May 18, 2010 12-Bit, Single 3.6 GSPS ADC 1.0 General Description 3.0 Features The 12-bit, 3.6 GSPS ADC12D1800 is the latest advance in National's Ultra-High-Speed ADC family and builds upon the features, architecture and functionality of the 10-bit GHz family of ADCs. ■ Configurable to either 3.6 GSPS interleaved or 1.8 GSPS The ADC12D1800 provides a flexible LVDS interface which has multiple SPI programmable options to facilitate board design and FPGA/ASIC data capture. The LVDS outputs are compatible with IEEE 1596.3-1996 and supports programmable common mode voltage. ■ ■ ■ ■ ■ ■ ■ ■ The product is packaged in a leaded or lead-free 292-ball thermally enhanced BGA package over the rated industrial temperature range of -40°C to +85°C. Notice: This document is not a full datasheet. For more information regarding this product or to order samples please contact your local National Semiconductor sales office or visit http://www.national.com/support/dir.html ADC12D1000/1600 Internally terminated, buffered, differential analog inputs Interleaved timing automatic and manual skew adjust Test patterns at output for system debug Programmable 15-bit gain and 12-bit plus sign offset Programmable tAD adjust feature 1:1 non-demuxed or 1:2 demuxed LVDS outputs AutoSync feature for multi-chip systems Single power supply 4.0 Key Specifications ■ Resolution 12 Bits Interleaved 3.6 GSPS ADC ■ Noise Floor ■ IMD3 ■ Noise Power Ratio ■ Power ■ Full Power Bandwidth 2.0 Applications ■ ■ ■ ■ ■ ■ dual ADC ■ Pin-compatible with ADC10D1000/1500 and Wideband Communications Data Acquisition Systems RADAR/LIDAR Set-top Box Consumer RF Software Defined Radio -147 dBm/Hz (typ) -61 dBFS (typ) 52 dB (typ) 4.1W (typ) 2.15 GHz (typ) Dual 1.8 GSPS ADC, Fin = 125MHz ■ ENOB ■ SNR ■ SFDR ■ Power ■ Full Power Bandwidth 9.2 (typ) 57.8 dB (typ) 67 dBc (typ) 4.1W (typ) 2.8 GHz (typ) 5.0 Block Diagram 30123211 © 2010 National Semiconductor Corporation 301232 www.national.com ADC12D1800 PRODUCT BRIEF PRELIMINARY ADC12D1800 PRODUCT BRIEF ADC12D1800 6.0 Wideband Performance 30123298 7.0 Ordering Information Industrial Temperature Range (-40°C < TA < +85°C) NS Package ADC12D1800CIUT/NOPB Lead-free 292-Ball BGA Thermally Enhanced Package ADC12D1800CIUT Leaded 292-Ball BGA Thermally Enhanced Package ADC12D1800RB Reference Board If Military/Aerospace specified devices are required, please contract the National Semiconductor Sales Office/Distributors for availability and specifications. IBIS models are available at: http://www.national.com/analog/adc/ibis_models. www.national.com 2 ADC12D1800 8.0 Connection Diagram 30123201 FIGURE 1. ADC12D1800 Connection Diagram The center ground pins are for thermal dissipation and must be soldered to a ground plane to ensure rated performance. 3 www.national.com ADC12D1800 9.0 Ball Descriptions and Equivalent Circuits TABLE 1. Analog Front-End and Clock Balls Ball No. Name H1/J1 N1/M1 VinI+/VinQ+/- U2/V1 V2/W1 www.national.com Equivalent Circuit Description Differential signal I- and Q-inputs. In the Non-Dual Edge Sampling (Non-DES) Mode, each I- and Q-input is sampled and converted by its respective channel with each positive transition of the CLK input. In Non-ECM (Non-Extended Control Mode) and DES Mode, both channels sample the I-input. In Extended Control Mode (ECM), the Qinput may optionally be selected for conversion in DES Mode by the DEQ Bit (Addr: 0h, Bit 6). Each I- and Q-channel input has an internal common mode bias that is disabled when DC-coupled Mode is selected. Both inputs must be either AC- or DC-coupled. The coupling mode is selected by the VCMO Pin. In Non-ECM, the full-scale range of these inputs is determined by the FSR Pin; both I- and Qchannels have the same full-scale input range. In ECM, the full-scale input range of the I- and Qchannel inputs may be independently set via the Control Register (Addr: 3h and Addr: Bh). Note that the high and low full-scale input range setting in Non-ECM corresponds to the mid and minimum full-scale input range in ECM. The input offset may also be adjusted in ECM. CLK+/- Differential Converter Sampling Clock. In the Non-DES Mode, the analog inputs are sampled on the positive transitions of this clock signal. In the DES Mode, the selected input is sampled on both transitions of this clock. This clock must be AC-coupled. DCLK_RST+/- Differential DCLK Reset. A positive pulse on this input is used to reset the DCLKI and DCLKQ outputs of two or more ADC12D1800s in order to synchronize them with other ADC12D1800s in the system. DCLKI and DCLKQ are always in phase with each other, unless one channel is powered down, and do not require a pulse from DCLK_RST to become synchronized. The pulse applied here must meet timing relationships with respect to the CLK input. Although supported, this feature has been superseded by AutoSync. 