achievable SNR. Voltage Reference CLKP 0.01µF 200 CLKN 1000pF 1000pF FIGURE 31. RECOMMENDED CLOCK DRIVE A selectable 2x frequency divider is provided in series with the clock input. The divider can be used in the 2x mode with a sample clock equal to twice the desired sample rate. This allows the use of the Phase Slip feature, which enables synchronization of multiple ADCs. The Phase Slip feature can be used as an alternative to using the CLKDIVRST pins to synchronize ADCs in a multiple ADC system. 20 12 BITS 70 65 TC4-19G2+ (EQ. 1) IN J FIGURE 30. DIFFERENTIAL AMPLIFIER INPUT A temperature compensated internal voltage reference provides the reference charges used in the successive approximation operations. The full-scale range of each A/D is proportional to the reference voltage. The nominal value of the voltage reference is 1.25V. Digital Outputs Output data is available as a parallel bus in LVDS-compatible(default) or CMOS modes. In either case, the data is presented in double data rate (DDR) format. Figures 1A and 1B show the timing relationships for LVDS and CMOS modes, respectively. Additionally, the drive current for LVDS mode can be set to a nominal 3mA(default) or a power-saving 2mA. The lower current setting can be used in designs where the receiver is in close physical proximity to the A/D. The applicability of this setting is dependent upon the PCB layout, therefore the user should FN7571.1 March 15, 2011 ISLA214P50 experiment to determine if performance degradation is observed. BINARY 13 12 11 •••• 1 0 The output mode can be controlled through the SPI port, by writing to address 0x73, see “Serial Peripheral Interface” on page 25. •••• An external resistor creates the bias for the LVDS drivers. A 10kΩ, 1% resistor must be connected from the RLVDS pin to OVSS. Power Dissipation GRAY CODE The power dissipated by the ISLA214P50 is primarily dependent on the sample rate and the output modes: LVDS vs CMOS and DDR vs SDR. There is a static bias in the analog supply, while the remaining power dissipation is linearly related to the sample rate. The output supply dissipation changes to a lesser degree in LVDS mode, but is more strongly related to the clock frequency in CMOS mode. 13 12 •••• 11 1 0 FIGURE 33. BINARY TO GRAY CODE CONVERSION Converting back to offset binary from Gray code must be done recursively, using the result of each bit for the next lower bit as shown in Figure 34. GRAY CODE 13 12 11 •••• 1 0 Nap/Sleep Portions of the device may be shut down to save power during times when operation of the A/D is not required. Two power saving modes are available: Nap, and Sleep. Nap mode reduces power dissipation to less than 104mW while Sleep mode reduces power dissipation to less than 19mW. •••• All digital outputs (Data, CLKOUT and OR) are placed in a high impedance state during Nap or Sleep. The input clock should remain running and at a fixed frequency during Nap or Sleep, and CSB should be high. Recovery time from Nap mode will increase if the clock is stopped, since the internal DLL can take up to 52µs to regain lock at 500MSPS. •••• By default after the device is powered on, the operational state is controlled by the NAPSLP pin as shown in Table 2. TABLE 2. NAPSLP PIN SETTINGS NAPSLP PIN MODE AVSS Normal Float Sleep AVDD Nap BINARY 13 12 11 •••• 1 0 Mapping of the input voltage to the various data formats is shown in Table 3. TABLE 3. INPUT VOLTAGE TO OUTPUT CODE MAPPING INPUT VOLTAGE OFFSET BINARY TWO’S COMPLEMENT GRAY CODE The power-down mode can also be controlled through the SPI port, which overrides the NAPSLP pin setting. Details on this are contained in “Serial Peripheral Interface” on page 25. –Full Scale 00 0000 0000 0000 10 0000 0000 0000 00 0000 0000 0000 Data Format –Full Scale + 1LSB 00 0000 0000 0001 10 0000 0000 0001 00 0000 0000 0001 Mid–Scale 10 0000 0000 0000 00 0000 0000 0000 11 0000 0000 0000 +Full Scale – 1LSB 11 1111 1111 1110 01 1111 1111 1110 10 0000 0000 0001 +Full Scale 11 1111 1111 1111 01 1111 1111 1111 10 0000 0000 0000 Output data can be presented in three formats: two’s complement (default), Gray code and offset binary. The data format can also be controlled through the SPI port, by writing to address 0x73. Details on this are contained in “Serial Peripheral Interface” on page 25. Offset binary coding maps the most negative input voltage to code 0x000 (all zeros) and the most positive input to 0xFFF (all ones). Two’s complement coding simply complements the MSB of the offset binary representation. When calculating Gray code the MSB is unchanged. The remaining bits are computed as the XOR of the current bit position and the next most significant bit. Figure 33 shows this operation. 21 FN7571.1 March 15, 2011 ISLA214P50 I2E Requirements and Restrictions Overview I2E is a blind and background capable algorithm, designed to transparently eliminate interleaving artifacts. This circuitry eliminates interleave artifacts due to offset, gain, and sample time mismatches between unit A/Ds, and across supply voltage and temperature variations in real-time. Differences in the offset, gain, and sample times of time-interleaved A/Ds create artifacts in the digital outputs. Each of these artifacts creates a unique signature that may be detectable in the captured samples. The I2E algorithm optimizes performance by detecting error signatures and adjusting each unit A/D using minimal additional power. I2E calibration is off by default at power-up. The I2E algorithm can be put in Active Run state via SPI. When the I2E algorithm is in Active Run state, it detects and corrects for offset, gain, and sample time mismatches in real time (see Track Mode description under “Active Run State” on page 22). However, certain analog input characteristics can obscure the estimation of these mismatches. The I2E algorithm is capable of detecting these obscuring analog input characteristics, and as long as they are present I2E will stop updating the correction in real time. Effectively, this freezes the current correction circuitry to the last known-good state (see Hold Mode description under “Active Run State” on page 22). Once the analog input signal stops obscuring the interleaved artifacts, the I2E algorithm will automatically start correcting for mismatch in real time again. Active Run State During the Active Run state the I2E algorithm actively suppresses artifacts due to interleaving based on statistics in the digitized data. I2E has two modes of operation in this state (described in the following), dynamically chosen in real-time by the algorithm based on the statistics of the analog input signal. 