Complete 10-Bit and 12-Bit, 25 MHz

CCD Signal Processors

Data Sheet

AD9943/AD9944

FEATURES

25 MSPS correlated double sampler (CDS)

6 dB to 40 dB 10-bit variable gain amplifier (VGA)

Low noise optical black clamp circuit

Preblanking function

10-bit (AD9943), 12-bit (AD9944) 25 MSPS A/D converter

No missing codes guaranteed

3-wire serial digital interface

3 V single-supply operation

Space-saving 32-lead 5 mm × 5 mm LFCSP package

APPLICATIONS

Digital still cameras

Digital video camcorders

PC cameras

Portable CCD imaging devices

CCTV cameras

GENERAL DESCRIPTION

The AD9943/AD9944 are complete analog signal processors

for CCD applications. They feature a 25 MHz single-channel

architecture designed to sample and condition the outputs of

interlaced and progressive scan area CCD arrays. The signal

chain for the AD9943/AD9944 consists of a correlated double

sampler (CDS), a digitally controlled variable gain amplifier

(VGA), and a black level clamp. The AD9943 offers 10-bit

ADC resolution, while the AD9944 contains a true 12-bit ADC.

The internal registers are programmed through a 3-wire

serial digital interface. Programmable features include gain

adjustment, black level adjustment, input clock polarity, and

power-down modes. The AD9943/AD9944 operate from a

single 3 V power supply, typically dissipate 79 mW, and are

packaged in space-saving 32-lead LFCSP packages.

FUNCTIONAL BLOCK DIAGRAM

Figure 1. Functional Block Diagram

DATACLK

SHD

SHP

BAND GAP

REFERENCE

DOUT

CCDIN

PBLK

REFT

REFB

INTERNAL

TIMING

6dB–40dB

AVDD

DVDD

DVSS

AVSS

DRVDD

DRVSS

10

DIGITAL

INTERFACE

SDATA

SCK

SL

CLPOB

10/12

CDS

VGA

CLP

AD9943/AD9944

CONTROL

REGISTERS

10-/12-BIT

ADC

Rev. C

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