4 C2 B1 C3/D3 C1/D2 E2/F3 Name Equivalent Circuit Description VCMO Common Mode Voltage Output or Signal Coupling Select. If AC-coupled operation at the analog inputs is desired, this pin should be held at logic-low level. This pin is capable of sourcing/ sinking up to 100 µA. For DC-coupled operation, this pin should be left floating or terminated into high-impedance. In DC-coupled Mode, this pin provides an output voltage which is the optimal common-mode voltage for the input signal and should be used to set the common-mode voltage of the driving buffer. VBG Bandgap Voltage Output or LVDS Commonmode Voltage Select. This pin provides a buffered version of the bandgap output voltage and is capable of sourcing/sinking 100 uA and driving a load of up to 80 pF. Alternately, this pin may be used to select the LVDS digital output common-mode voltage. If tied to logic-high, the 1.2V LVDS common-mode voltage is selected; 0.8V is the default. Rext+/- External Reference Resistor terminals. A 3.3 kΩ ±0.1% resistor should be connected between Rext+/-. The Rext resistor is used as a reference to trim internal circuits which affect the linearity of the converter; the value and precision of this resistor should not be compromised. Rtrim+/- Input Termination Trim Resistor terminals. A 3.3 kΩ ±0.1% resistor should be connected between Rtrim+/-. The Rtrim resistor is used to establish the calibrated 100Ω input impedance of VinI, VinQ and CLK. These impedances may be fine tuned by varying the value of the resistor by a corresponding percentage; however, the tuning range and performance is not guaranteed for such an alternate value. Tdiode+/- Temperature Sensor Diode Positive (Anode) and Negative (Cathode) Terminals. This set of pins is used for die temperature measurements. It has not been fully characterized. 5 www.national.com ADC12D1800 Ball No. ADC12D1800 Ball No. Y4/W5 Y5/U6 V6/V7 www.national.com Name Equivalent Circuit Description RCLK+/- Reference Clock Input. When the AutoSync feature is active, and the ADC12D1800 is in Slave Mode, the internal divided clocks are synchronized with respect to this input clock. The delay on this clock may be adjusted when synchronizing multiple ADCs. This feature is available in ECM via Control Register (Addr: Eh). RCOut1+/RCOut2+/- Reference Clock Output 1 and 2. These signals provide a reference clock at a rate of CLK/4, when enabled, independently of whether the ADC is in Master or Slave Mode. They are used to drive the RCLK of another ADC12D1800, to enable automatic synchronization for multiple ADCs (AutoSync feature). The impedance of each trace from RCOut1 and RCOut2 to the RCLK of another ADC12D1800 should be 100Ω differential. Having two clock outputs allows the auto-synchronization to propagate as a binary tree. Use the DOC Bit (Addr: Eh, Bit 1) to enable/ disable this feature; default is disabled. 6 Ball No. Name Equivalent Circuit Description DES Dual Edge Sampling (DES) Mode select. In the Non-Extended Control Mode (Non-ECM), when this input is set to logic-high, the DES Mode of operation is selected, meaning that the VinI input is sampled by both channels in a time-interleaved manner. The VinQ input is ignored. When this input is set to logic-low, the device is in Non-DES Mode, i.e. the I- and Q-channels operate independently. In the Extended Control Mode (ECM), this input is ignored and DES Mode selection is controlled through the Control Register by the DES Bit (Addr: 0h, Bit 7); default is Non-DES Mode operation. CalDly Calibration Delay select. By setting this input logic-high or logic-low, the user can select the device to wait a longer or shorter amount of time, respectively, before the automatic power-on selfcalibration is initiated. This feature is pincontrolled only and is always active during ECM and Non-ECM. D6 CAL Calibration cycle initiate. The user can command the device to execute a self-calibration cycle by holding this input high a minimum of tCAL_H after having held it low a minimum of tCAL_L. If this input is held high at the time of power-on, the automatic power-on calibration cycle is inhibited until this input is cycled low-then-high. This pin is active in both ECM and Non-ECM. In ECM, this pin is logically OR'd with the CAL Bit (Addr: 0h, Bit 15) in the Control Register. Therefore, both pin and bit must be set low and then either can be set high to execute an on-command calibration. B5 CalRun V5 V4 Calibration Running indication. This output is logic-high while the calibration sequence is executing. This output is logic-low otherwise. 