1. Track Mode refers to the default state of the algorithm, when all artifacts due to interleaving are actively being eliminated. To be in Track Mode the analog input signal to the device must adhere to the following requirements: • Possess total power greater than -20dBFS, integrated from 1MHz to Nyquist but excluding signal energy in a 100kHz band centered at fS/4 The criteria above assumes 500MSPS operation; the frequency bands should be scaled proportionally for lower sample rates. Note that the effect of excluding energy in the 100kHz band around of fS/4 exists in every Nyquist zone. This band generalizes to the form (N*fS/4 - 50kHz) to (N*fS/4 + 50kHz), where N is any odd integer. An input signal that violates these criteria briefly (approximately 10µs), before and after which it meets this criteria, will not impact system performance. The algorithm must be in Track Mode for approximately one second (defined as I2Epost_t on “I2E Specifications” on page 11) after power-up before the specifications apply. Once this requirement has 22 been met, the specifications of the device will continue to be met while I2E remains in Track Mode, even in the presence of temperature and supply voltage changes. 2. Hold Mode refers to the state of the I2E algorithm when the analog input signal does not meet the requirements specified above. If the algorithm detects that the signal no longer meets the criteria, it automatically enters Hold Mode. In Hold Mode, the I2E circuitry freezes the adjustment values based on the most recent set of valid input conditions. However, in Hold Mode, the I2E circuitry will not correct for new changes in interleave artifacts induced by supply voltage and temperature changes. The I2E circuitry will remain in Hold Mode until such time as the analog input signal meets the requirements for Track Mode. Power Meter The power meter calculates the average power of the analog input, and determines if it’s within range to allow operation in Track Mode. Both AC RMS and total RMS power are calculated, and there are separate SPI programmable thresholds and hysteresis values for each. FS/4 Filter A digital filter removes the signal energy in a 100kHz band around fS/4 before the I2E circuitry uses these samples for estimating offset, gain, and sample time mismatches (data samples produced by the A/D are unaffected by this filtering). This allows the I2E algorithm to continue in Active Run state while in the presence of a large amount of input energy near the fS/4 frequency. This filter can be powered down if it’s known that the signal characteristics won’t violate the restrictions. Powering down the FS/4 filter will reduce power consumption by approximately 30mW. Nyquist Zones The I2E circuitry allows the use of any one Nyquist zone without configuration, but requires the use of only one Nyquist zone. Inputs that switch dynamically between Nyquist zones will cause poor performance for the I2E circuitry. For example, I2E will function properly for a particular application that has fS = 500MSPS and uses the 1st Nyquist zone (0MHz to 250MHz). I2E will also function properly for an application that uses fS = 500MSPS and the 2nd Nyquist zone (250MHz to 500MHz). I2E will not function properly for an application that uses fS = 500MSPS, and input frequency bands from 150MHz to 210MHz and 250MHz to 290MHz simultaneously. There is no need to configure the I2E algorithm to use a particular Nyquist zone, but no dynamic switching between Nyquist zones is permitted while I2E is running. Configurability and Communication I2E can respond to status queries, be turned on and turned off, and generally configured via SPI programmable registers. Configuring of I2E is generally unnecessary unless the application cannot meet the requirements of Track Mode on or after power up. Parameters that can be adjusted and read back include FS/4 filter threshold and status, Power Meter threshold and status, and initial values for the offset, gain, and sample time values to use when I2E starts. FN7571.1 March 15, 2011 ISLA214P50 Clock Divider Synchronous Reset An output clock (CLKOUTP, CLKOUTN) is provided to facilitate latching of the sampled data. This clock is at half the frequency of the sample clock, and the absolute phase of the output clocks for multiple A/Ds is indeterminate. This feature allows the phase of multiple A/Ds to be synchronized (refer to Figure 35), which greatly simplifies data capture in systems employing multiple A/Ds. The reset signal must be well-timed with respect to the sample clock (see “Switching Specifications” Table on page 13). Sample Clock Input s1 L+td Analog Input (Note 14) s2 tRSTH CLKDIVRSTP (Note 15) tRSTS tRSTRT ADC1 Output Data s0 s1 s2 s3 s0 s1 s2 s3 ADC1 CLKOUTP ADC2 Output Data ADC2 CLKOUTP (phase 1) (Note 16) ADC2 CLKOUTP (phase 2) (Note 16) NOTES: 14. Delay equals fixed pipeline latency (L cycles) plus fixed analog propagation delay td 15. CLKDIVRSTP setup and hold times are with respect to input sample clock rising edge. CLKDIVRSTN is not shown, but must be driven, and is the compliment of CLKDIVRSTP 16. Either Output Clock Phase (phase 1 or phase 2 ) equally likely prior to synchronization. FIGURE 35. SYNCHRONOUS RESET OPERATION CSB SCLK SDIO R/W W1 W0 A12 A11 A10 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 FIGURE 36. MSB-FIRST ADDRESSING 23 FN7571.1 March 15, 2011 ISLA214P50 CSB SCLK SDIO A0 A1 A11 A2 A12 W0 W1 R/W D0 D1 D2 D3 D4 D5 D6 D7 FIGURE 37. LSB-FIRST ADDRESSING tDSW CSB tDHW tS t CLK tHI tH tLO SCLK SDIO W1 R/W W0 A12 A11 A10 A9 A8 A7 D5 D4 D3 D2 D1 D0 SPI WRITE FIGURE 38. SPI WRITE tDSW CSB tCLK tHI tDHW tH tDVR tS tLO SCLK WRITING A READ COMMAND READING DATA ( 3 WIRE MODE ) SDIO R/W W1 W0 A12 A11 A10 A9 A2 A1 A0 D7 D6 D3 D2 D1 D0 ( 4 WIRE MODE) SDO D7 D3 D2 D1 D0 FIGURE 39. SPI READ CSB STALLING CSB SCLK SDIO INSTRUCTION/ADDRESS DATA WORD 1 DATA WORD 2 FIGURE 40. 