ADC-228A 8-Bit, 20MHz, Complete Flash A/D Converter PRODUCT OVERVIEW The ADC-228A combines analog front-end circuitry and a flash A/D converter to digitize high-speed analog signals at a rate of 20 million samples per second. The ADC-228A contains an 8-bit, 20MHz, flash A/D, a wideband analog input buffer, a precision voltage reference, temperature compensation circuitry, reference trims, and a three-state output buffer in a 24-pin package. The ADC-228A offers significant savings by combining all of the circuitry in a single package. Valuable board real estate is saved, and design time and manufacturing costs are reduced. The ADC-228A is housed in a 24-pin ceramic DDIP package and is available in the commercial (0 to +70°C), industrial (–40 to +100°C), or military (–55 to +125°C) temperature ranges. A MIL-STD-883 version is also available. Operation is from ±15V and +5V power supplies. INPUT/OUTPUT CONNECTIONS FUNCTION Pin +5V SUPPLY 24 Pin 1 FUNCTION BIT 8 (LSB) FEATURES 2 GROUND 23 3 +5V REFERENCE OUT 22 BIT 6 8-Bit flash A/D converter 4 GROUND 21 BIT 5 20MHz sampling rate 5 ANALOG INPUT 20 NO CONNECTION 6 GROUND 19 +15V SUPPLY 7 GROUND 18 CLOCK INPUT Low power, 900mW 8 NO CONNECTION 17 BIT 4 Sample-hold not required 9 NO CONNECTION 16 BIT 3 10 –15V SUPPLY 15 BIT 2 11 CS1 14 BIT 1 (MSB) 12 CS2 13 NO CONNECTION Complete support circuitry Three-state outputs MIL-STD-883 versions BIT 7 CS1 11 13 NO CONNECTION CS2 12 NO CONNECTION 8 NO CONNECTION 9 CLOCK 18 20 NO CONNECTION 14 BIT 1 (MSB) ANALOG INPUT 5 INPUT BUFFER +15V SUPPLY 19 –15V SUPPLY 10 LINEARIZATION & TEMPERATURE COMPENSATION NETWORK 15 BIT 2 16 BIT 3 8-BIT 20MHz FLASH CONVERTER TRI-STATE BUFFER 22 BIT 6 23 BIT 7 24 BIT 8 (LSB) GROUND 7 GROUND 6 GROUND 4 GROUND 2 17 BIT 4 21 BIT 5 3 +5V REF. OUT VOLTAGE REFERENCE NETWORK +5V SUPPLY 1 Figure 1. Functional Block Diagram DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] ADC-228A.B04 Page 1 of 4 ADC-228A 8-Bit, 20MHz, Complete Flash A/D Converter ABSOLUTE MAXIMUM RATINGS LIMITS Pin 1 –0.3 to +7V Pin 19 –0.3 to +18V Pin 10 +0.3 to –18V Digital Inputs, Pins 8, 9, 11, 12, 18 –0.5 to +5.5V Analog Input, Pin 5 –3.8 to +6.6V –0.5 to +5.5V Digital Outputs (short circuit protected to ground) Lead Temp. (10 seconds) +300°C PARAMETER Power Supply Voltage, FUNCTIONAL SPECIFICATIONS (Apply over the operating temperature range with 20MHz clock and ±15V and +5V power supply voltages, unless otherwise specified.) ANALOG INPUTS Single-Ended, Non-Isolated Input Range, dc-20MHz Input Resistance Input Capacitance MIN. TYP. MAX. UNITS 0 1.95 — — 2 5 +5.0 — 10 Volts kΩ pF +2.0 — — — — +0.8 Volts Volts — — — — +160 –0.5 μA mA 20 20 — — — — ns ns DIGITAL INPUTS Logic Levels Logic 1 Logic 0 Logic Loading Logic 1 Logic 0 Clock Pulse Widths "High" "Low" DIGITAL OUTPUTS Coding Resolution Logic Levels Logic 1 Logic 0 Logic Loading Logic 1 Logic 0 Output Data Valid Delay From Rising Edge Output Hold Time Straight Binary 8 Bits +2.4 — — — — +0.4 Volts Volts — — — — –1 +1 mA mA — 6 — — 40 — ns ns — — MHz ±0.5 ±0.5 ±0.5 ±0.75 ±0.75 ±0.85 LSB LSB LSB ±0.5 ±0.35 — — ±1 ±0.75 ±1.75 ±1 LSB LSB LSB LSB ±0.5 ±0.5 ±1 ±1.5 LSB LSB PERFORMANCE Sampling Rate ➀ 20 Differential Linearity Code Transitions +25°C — 0 to +70°C — –55 to +125°C — Integral Linearity, +25°C End-point — Best-fit Line — Over Temperature End-point — Best-fit Line — Zero-Scale Offset Code "0" to "1" Transition +25°C — –55 to +125°C — DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA PERFORMANCE Gain error Full Scale Absolute Accuracy Differential Gain ➁ Differential Phase ➁ Aperture Delay Aperture Jitter No Missing Codes MIN. — — — — — — TYP. ±0.5 ±0.5 2 1 8 50 MAX. ±1.5 ±1.5 — — — — UNITS LSB LSB % deg. ns ps Over the operating temperature range ±0.02% FSR/%VS maximum DYNAMIC PERFORMANCE Total Harm. Distortion, –0.5dB DC to 2.5 MHz — –55 –53 dB 2.5 MHz to 5 MHz — –49 –44 dB 5 MHz to 10 MHz — –39 –36 dB Signal-to-Noise Ratio and Distortion, –0.5dB DC to 2.5 MHz 44 49 — dB 2.5 MHz to 5 MHz 41 46 — dB 5 MHz to 10 MHz 35 38 — dB Signal-to-Noise Ratio w/o Distortion, –0.5 dB DC to 2.5 MHz 45 48 — dB 2.5 MHz to 