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AD9821的产品特征：
●Differential Sensor Input with 1 V p-p Input Range
●0 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA)
●Low Noise Optical Black Clamp Circuit
●Analog Preblanking Function
●12-Bit 40 MSPS A/D Converter (ADC)
●3-Wire Serial Digital Interface
●3 V Single-Supply Operation
●Low Power: 150 mW @ 3 V Supply
●48-Lead LQFP Package
AD9821的技术参数：
| Respect |
With Parameter To |
Min | Max | Unit |
| AVDD1, AVDD2 DVDD1, DVDD2 DRVDD Digital Outputs DATACLK CLPOB, PBLK SCK, SL, SDATA VRT, VRB BYP1, VIN Junction Temperature Lead Temperature (10 sec) |
AVSS DVSS DRVSS DRVSS DVSS DVSS DVSS AVSS AVSS |
–0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 |
+3.9 +3.9 +3.9 DRVDD + 0. DVDD + 0.3 DVDD + 0.3 DVDD + 0.3 AVDD + 0.3 AVDD + 0.3 150 300 |
V V V V V V V V V °C °C |
The AD9821 is a complete analog signal processor for imaging applications that do not require Correlated Double Sampling (CDS). It features a 40 MHz single-channel architecture designed
to sample and condition the outputs of CMOS imagers and CCD arrays already containing on-chip CDS. The AD9821’s signal chain consists of a differential input sample-and-hold amplifier
(SHA), digitally controlled variable gain amplifier (VGA), black level clamp, and a 12-bit ADC.
The internal registers are programmed through a 3-wire serial digital interface. Programmable features include gain adjust- ment, black level adjustment, and power-down modes. The AD9821 operates from a single 3 V power supply, typically dissipates 150 mW, and is packaged in a 48-lead LQFP.