2-BYTE TRANSFER 24 FN7571.1 March 15, 2011 ISLA214P50 LAST LEGAL CSB STALLING CSB SCLK SDIO INSTRUCTION/ADDRESS DATA WORD 1 DATA WORD N FIGURE 41. N-BYTE TRANSFER Serial Peripheral Interface A serial peripheral interface (SPI) bus is used to facilitate configuration of the device and to optimize performance. The SPI bus consists of chip select (CSB), serial clock (SCLK) serial data output (SDO), and serial data input/output (SDIO). The maximum SCLK rate is equal to the A/D sample rate (fSAMPLE) divided by 32 for both write operations and read operations. At fSAMPLE = 500MHz, maximum SCLK is 15.63MHz for writing and read operations. There is no minimum SCLK rate. The following sections describe various registers that are used to configure the SPI or adjust performance or functional parameters. Many registers in the available address space (0x00 to 0xFF) are not defined in this document. Additionally, within a defined register there may be certain bits or bit combinations that are reserved. Undefined registers and undefined values within defined registers are reserved and should not be selected. Setting any reserved register or value may produce indeterminate results. SPI Physical Interface The serial clock pin (SCLK) provides synchronization for the data transfer. By default, all data is presented on the serial data input/output (SDIO) pin in three-wire mode. The state of the SDIO pin is set automatically in the communication protocol (described in the following). A dedicated serial data output pin (SDO) can be activated by setting 0x00[7] high to allow operation in four-wire mode. The SPI port operates in a half duplex master/slave configuration, with the ISLA214P50 functioning as a slave. Multiple slave devices can interface to a single master in threewire mode only, since the SDO output of an unaddressed device is asserted in four wire mode. The chip-select bar (CSB) pin determines when a slave device is being addressed. Multiple slave devices can be written to concurrently, but only one slave device can be read from at a given time (again, only in three-wire mode). If multiple slave devices are selected for reading at the same time, the results will be indeterminate. The communication protocol begins with an instruction/address phase. The first rising SCLK edge following a high to low transition on CSB determines the beginning of the two-byte instruction/address command; SCLK must be static low before the CSB transition. Data can be presented in MSB-first order or LSB-first order. The default is MSB-first, but this can be changed by setting 0x00[6] high. Figures 36 and 37 show the appropriate bit ordering for the MSB-first and LSB-first modes, respectively. In MSB-first mode, the address is incremented for multi-byte transfers, while in LSB-first mode it’s decremented. 25 In the default mode, the MSB is R/W, which determines if the data is to be read (active high) or written. The next two bits, W1 and W0, determine the number of data bytes to be read or written (see Table 4). The lower 13 bits contain the first address for the data transfer. This relationship is illustrated in Figure 38, and timing values are given in “Switching Specifications Boldface limits apply over the operating temperature range, -40°C to +85°C.” on page 13. After the instruction/address bytes have been read, the appropriate number of data bytes are written to or read from the A/D (based on the R/W bit status). The data transfer will continue as long as CSB remains low and SCLK is active. Stalling of the CSB pin is allowed at any byte boundary (instruction/address or data) if the number of bytes being transferred is three or less. For transfers of four bytes or more, CSB is allowed to stall in the middle of the instruction/address bytes or before the first data byte. If CSB transitions to a high state after that point the state machine will reset and terminate the data transfer. TABLE 4. BYTE TRANSFER SELECTION [W1:W0] BYTES TRANSFERRED 00 1 01 2 10 3 11 4 or more Figures 40 and 41 illustrate the timing relationships for 2-byte and N-byte transfers, respectively. The operation for a 3-byte transfer can be inferred from these diagrams. SPI Configuration ADDRESS 0X00: CHIP_PORT_CONFIG Bit ordering and SPI reset are controlled by this register. Bit order can be selected as MSB to LSB (MSB first) or LSB to MSB (LSB first) to accommodate various micro controllers. Bit 7 SDO Active Bit 6 LSB First Setting this bit high configures the SPI to interpret serial data as arriving in LSB to MSB order. Bit 5 Soft Reset Setting this bit high resets all SPI registers to default values. Bit 4 Reserved This bit should always be set high. FN7571.1 March 15, 2011 ISLA214P50 Bits 3:0 These bits should always mirror bits 4:7 to avoid ambiguity in bit ordering. ADDRESS 0X02: BURST_END If a series of sequential registers are to be set, burst mode can improve throughput by eliminating redundant addressing. Setting the burst_end address determines the end of the transfer; during a write operation, the user must be cautious to transmit the correct number of bytes based on the starting and ending addresses. Bits 7:0 Burst End Address This register value determines the ending address of the burst data. Device Information The default value of each register will be the result of the self-calibration after initial power-up. If a register is to be incremented or decremented, the user should first read the register value then write the incremented or decremented value back to the same register. TABLE 6. COARSE GAIN ADJUSTMENT 0x22[3:0] core 0 0x26[3:0] core 1 NOMINAL COARSE GAIN ADJUST (%) Bit3 +2.8 Bit2 +1.4 Bit1 -2.8 Bit0 -1.4 ADDRESS 0X08: CHIP_ID TABLE 7. MEDIUM AND FINE GAIN ADJUSTMENTS ADDRESS 0X09: CHIP_VERSION The generic die identifier and a revision number, respectively, can be read from these two registers. Device Configuration/Control A common SPI map, which can accommodate single-channel or multi-channel devices, is used for all Intersil A/D products. PARAMETER 0x23[7:0] MEDIUM GAIN 0x24[7:0] FINE GAIN Steps 256 256 –Full Scale (0x00) -2% -0.20% Mid–Scale (0x80) 0.00% 0.00% ADDRESS 0X20: OFFSET_COARSE_ADC0 +Full Scale (0xFF) +2% +0.2% ADDRESS 0X21: OFFSET_FINE_ADC0 Nominal Step Size 0.016% 0.0016% The input offset of the A/D core can be adjusted in fine and coarse steps. Both adjustments are made via an 8-bit word as detailed in Table 5. The data format is twos complement. The default value of each register will be the result of the selfcalibration after initial power-up. If a register is to be incremented or decremented, the user should first read the register value then write the incremented or decremented value back to the same register. TABLE 5. OFFSET ADJUSTMENTS PARAMETER 0x20[7:0] COARSE OFFSET 0x21[7:0] FINE OFFSET Steps 255 255 –Full Scale (0x00) -133LSB (-47mV) -5LSB (-1.75mV) Mid–Scale (0x80) 0.0LSB (0.0mV) 0.0LSB +Full Scale (0xFF) +133LSB (+47mV) +5LSB (+1.75mV) Nominal Step Size 1.04LSB (0.37mV) 0.04LSB (0.014mV) ADDRESS 0X25: MODES Two distinct reduced power modes can be selected. By default, the tri-level NAPSLP pin can select normal operation, nap or sleep modes (refer to“Nap/Sleep” on page 21). This functionality can be overridden and controlled through the SPI. This is an indexed function when controlled from the SPI, but a global function when driven from the pin. This register is not changed by a Soft Reset. TABLE 8. POWER-DOWN CONTROL VALUE 0x25[2:0] POWER DOWN MODE 000 Pin Control 001 Normal Operation 010 Nap Mode 100 Sleep Mode ADDRESS 0X26: OFFSET_COARSE_ADC1 ADDRESS 0X22: GAIN_COARSE__ADC0 ADDRESS 0X23: GAIN_MEDIUM_ADC0 ADDRESS 0X24: GAIN_FINE_ADC0 Gain of the A/D core can be adjusted in coarse, medium and fine steps. Coarse gain is a 4-bit adjustment while medium and fine are 8-bit. Multiple Coarse Gain Bits can be set for a total adjustment range of ±4.2%. (‘0011’ ≅ -4.2% and ‘1100’ ≅ +4.2%) It is recommended to use one of the coarse gain settings (-4.2%, -2.8%, -1.4%, 0, 1.4%, 2.8%, 4.2%) and fine-tune the gain using the registers at 23h and 24h. 26 ADDRESS 0X27: OFFSET_FINE_ADC1 The input offset of A/D core#1 can be adjusted in fine and coarse steps in the same way that offset for core#0 can be adjusted. Both adjustments are made via an 8-bit word as detailed in Table 5. The data format is twos complement. The default value of each register will be the result of the self-calibration after initial power-up. If a register is to be incremented or decremented, the user should first read the register value then write the incremented or decremented value back to the same register. FN7571.1 March 15, 2011 ISLA214P50 ADDRESS 0X28: GAIN_COARSE__ADC1 ADDRESS 0X29: GAIN_MEDIUM_ADC1 ADDRESS 0X2A: GAIN_FINE_ADC1 Gain of A/D core #1 can be adjusted in coarse, medium and fine steps in the same way that core #0 can be adjusted. Coarse gain is a 4-bit adjustment while medium and fine are 8-bit. Multiple Coarse Gain Bits can be set for a total adjustment range of ±4.2. turned on. This bit would typically be used if optimal analog adjustment values for offset, gain, and sample time skew have been preloaded in order to have the I2E algorithm converge more quickly. The system gain of the pair of interleaved core A/Ds can be set by programming the medium and fine gain of the reference A/D before turning I2E on. In this case, I2E will adjust the non-reference A/D’s gain to match the reference A/D’s gain. Bit 7: Reserved, always set to 0 ADDRESS 0X30: I2E STATUS ADDRESS 0X4A: I2E POWER DOWN The I2E general status register. This register provides the capability to completely power down the I2E algorithm and the Notch filter. This would typically be done to conserve power. Bits 0 and 1 indicate if the I2E circuitry is in Active Run or Hold state. The state of the I2E circuitry is dependent on the analog input signal itself. If the input signal obscures the interleave mismatched artifacts such that I2E cannot estimate the mismatch, the algorithm will dynamically enter the Hold state. For example, a DC mid-scale input to the A/D does not contain sufficient information to estimate the gain and sample time skew mismatches, and thus the I2E algorithm will enter the Hold state. In the Hold state, the analog adjustments for interleave correction will be frozen and mismatch estimate calculations will cease until such time as the analog input achieves sufficient quality to allow the I2E algorithm to make mismatch estimates again. Bit 0: 0 = I2E has not detected a low power condition. 1 = I2E has detected a low power condition, and the analog adjustments for interleave correction are frozen. Bit 1: 0 = I2E has not detected a low AC power condition. 1 = I2E has detected a low AC power condition, and I2E will continue to correct with best known information but will not update its interleave correction adjustments until the input signal achieves sufficient AC RMS power. Bit 2: When first started, the I2E algorithm can take a significant amount of time to settle (~1s), dependent on the characteristics of the analog input signal. 0 = I2E is still settling, 1 = I2E has completed settling. ADDRESS 0X31: I2E CONTROL The I2E general control register. This register can be written while I2E is running to control various parameters. Bit 0: 0 = turn I2E off, 1= turn I2E on Bit 1: 0 = no action, 1 = freeze I2E, leaving all settings in the current state. Subsequently writing a 0 to this bit will allow I2E to continue from the state it was left in. Bit 2-4: Disable any of the interleave adjustments of offset, gain, or sample time skew Bit 5: 0 = bypass notch filter, 1 = use notch filter on incoming data before estimating interleave mismatch terms ADDRESS 0X32: I2E STATIC CONTROL The I2E general static control register. This register must be written prior to turning I2E on for the settings to take effect. Bit 1-4: Reserved, always set to 0 Bit 5: 0 = normal operation, 1 = skip coarse adjustment of the offset, gain, and sample time skew analog controls when I2E is first 27 BIT 0: Power down the I2E Algorithm BIT 1: Power down the Notch Filter ADDRESS 0X50-0X55: I2E FREEZE THRESHOLDS This group of registers provides programming access to configure I2E’s dynamic freeze control. As with any interleave mismatch correction algorithm making estimates of the interleave mismatch errors using the digitized application input signal, there are certain characteristics of the input signal that can obscure the mismatch estimates. For example, a DC input to the A/D contains no information about the sample time skew mismatch between the core A/Ds, and thus should not be used by the I2E algorithm to update its sample time skew estimate. Under such circumstances, I2E enters Hold state. In the Hold state, the analog adjustments will be frozen and mismatch estimate calculations will cease until such time as the analog input achieves sufficient quality to allow the I2E algorithm to make mismatch estimates again. These registers allow the programming of the thresholds of the meters used to determine the quality of the input signal. This can be used by the application to optimize I2E’s behavior based on knowledge of the input signal. For example, if a specific application had an input signal that was typically 30dB down from full scale, and was primarily concerned about analog performance of the A/D at this input power, lowering the RMS power threshold would allow I2E to continue tracking with this input power level, thus allowing it to track over voltage and temperature changes. 