5 MHz 44 49 — dB 5 MHz to 10 MHz 42 45 — dB Effective Bits, –0.5dB DC to 2.5 MHz 7.1 7.75 — Bits 2.5 MHz to 5 MHz 6.8 7.4 — Bits 5 MHz to 10 MHz 5.6 6.1 — Bits Input Bandwidth Large Signal (–3dB) 15 — — MHz Small Signal (–20dB) 40 — — MHz Power Supply Rejection POWER SUPPLY Power Supply Range +15V Supply –15V Supply +5V Supply Power Supply Current +15V Supply –15V Supply +5V Supply Power Dissipation ±15V, +5V Nominal +11 –11 +4.75 +15 –15 +5 +15.75 –15.75 +5.25 Volts Volts Volts — — — +12 –13 +70 +20 –20 +80 mA mA mA — 0.7 0.9 PHYSICAL/ENVIRONMENTAL Operating Temp. Range, Case ADC-228AMC, ADC-228AMC-C 0 to +70°C ADC-228AME, ADC-228AME-C –40 to +100°C ADC-228AMM, ADC-228AMM-C –55 to +125°C ADC-228A/883, ADC-228A/883-C –55 to +125°C Storage Temp. Range –65 to +150°C Package Type 24-pin, ceramic DDIP Weight 0.42 ounces (12 grams) Watts Footnotes: ➀ At full power input and chip selects enabled. ➁ For 10-step, 40 IRE NTSC ramp test. • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] ADC-228A.B04 Page 2 of 4 ADC-228A 8-Bit, 20MHz, Complete Flash A/D Converter TECHNICAL NOTES 1. Rated performance requires using good high-frequency techniques. The analog and digital ground pins are connected to each other internally. Avoid ground related problems by connecting the grounds to one point, the ground plane beneath the converter. Due to the inductance and resistance of the power supply return paths, return the analog and digital ground separately to the power supplies. 2. Bypass all the analog and digital supplies and the +5V REFERENCE (pin 3) to ground with a 4.7μF, 25V tantalum electrolytic capacitor in parallel with a 0.1μF ceramic capacitor. Table 2. Chip Select Truth Table Table 1. ADC-228A Unipolar Output Coding ANALOG INPUT CODE STRAIGHT BIN. +4.96V +FS – 1 LSB 1111 1110 +3.75V + 3/4 FS 1100 0000 +2.50V + 1/2 FS 1000 0000 +1.25V + 1/4 FS 0100 0000 +0.02V + 1 LSB 0000 0001 0.00V ZERO 0000 0000 CS1 Pin 11 Bits 1-8 0 0 Three State Mode 0 1 Three State Mode 1 0 Data Outputted 1 1 Three State Mode SAMPLE N+1 SAMPLE N CLOCK CS2 Pin 12 SAMPLE N+2 OUTPUT DELAY DATA N DIGITAL OUTPUT DATA N+2 DATA N+1 OUTPUT HOLD TIME Figure 2. ADC-228A Timing Diagram +5V –15V 1 10 + + 14 15 16 17 21 CS1 11 ADC-228A 22 CS1 12 23 24 CLOCK 18 ANALOG INPUT B1 (MSB) B2 B3 B4 B5 B6 B7 B8 (LSB) 8, 9, 13, 20 VIN 5 NO CONNECTION 3 +5V REFERENCE OUT 51Ω 19 9kΩ 2, 4, 6, 7 + *Optional * Use optional resistor only if amp is not used to drive input. R = VEE /1.667mA + +15V Figure 3. ADC-228A Typical Connections DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] ADC-228A.B04 Page 3 of 4 ADC-228A 8-Bit, 20MHz, Complete Flash A/D Converter 1.31 MAX. (33.27) 24 Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) 13 0.80 MAX. (20.32) 1 Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 12 0.100 TYP. (2.540) 1.100 (27.940) 0.235 MAX. (5.969) 0.200 MAX. (5.080) +0.002 0.010 –0.001 (0.254) 0.190 MAX. (4.826) 0.100 (2.540) 0.018 ±0.002 (0.457) 0.040 (1.016) 0.600 ±0.010 (15.240) SEATING PLANE 0.025 (0.635) 0.100 (2.540) ORDERING INFORMATION MODEL NUMBER ADC-228AMC ADC-228AMC-C ADC-228AME ADC-228AME-C ADC-228AMM ADC-228AMM-C ADC-228A/883 ADC-228A/883-C OPERATING TEMP RANGE 0 to +70°C 0 to +70°C –40 to +100°C –40 to +100°C –55 to +125°C –55 to +125°C –55 to +125°C –55 to +125°C PACKAGE DIP DIP DIP DIP DIP DIP DIP DIP RoHS No Yes No Yes No Yes No Yes Receptacle for PC board mounting can be ordered through AMP Inc., part # 3-331272-8 (component lead socket), 24 required. Contact DATEL for 883 product specifications *DATEL's initial qualification was done at 15MSPS and as a Mil-STD-883 Class G product per customer request. MilSTD-883 Class G allows for a reduced temperature range (–55°C to +105°C) that applies to this device. Contact DATEL if a 20MSPS rate or a Mil-STD-883 Class H (–55°C to +125°C) temperature range is desired. DATEL is a registered trademark of DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA DATEL, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. ITAR and ISO 9001/14001 REGISTERED © 2015 DATEL, Inc. www.datel.com • e-mail: [email protected] ADC-228A.B04 Page 4 of 4