7 www.national.com ADC12D1800 TABLE 2. Control and Status Balls ADC12D1800 Ball No. U3 V3 A4 A5 Name Description PDI PDQ Power Down I- and Q-channel. Setting either input to logic-high powers down the respective Ior Q-channel. Setting either input to logic-low brings the respective I- or Q-channel to a operational state after a finite time delay. This pin is active in both ECM and Non-ECM. In ECM, each Pin is logically OR'd with its respective Bit. Therefore, either this pin or the PDI and PDQ Bit in the Control Register can be used to powerdown the I- and Q-channel (Addr: 0h, Bit 11 and Bit 10), respectively. TPM Test Pattern Mode select. With this input at logichigh, the device continuously outputs a fixed, repetitive test pattern at the digital outputs. In the ECM, this input is ignored and the Test Pattern Mode can only be activated through the Control Register by the TPM Bit (Addr: 0h, Bit 12). NDM Non-Demuxed Mode select. Setting this input to logic-high causes the digital output bus to be in the 1:1 Non-Demuxed Mode. Setting this input to logic-low causes the digital output bus to be in the 1:2 Demuxed Mode. This feature is pin-controlled only and remains active during ECM and NonECM. Y3 FSR W4 DDRPh www.national.com Equivalent Circuit Full-Scale input Range select. In Non-ECM, when this input is set to logic-low or logic-high, the full-scale differential input range for both Iand Q-channel inputs is set to the lower or higher FSR value, respectively. In the ECM, this input is ignored and the full-scale range of the I- and Qchannel inputs is independently determined by the setting of Addr: 3h and Addr: Bh, respectively. Note that the high (lower) FSR value in NonECM corresponds to the mid (min) available selection in ECM; the FSR range in ECM is greater. DDR Phase select. This input, when logic-low, selects the 0° Data-to-DCLK phase relationship. When logic-high, it selects the 90° Data-to-DCLK phase relationship, i.e. the DCLK transition indicates the middle of the valid data outputs. This pin only has an effect when the chip is in 1:2 Demuxed Mode, i.e. the NDM pin is set to logiclow. In ECM, this input is ignored and the DDR phase is selected through the Control Register by the DPS Bit (Addr: 0h, Bit 14); the default is 0° Mode. 8 Name Equivalent Circuit Description ECE Extended Control Enable bar. Extended feature control through the SPI interface is enabled when this signal is asserted (logic-low). In this case, most of the direct control pins have no effect. When this signal is de-asserted (logic-high), the SPI interface is disabled, all SPI registers are reset to their default values, and all available settings are controlled via the control pins. SCS Serial Chip Select bar. In ECM, when this signal is asserted (logic-low), SCLK is used to clock in serial data which is present on SDI and to source serial data on SDO. When this signal is deasserted (logic-high), SDI is ignored and SDO is in tri-stated. C5 SCLK Serial Clock. In ECM, serial data is shifted into and out of the device synchronously to this clock signal. This clock may be disabled and held logiclow, as long as timing specifications are not violated when the clock is enabled or disabled. B4 SDI Serial Data-In. In ECM, serial data is shifted into the device on this pin while SCS signal is asserted (logic-low). A3 SDO Serial Data-Out. In ECM, serial data is shifted out of the device on this pin while SCS signal is asserted (logic-low). This output is tri-stated when SCS is de-asserted. D1, D7, E3, F4, W3, U7 DNC NONE Do Not Connect. These pins are used for internal purposes and should not be connected, i.e. left floating. Do not ground. C7 NC NONE Not Connected. This pin is not bonded and may be left floating or connected to any potential. B3 C4 9 www.national.com ADC12D1800 Ball No. ADC12D1800 TABLE 3. Power and Ground Balls Ball No. Name Equivalent Circuit A2, A6, B6, C6, D8, D9, E1, F1, H4, N4, R1, T1, U8, U9, W6, Y2, Y6 VA NONE Power Supply for the Analog circuitry. This supply is tied to the ESD ring. Therefore, it must be powered up before or with any other supply. G1, G3, G4, H2, J3, K3, L3, M3, N2, P1, P3, P4, R3, R4 VTC NONE Power Supply for the Track-and-Hold and Clock