0x50 (LSBs), 0x51 (MSBs) RMS Power Threshold This 16-bit quantity is the RMS power threshold at which I2E will enter Hold state. The RMS power of the analog input is calculated continuously by I2E on incoming data. Only the upper 12 bits of the ADC sample outputs are used in the averaging process for comparison to the power threshold registers. A 12-bit number squared produces a 24-bit result (for A/D resolutions under 12-bits, the A/D samples are MSB-aligned to 12-bit data). A dynamic number of these 24-bit results are averaged to compare with this threshold approximately every 1µs to decide whether or not to freeze I2E. The 24-bit threshold is constructed with bits 23 through 20 (MSBs) assigned to 0, bits 19 through 4 assigned to this 16-bit quantity, and bits 3 through 0 (LSBs) assigned to 0. As an example, if the application wanted to set this threshold to trigger near the RMS analog input of a -20dBFS sinusoidal input, the calculation to determine this register’s value would be: FN7571.1 March 15, 2011 ISLA214P50 2 RMS codes = ------- × 10 2 20⎞ ⎛ –--------⎝ 20 ⎠ 0x55 AC RMS Power Hysteresis ×2 12 ≅ ( 290 )codes (EQ. 2) 2 hex ( ( ( 290 ) ) ) = 0x14884 TruncateMSBandLSBhexdigit = 0x1488 (EQ. 3) Therefore, programming 0x1488 into these two registers will cause I2E to freeze when the signal being digitized has less RMS power than a -20dBFS sinusoid. The default value of this register is 0x1000, causing I2E to freeze when the input amplitude is less than -21.2 dBFS. The freezing of I2E by the RMS power meter threshold affects the gain and sample time skew interleave mismatch estimates, but not the offset mismatch estimate. 0x52 RMS Power Hysteresis In order to prevent I2E from constantly oscillating between the Hold and Track state, there is hysteresis in the comparison described above. After I2E enters a frozen state, the RMS input power must achieve ³ threshold value + hysteresis to again enter the Track state. The hysteresis quantity is a 24-bit value, constructed with bits 23 through 12 (MSBs) being assigned to 0, bits 11 through 4 assigned to this register’s value, and bits 3 through 0 (LSBs) assigned to 0. 0X53(LSBS), 0X54(MSBS) AC RMS POWER THRESHOLD Similar to RMS power threshold, there must be sufficient AC RMS power (or dV/dt) of the input signal to measure sample time skew mismatch for an arbitrary input. This is clear from observing the effect when a high voltage (and therefore large RMS value) DC input is applied to the A/D input. Without sufficient dV/dt in the input signal, no information about the sample time skew between the core A/Ds can be determined from the digitized samples. The AC RMS Power Meter is implemented as a high-passed (via DSP) RMS power meter. The required algorithm is documented as follows. 1. Write the MSBs of the 16-bit quantity to SPI Address 0x54 2. Write the LSBs of the 16-bit quantity to SPI Address 0x53 Only the upper 12 bits of the ADC sample outputs are used in the averaging process for comparison to the power threshold registers. A 12-bit number squared produces a 24-bit result (for A/D resolutions under 12-bits, the A/D samples are MSB-aligned to 12-bit data). A dynamic number of these 24-bit results are averaged to compare with this threshold approximately every 1µs to decide whether or not to freeze I2E. The 24-bit threshold is constructed with bits 23 through 20 (MSBs) assigned to 0, bits 19 through 4 assigned to this 16-bit quantity, and bits 3 through 0 (LSBs) assigned to 0. The calculation methodology to set this register is identical to the description in the RMS power threshold description. In order to prevent I2E from constantly oscillating between the Hold and Track state, there is hysteresis in the comparison described above. After I2E enters a frozen state, the AC RMS input power must achieve ³ threshold value + hysteresis to again enter the Track state. The hysteresis quantity is a 24-bit value, constructed with bits 23 through 12 (MSBs) being assigned to 0, bits 11 through 4 assigned to this register’s value, and bits 3 through 0 (LSBs) assigned to 0. Address 0x60-0x64: I2E initialization These registers provide access to the initialization values for each of offset, gain, and sample time skew that I2E programs into the target core A/D before adjusting to minimize interleave mismatch. They can be used by the system to, for example, reduce the convergence time of the I2E algorithm by programming in the optimal values before turning I2E on. In this case, I2E only needs to adjust for temperature and voltage-induced changes since the optimal values were recorded. Global Device Configuration/Control ADDRESS 0X70: SKEW_DIFF The value in the skew_diff register adjusts the timing skew between the two A/D cores. The nominal range and resolution of this adjustment are given in Table 9. The default value of this register after power-up is 80h. TABLE 9. DIFFERENTIAL SKEW ADJUSTMENT PARAMETER 0x70[7:0] DIFFERENTIAL SKEW Steps 256 –Full Scale (0x00) -6.5ps Mid–Scale (0x80) 0.0ps +Full Scale (0xFF) +6.5ps Nominal Step Size 51fs ADDRESS 0X71: PHASE_SLIP The output data clock is generated by dividing down the A/D input sample clock. Some systems with multiple A/Ds can more easily latch the data from each A/D by controlling the phase of the output data clock. This control is accomplished through the use of the phase_slip SPI feature, which allows the rising edge of the output data clock to be advanced by one input clock period, as shown in the Figure 42. Execution of a phase_slip command is accomplished by first writing a '0' to bit 0 at address 0x71, followed by writing a '1' to bit 0 at address 0x71. The freezing of I2E when the AC RMS power meter threshold is not met affects the sample time skew interleave mismatch estimate, but not the offset or gain mismatch estimates. 28 FN7571.1 March 15, 2011 ISLA214P50 ADDRESS 0X74: OUTPUT_MODE_B ADC Input Clock (500MHz) Bit 6 DLL Range 2ns Output Data Clock (250MHz) No clock_slip 4ns This bit sets the DLL operating range to fast (default) or slow. Internal clock signals are generated by a delay-locked loop (DLL), which has a finite operating range. Table 13 shows the allowable sample rate ranges for the slow and fast settings. Note that Bit 4 at 0x74 is reserved and must not change value. A user writing to Bit 6 should first read 0x74 to determine proper value to write back to Bit 4 when writing to 0x74. 2n s Output Data Clock (250MHz) 1 clock_slip Output Data Clock (250MHz) 2 clock_slip TABLE 13. DLL RANGES FIGURE 42. PHASE SLIP ADDRESS 0X72: CLOCK_DIVIDE The ISLA214P50 has a selectable clock divider that can be set to divide by two or one (no division). By default, the tri-level CLKDIV pin selects the divisor This functionality can be overridden and controlled through the SPI, as shown in Table 10. This register is not changed by a Soft Reset. TABLE 10. CLOCK DIVIDER SELECTION VALUE 0x72[2:0] CLOCK DIVIDER 000 Pin Control 001 Divide by 1 010 Divide by 2 other Not Allowed ADDRESS 0X73: OUTPUT_MODE_A The output_mode_A register controls the physical output format of the data, as well as the logical coding. The ISLA214P50 can present output data in two physical formats: LVDS (default) or LVCMOS. Additionally, the drive strength in LVDS mode can be set high (default, 3mA or low (2mA). Data can be coded in three possible formats: two’s complement (default), Gray code or offset binary. See Table 12. This