AD9845B| Datasheet

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Complete 12-Bit 30 MSPS CCD Signal Processor AD9845B
FEATURES Pin Compatible with AD9845A Designs 12-Bit 30 MSPS A/D Converter 30 MSPS Correlated Double Sampler (CDS) 4 dB 6 dB 6-Bit Pixel Gain Amplifier (PxGA ) 2 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA) Low Noise Clamp Circuits Preblanking Function Auxiliary Inputs with VGA and Input Clamp 3-Wire Serial Digital Interface 3 V Single-Supply Operation Low Power: 153 mW @ 3 V Supply Space-Saving 48-Lead LQFP Package APPLICATIONS High Performance Digital Still Cameras Industrial/Scientific Imaging GENERAL DESCRIPTION

The AD9845B is an improved version of the AD9845A CCD signal processor. It features a 30 MHz single-channel architecture designed to sample and condition the outputs of interlaced and progressive scan area CCD arrays. The AD9845B's signal chain consists of an input clamp, a correlated double sampler (CDS), PxGA, a digitally controlled VGA, a black level clamp, and a 12-bit A/D converter. Additional input modes are also provided for processing analog video signals. The internal registers are programmed through a 3-wire serial digital interface. Programmable features include gain adjustment, black level adjustment, input configuration, and power-down modes. The AD9845B operates from a single 3 V power supply, typically dissipates 153 mW, and is packaged in a 48-lead LQFP.

FUNCTIONAL BLOCK DIAGRAM

AVDD

AVSS

VRT

VRB

PBLK

4dB CCDIN CDS

6dB PxGA

COLOR STEERING 2dB~36dB 2:1 MUX

BAND GAP REFERENCE

DRVDD DRVSS 12

VGA

ADC

DOUT

CLP 6 CLPDM 10 AUX1IN 2:1 MUX AUX2IN CLP CONTROL REGISTERS BUF 8 BLK CLAMP LEVEL CLPOB CLP

DVDD

AD9845B

DIGITAL INTERFACE

INTERNAL TIMING

DVSS

SCK

SDATA

SHP

SHD

DATACLK

REV.B
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