circuitry. A11, A15, C18, D11, D15, D17, J17, J20, R17, R20, T17, U11, U15, U16, Y11, Y15 VDR NONE Power Supply for the Output Drivers. A8, B9, C8, V8, W9, Y8 VE NONE Power Supply for the Digital Encoder. NONE Bias Voltage I-channel. This is an externally decoupled bias voltage for the I-channel. Each pin should individually be decoupled with a 100 nF capacitor via a low resistance, low inductance path to GND. J4, K2 VbiasI Description L2, M4 VbiasQ NONE Bias Voltage Q-channel. This is an externally decoupled bias voltage for the Q-channel. Each pin should individually be decoupled with a 100 nF capacitor via a low resistance, low inductance path to GND. A1, A7, B2, B7, D4, D5, E4, K1, L1, T4, U4, U5, W2, W7, Y1, Y7, H8:N13 GND NONE Ground Return for the Analog circuitry. F2, G2, H3, J2, K4, L4, M2, N3, P2, R2, T2, T3, U1 GNDTC NONE Ground Return for the Track-and-Hold and Clock circuitry. A13, A17, A20, D13, D16, E17, F17, F20, M17, M20, U13, U17, V18, Y13, Y17, Y20 GNDDR NONE Ground Return for the Output Drivers. A9, B8, C9, V9, W8, Y9 GNDE NONE Ground Return for the Digital Encoder. www.national.com 10 ADC12D1800 TABLE 4. High-Speed Digital Outputs Ball No. K19/K20 L19/L20 K17/K18 L17/L18 Name Equivalent Circuit Description DCLKI+/DCLKQ+/- Data Clock Output for the I- and Q-channel data bus. These differential clock outputs are used to latch the output data and, if used, should always be terminated with a 100Ω differential resistor placed as closely as possible to the differential receiver. Delayed and non-delayed data outputs are supplied synchronously to this signal. In 1:2 Demux Mode or Non-Demux Mode, this signal is at ¼ or ½ the sampling clock rate, respectively. DCLKI and DCLKQ are always in phase with each other, unless one channel is powered down, and do not require a pulse from DCLK_RST to become synchronized. ORI+/ORQ+/- Out-of-Range Output for the I- and Q-channel. This differential output is asserted logic-high while the over- or under-range condition exists, i.e. the differential signal at each respective analog input exceeds the full-scale value. Each OR result refers to the current Data, with which it is clocked out. If used, each of these outputs should always be terminated with a 100Ω differential resistor placed as closely as possible to the differential receiver. 11 www.national.com ADC12D1800 Ball No. Name J18/J19 H19/H20 H17/H18 G19/G20 G17/G18 F18/F19 E19/E20 D19/D20 D18/E18 C19/C20 B19/B20 B18/C17 · M18/M19 N19/N20 N17/N18 P19/P20 P17/P18 R18/R19 T19/T20 U19/U20 U18/T18 V19/V20 W19/W20 W18/V17 DI11+/DI10+/DI9+/DI8+/DI7+/DI6+/DI5+/DI4+/DI3+/DI2+/DI1+/DI0+/· DQ11+/DQ10+/DQ9+/DQ8+/DQ7+/DQ6+/DQ5+/DQ4+/DQ3+/DQ2+/DQ1+/DQ0+/- I- and Q-channel Digital Data Outputs. In NonDemux Mode, this LVDS data is transmitted at the sampling clock rate. In Demux Mode, these outputs provide ½ the data at ½ the sampling clock rate, synchronized with the delayed data, i.e. the other ½ of the data which was sampled one clock cycle earlier. Compared with the DId and DQd outputs, these outputs represent the later time samples. If used, each of these outputs should always be terminated with a 100Ω differential resistor placed as closely as possible to the differential receiver. A18/A19 B17/C16 A16/B16 B15/C15 C14/D14 A14/B14 B13/C13 C12/D12 A12/B12 B11/C11 C10/D10 A10/B10 · Y18/Y19 W17/V16 Y16/W16 W15/V15 V14/U14 Y14/W14 W13/V13 V12/U12 Y12/W12 W11/V11 V10/U10 Y10/W10 DId11+/DId10+/DId9+/DId8+/DId7+/DId6+/DId5+/DId4+/DId3+/DId2+/DId1+/DId0+/· DQd11+/DQd10+/DQd9+/DQd8+/DQd7+/DQd6+/DQd5+/DQd4+/DQd3+/DQd2+/DQd1+/DQd0+/- Delayed I- and Q-channel Digital Data Outputs. In Non-Demux Mode, these outputs are tristated. In Demux Mode, these outputs provide ½ the data at ½ the sampling clock rate, synchronized with the non-delayed data, i.e. the other ½ of the data which was sampled one clock cycle later. Compared with the DI and DQ outputs, these outputs represent the earlier time samples. If used, each of these outputs should always be terminated with a 100Ω differential resistor placed as closely as possible to the differential receiver. www.national.com Equivalent Circuit 12 Description ADC12D1800 10.0 Physical Dimensions inches (millimeters) unless otherwise noted NOTES: UNLESS OTHERWISE SPECIFIED REFERENCE JEDEC REGISTRATION MS-034, VARIATION BAL-2. 292-Ball BGA Thermally Enhanced Package Order Number ADC12D1800CUIT NS Package Number UFH292A 13 www.national.com ADC12D1800 PRODUCT BRIEF Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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