register is not changed by a Soft Reset. TABLE 11. OUTPUT MODE CONTROL VALUE 0x73[7:5] OUTPUT MODE 000 LVDS 3mA (Default) 001 LVDS 2mA 100 LVCMOS DLL RANGE MIN MAX UNIT Slow 80 200 MSPS Fast 160 500 MSPS ADDRESS 0XB6: CALIBRATION STATUS The LSB at address 0xB6 can be read to determine calibration status. The bit is ‘0’ during calibration and goes to a logic ‘1’ when calibration is complete.This register is unique in that it can be read after POR at calibration, unlike the other registers on chip, which can’t be read until calibration is complete. DEVICE TEST The ISLA214P50 can produce preset or user defined patterns on the digital outputs to facilitate in-situ testing. A user can pick from preset built-in patterns by writing to the output test mode field [7:4] at C0h or user defined patterns by writing to the user test mode field [2:0] at C0h. The user defined patterns should be loaded at address space C1 through D0, see the “SPI Memory Map” on page 31 for more detail. The predefined patterns are shown in Table 14. The test mode is enabled asynchronously to the sample clock, therefore several sample clock cycles may elapse before the data is present on the output bus. ADDRESS 0XC0: TEST_IO Bits 7:4 Output Test Mode These bits set the test mode according to table below. Other values are reserved.User test patterns loaded at 0xC1 through 0xD0 are also available by writing ‘1000’ to [7:4] at 0xC0 and a pattern depth value to [2:0] at 0xC0. See the memory map. Bits 2:0 User Test Mode The three LSBs in this register determine the test pattern in combination with registers 0xC1 through 0xD0. Refer to the SPI Memory Map on page 31. TABLE 12. OUTPUT FORMAT CONTROL VALUE 0x73[2:0] OUTPUT FORMAT 000 Two’s Complement (Default) 010 Gray Code 100 Offset Binary 29 FN7571.1 March 15, 2011 ISLA214P50 ADDRESS 0XCF: USER_PATT8_LSB TABLE 14. OUTPUT TEST MODES VALUE 0xC0[7:4] OUTPUT TEST MODE 0000 Off WORD 1 WORD 2 0001 Midscale 0x8000 N/A 0010 Positive Full-Scale 0xFFFF N/A 0011 Negative Full-Scale 0x0000 N/A 0100 Reserved N/A N/A 0101 Reserved N/A N/A 0110 Reserved N/A N/A 0111 Reserved 1000 User Pattern user_patt1 user_patt2 1001 Reserved N/A N/A 1010 Ramp N/A N/A ADDRESS 0XD0: USER_PATT8_MSB These registers define the lower and upper eight bits, respectively, of the user-defined pattern 8 Digital Temperature Sensor ADDRESS 0X4B: TEMP_COUNTER_HIGH Bits [2:0] of this register hold the 3 MSB’s of the 11-bit temperature code. Bit [7] of this register indicates a valid temperature_counter read was performed. A logic ‘1’ indicates a valid read. ADDRESS 0X4C: TEMP_COUNTER_LOW Bits [7:0] of this register hold the lower 8 LSBs of the 11-bit temperature code. ADDRESS 0XC1: USER_PATT1_LSB ADDRESS 0X4D: TEMP_COUNTER_CONTROL ADDRESS 0XC2: USER_PATT1_MSB Bit [7] Measurement mode select bit, set to ‘1’ for recommended PTAT mode. ‘0’ (default) is IPTAT mode and is less accurate and not recommended. These registers define the lower and upper eight bits, respectively, of the user-defined pattern 1. ADDRESS 0XC3: USER_PATT2_LSB ADDRESS 0XC4: USER_PATT2_MSB These registers define the lower and upper eight bits, respectively, of the user-defined pattern 2 ADDRESS 0XC5: USER_PATT3_LSB ADDRESS 0XC6: USER_PATT3_MSB These registers define the lower and upper eight bits, respectively, of the user-defined pattern 3 ADDRESS 0XC7: USER_PATT4_LSB ADDRESS 0XC8: USER_PATT4_MSB These registers define the lower and upper eight bits, respectively, of the user-defined pattern 4. ADDRESS 0XC9: USER_PATT5_LSB ADDRESS 0XCA: USER_PATT5_MSB These registers define the lower and upper eight bits, respectively, of the user-defined pattern 5. ADDRESS 0XCB: USER_PATT6_LSB ADDRESS 0XCC: USER_PATT6_MSB These registers define the lower and upper eight bits, respectively, of the user-defined pattern 6 ADDRESS 0XCD: USER_PATT7_LSB ADDRESS 0XCE: USER_PATT7_MSB These registers define the lower and upper eight bits, respectively, of the user-defined pattern 7. Bit [6] Temperature counter enable bit. Set to ‘1’ to enable. Bit [5] Temperature counter power down bit. Set to ‘1’ to power down temperature counter. Bit [4] Temperature counter reset bit. Set to ‘1’ to reset count. Bit [3:1] Three bit frequency divider field. Sets temperature counter update rate. Update rate is proportional to ADC sample clock rate and divide ratio. A ‘101’ updates the temp counter every ~ 66µs (for 250Msps). Faster updates rates result in lower precision. Bit [0] Select sampler bit. Set to ‘0’. This set of registers provides digital access to an PTAT or IPTAT-based temperature sensor, allowing the system to estimate the temperature of the die, allowing easy access to information that can be used to decide when to recalibrate the A/D as needed. The nominal transfer function of the temperature counter is Codes (in decimal) = 0.56*T(°C) + 618. This corresponds to approximately a 65 LSB increase from -40°C to +85°C. The accuracy of the sensor is approximately ±20% for both slope and starting code offset. A typical temperature measurement can occur as follows: 1. Write ’0xCA’ to address 0x4D - enable temp counter, divide =’101’ 2. Wait >= 132uS (at 250Msps) - longer wait time ensures the sensor completes one valid cycle. 3. Write ‘0x20’ to address 0x4D - power-down, disable temp counter - recommended between measurements. This ensures that the output does not change between MSB and LSB reads. 4. Read address 0x4B (MSBs) 5. Read address 0x4C (LSBs) 6. Record temp code value 7. Write ‘0x20’ to address 0x4D - power-down, disable temp counter Contact the factory for more information if needed. 30 FN7571.1 March 15, 2011 ISLA214P50 I2E Control and Status Device Config/Control DUT Info SPI Config/Control SPI Memory Map Addr. (Hex) Parameter Name 00 port_config Bit 7 (MSB) SDO Active Bit 6 Bit 5 LSB First Soft Reset Bit 4 Bit 3 01 Reserved Reserved 02 burst_end Burst end address [7:0] 03-07 Reserved Reserved Bit 2 Bit 1 Bit 0 (LSB) Mirror (bit5) Mirror (bit6) Mirror (bit7) Def. Value (Hex) 00h 00h 08 chip_id Chip ID # Read only 09 chip_version Chip Version # Read only 0A-0F Reserved Reserved 10-1F Reserved Reserved 20 offset_coarse_adc0 Coarse Offset 21 offset_fine_adc0 Fine Offset 22 gain_coarse_adc0 23 gain_medium_adc0 cal. value cal. value Reserved Coarse Gain cal. value Medium Gain cal. value 24 gain_fine_adc0 25 modes_adc0 Fine Gain 26 offset_coarse_adc1 Coarse Offset 27 offset_fine_adc1 Fine Offset 28 gain_coarse_adc1 29 gain_medium_adc1 Medium Gain cal. value 2A gain_fine_adc1 Fine Gain cal. value 2B modes_adc1 Reserved cal. value Power Down Mode ADC0 [2:0] 000 = Pin Control 001 = Normal Operation 010 = Nap 100 = Sleep Other codes = Reserved cal. value cal. value Reserved Coarse Gain Reserved 2C-2F Reserved 30 I2E_status 31 I2E_control 32 I2E_static_control 00h NOT reset by Soft Reset cal. value Power Down Mode ADC1 [2:0] 000 = Pin Control 001 = Normal Operation 010 = Nap 100 = Sleep Other codes = Reserved 00h NOT reset by Soft Reset Reserved Reserved Enable Notch Filter Disable Offset Low AC RMS Power Low RMS Power Read only Disable Skew Freeze Run 20h Should be set to 1 01h I2E Power Down 03h Reserved, must be set to 0 Skip coarse adj. Reserved must be set to 0 Disable Gain I2E Settled 33-49 Reserved 4A I2E_power_down Reserved 4B temp_counter_high 4C temp_counter_low 4D temp_counter_control 4E-4F Reserved Reserved 50 I2E_rms_power_threshold_lsb RMS Power Threshold, LSBs [7:0] 31 Notch Filter Power Down Temp Counter [10:8] Temp Counter [7:0] Enable PD Reset Read only Read only Divider [2:0] Select 00h 00h FN7571.1 March 15, 2011 ISLA214P50 SPI Memory Map (Continued) Addr. (Hex) DeviceConfig/Control I2E Control and Status 51 Parameter Name Bit 7 (MSB) Bit 6 Bit 5 I2E_rms_power_threshold_ms b Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB) RMS Power Threshold, MSBs [15:8] Def. Value (Hex) 10h 52 I2E_rms_hysteresis RMS Power Hysteresis FFh 53 I2E_ac_rms_power_threshold _lsb AC Power Threshold, LSBs, [7:0] 50h 54 I2E_ac_rms_power_threshold _msb AC Power Threshold, MSBs, [15:8] 00h 10h 55 I2E_ac_rms_hysteresis AC RMS Power Hysteresis 56-5F Reserved Reserved 60 coarse_offset_init Coarse Offset Initialization value 61 fine_offset_init Fine Offset Initialization value 80h 62 medium_gain_init Medium Gain Initialization value 80h 80h 63 fine_gain_init Fine Gain Initialization value 80h 64 sample_time_skew_init Sample Time Skew Initialization value 80h 65-6F Reserved Reserved 70 skew_diff 71 phase_slip Differential Skew 72 clock_divide 73 output_mode_A Output Mode [7:5] 000 =LVDS 3mA (Default) 001 = LVDS 2mA 100 = LVCMOS Other codes = Reserved 74 output_mode_B DLL Range 0 = Fast 1 = Slow (Default = ’0’) Reserved 80h Next Clock Edge 00h Clock Divide [2:0] 000 = Pin Control 001 = divide by 1 010 = divide by 2 Other codes = Reserved 00h NOT reset by Soft Reset Output Format [2:0] 000 = Two’s Complement (Default) 010 = Gray Code 100 = Offset Binary Other codes = Reserved 00h NOT reset by Soft Reset Reserved 00h NOT reset by Soft Reset 75-BF Reserved Reserved A4 dll_ctrl_upper_adc0 Consult Factory cal. value A5 dll_ctrl_lower_adc0 Consult Factory cal. value A6 dll_status_upper_adc0 Consult Factory Read only A7 dll_status_lower_adc0 Consult Factory Read only A8 dll_ctrl_upper_adc1 Consult Factory cal. value A9 dll_ctrl_lower_adc1 Consult Factory cal. value AA dll_status_upper_adc1 Consult Factory Read only AB dll_status_lower_adc1 Consult Factory Read only AC-B5 Reserved Reserved B6 Cal_Status B7-BF Reserved Reserved Calibration Done Read only Reserved 32 FN7571.1 March 15, 2011 ISLA214P50 SPI Memory Map (Continued) Addr. (Hex) Parameter Name C0 test_io Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Output Test Mode (DDR) [7:4] Bit 1 Bit 0 (LSB) User Test Mode(DDR) [2:0] 0 = Off (Note 14) 1 = Midscale Short 2 = +FS Short 3 = -FS Short 4 = Checker Board output - 0xAAAA, 0x5555 DDR 5 = Reserved 6 = Reserved 7 = 0xFFFF,0x0000 all on pattern, DDR Word Toggle 8 = User Pattern (1 to 8 deep,DDR, MSB justified) 9 = Reserved 10 = Ramp 11-15 = Reserved Device Test Bit 2 Def. Value (Hex) 00h 0 = cycle pattern 1 through 2 1 = cycle pattern 1 through 4 2 = cycle pattern 1 through 6 3 = cycle pattern 1 through 8 4-7 =NA C1 user_patt1_lsb B7 B6 B5 B4 B3 B2 B1 B0 00h C2 user_patt1_msb B15 B14 B13 B12 B11 B10 B9 B8 00h C3 user_patt2_lsb B7 B6 B5 B4 B3 B2 B1 B0 00h C4 user_patt2_msb B15 B14 B13 B12 B11 B10 B9 B8 00h C5 user_patt3_lsb B7 B6 B5 B4 B3 B2 B1 B0 00h C6 user_patt3_msb B15 B14 B13 B12 B11 B10 B9 B8 00h C7 user_patt4_lsb B7 B6 B5 B4 B3 B2 B1 B0 00h C8 user_patt4_msb B15 B14 B13 B12 B11 B10 B9 B8 00h C9 user_patt5_lsb B7 B6 B5 B4 B3 B2 B1 B0 00h CA user_patt5_msb B15 B14 B13 B12 B11 B10 B9 B8 00h CB user_patt6_lsb B7 B6 B5 B4 B3 B2 B1 B0 00h CC user_patt6_msb B15 B14 B13 B12 B11 B10 B9 B8 00h CD user_patt7_lsb B7 B6 B5 B4 B3 B2 B1 B0 00h CE user_patt7_msb B15 B14 B13 B12 B11 B10 B9 B8 00h CF user_patt8_lsb B7 B6 B5 B4 B3 B2 B1 B0 00h D0 user_patt8_msb B15 B14 B13 B12 B11 B10 B9 B8 00h LE Active high 00h D1-FD Reserved FE VRAM_latch_enable Reserved FF Reserved Reserved NOTE: 14. During Calibration xCCCC (MSB justified) is presented at the output data bus, toggling on the LSB (and higher) data bits occurs at completion of calibration. This behavior can be used as an option to monitoring Over range to determine calibration state. 33 FN7571.1 March 15, 2011 ISLA214P50 Equivalent Circuits AVDD TO CLOCKPHASE GENERATION AVDD CLKP AVDD CSAMP 9pF TO CHARGE PIPELINE INP 300 Ω E2 E1 E2 AVDD Ω 18kO CLKN E3 FIGURE 43. ANALOG INPUTS FIGURE 44. CLOCK INPUTS AVDD (20k PULL-UP ON RESETN ONLY) AVDD Ω 75kO AVDD 18kO Ω AVDD 11kO Ω TO CHARGE PIPELINE INN E1 11kO Ω E3 CSAMP 9pF AVDD AVDD Ω 75kO OVDD TO SENSE LOGIC Ω 280O INPUT OVDD OVDD 20k INPUT Ω 75kO Ω 75kO TO LOGIC 280 FIGURE 46. DIGITAL INPUTS FIGURE 45. TRI-LEVEL DIGITAL INPUTS OVDD 2mA OR 3mA OVDD DATA DATA OVDD D[13:0]P OVDD OVDD D[13:0]N DATA D[13:0] DATA DATA 2mA OR 3mA FIGURE 47. LVDS OUTPUTS 34 FIGURE 48. CMOS OUTPUTS FN7571.1 March 15, 2011 ISLA214P50 Equivalent Circuits (Continued) AVDD VCM 0.94V + – FIGURE 49. VCM_OUT OUTPUT A/D Evaluation Platform LVDS Outputs Intersil offers an A/D Evaluation platform which can be used to evaluate any of Intersil’s high speed A/D products. The platform consists of a FPGA based data capture motherboard and a family of A/D daughtercards. This USB based platform allows a user to quickly evaluate the A/D’s performance at a user’s specific application frequency requirements. More information is available at http://www.intersil.com/converters/adc_eval_platform/ Output traces and connections must be designed for 50Ω (100Ω differential) characteristic impedance. Keep traces direct and minimize bends where possible. Avoid crossing ground and power-plane breaks with signal traces. Layout Considerations Split Ground and Power Planes Data converters operating at high sampling frequencies require extra care in PC board layout. Many complex board designs benefit from isolating the analog and digital sections. Analog supply and ground planes should be laid out under signal and clock inputs. Locate the digital planes under outputs and logic pins. Grounds should be joined under the chip. Clock Input Considerations Use matched transmission lines to the transformer inputs for the analog input and clock signals. Locate transformers and terminations as close to the chip as possible. Exposed Paddle The exposed paddle must be electrically connected to analog ground (AVSS) and should be connected to a large copper plane using numerous vias for optimal thermal performance. Bypass and Filtering Bulk capacitors should have low equivalent series resistance. Tantalum is a good choice. For best performance, keep ceramic bypass capacitors very close to device pins. Longer traces will increase inductance, resulting in diminished dynamic performance and accuracy. Make sure that connections to ground are direct and low impedance. Avoid forming ground loops. LVCMOS Outputs Output traces and connections must be designed for 50Ω characteristic impedance. Unused Inputs Standard logic inputs (RESETN, CSB, SCLK, SDIO, SDO) which will not be operated do not require connection to ensure optimal A/D performance. These inputs can be left floating if they are not used. Tri-level inputs (NAPSLP) accept a floating input as a valid state, and therefore should be biased according to the desired functionality. Definitions Analog Input Bandwidth is the analog input frequency at which the spectral output power at the fundamental frequency (as determined by FFT analysis) is reduced by 3dB from its full-scale low-frequency value. This is also referred to as Full Power Bandwidth. Aperture Delay or Sampling Delay is the time required after the rise of the clock input for the sampling switch to open, at which time the signal is held for conversion. Aperture Jitter is the RMS variation in aperture delay for a set of samples. Clock Duty Cycle is the ratio of the time the clock wave is at logic high to the total time of one clock period. Differential Non-Linearity (DNL) is the deviation of any code width from an ideal 1 LSB step. Effective Number of Bits (ENOB) is an alternate method of specifying Signal to Noise-and-Distortion Ratio (SINAD). In dB, it is calculated as: ENOB = (SINAD - 1.76)/6.02 Gain Error is the ratio of the difference between the voltages that cause the lowest and highest code transitions to the full-scale voltage less 2 LSB. It is typically expressed in percent. I2E The Intersil Interleave Engine. This highly configurable circuitry performs estimates of offset, gain, and sample time 35 FN7571.1 March 15, 2011 ISLA214P50 skew mismatches between the core converters, and updates analog adjustments for each to minimize interleave spurs. Integral Non-Linearity (INL) is the maximum deviation of the A/D’s transfer function from a best fit line determined by a least squares curve fit of that transfer function, measured in units of LSBs. Least Significant Bit (LSB) is the bit that has the smallest value or weight in a digital word. Its value in terms of input voltage is VFS/(2N-1) where N is the resolution in bits. Missing Codes are output codes that are skipped and will never appear at the A/D output. These codes cannot be reached with any input value. Most Significant Bit (MSB) is the bit that has the largest value or weight. Pipeline Delay is the number of clock cycles between the initiation of a conversion and the appearance at the output pins of the data. Power Supply Rejection Ratio (PSRR) is the ratio of the observed magnitude of a spur in the A/D FFT, caused by an AC signal superimposed on the power supply voltage. Signal to Noise-and-Distortion (SINAD) is the ratio of the RMS signal amplitude to the RMS sum of all other spectral components below one half the clock frequency, including harmonics but excluding DC. Signal-to-Noise Ratio (without Harmonics) is the ratio of the RMS signal amplitude to the RMS sum of all other spectral components below one-half the sampling frequency, excluding harmonics and DC. SNR and SINAD are either given in units of dB when the power of the fundamental is used as the reference, or dBFS (dB to full scale) when the converter’s full-scale input power is used as the reference. Spurious-Free-Dynamic Range (SFDR) is the ratio of the RMS signal amplitude to the RMS value of the largest spurious spectral component. The largest spurious spectral component may or may not be a harmonic. Revision History The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you have the latest Rev. DATE REVISION 3/14/11 FN7571.1 CHANGE Removed coming soon part ISLA214P50IR1Z from ordering information (not being offered). Page 1 Features changed “75fS” to “75fs”. Updated ordering Eval board name from ”ISLA214P50EVAL” to ”ISLA214P50IR72EV1Z” matching Intrepid. Updated Temperature Calibration Curves (see ISLA214P50_CHG History.docx for detailed changes) Added paragraph to “Clock Input” on page 20. 3/1/11 Removed 100% Matte Tin Plate w/Anneal-e3 lead finish note from ordering information due to both parts having NiPdAu plate--e4 termination finish. 2/28/11 Added Note reference to meet new standard in MIN and MAX to I2E Specifications Table on page 11. 2/8/11 FN7571.0 Initial Release Products Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks. Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a complete list of Intersil product families. *For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on intersil.com: ISLA214P50 To report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff FITs are available from our website at: http://rel.intersil.com/reports/sear For additional products, see www.intersil.com/product_tree Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 36 FN7571.1 March 15, 2011 ISLA214P50 Package Outline Drawing L72.10x10E 72 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 0, 11/09 A X 10.00 9.75 72 Z EXPOSED PAD AREA B 6 PIN #1 INDEX AREA 72 1 1 6 PIN 1 INDEX AREA 8.500 REF. (4X) 9.75 3.000 REF. 6.000 REF. 10.00 0.100 M C A B (4X) 0.15 4.150 REF. TOP VIEW 7.150 REF. 0.100 M C A B BOTTOM VIEW 11° ALL AROUND 9.75 ±0.10 Y C0.400X45° (4X) 10.00 ±0.10 (0.350) 0.450 R0.200 SIDE VIEW 25 .1 (0 (4X 9.70) LL A A O R D N ) 1 C0.190X45° (4.15 REF) U (1.500) (7.15) 0.500 ±0.100 72 R0.115 TYP. (3.00 ) (4X 8.50) (6.00) DETAIL "Z" R0.200 MAX. ALL AROUND TYPICAL RECOMMENDED LAND PATTERN NOTES: 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. 2. Dimensioning and tolerancing conform to ANSI Y14.5m-1994. 3. Unless otherwise specified, tolerance : Decimal ± 0.10 Angular ±2.50° 4. Dimension applies to the metallized terminal and is measured between 0.015mm and 0.30mm from the terminal tip. 5. Tiebar shown (if present) is a non-functional feature. 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 indentifier may be 7. Package outline compliant to JESD-M0220. 0.190~0.245 SEATING PLANE 0.080 C 0.50 0.025 ±0.020 0.23 ±0.050 0.85 ±0.050 0.100 C ( 72X 0 .70) 0.650 ±0.050 ( 72X 0 .23) DETAIL "X" C 0.100 M C A B 0.050 M C DETAIL "Y" either a mold or mark feature. 37 FN7571.1 March 15, 2011