AD9821 Analog Devices, AD9821 Datasheet

AD9821

Manufacturer Part Number

AD9821

Description

Complete 12-Bit 40 MSPS Imaging Signal Processor

Manufacturer

Analog Devices

Datasheet

1.AD9821.pdf (16 pages)

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REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices.

FEATURES

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

APPLICATIONS

Digital Still Cameras Using CMOS Imagers

Industrial/Scientific Imaging

BYP1

VIN+

VIN–

AD9821

AVDD

–

SHA

FUNCTIONAL BLOCK DIAGRAM

AVSS

REGISTERS

INTERFACE

INTERNAL

DIGITAL

0dB ~ 36dB

SCK

VGA

SDATA

GENERAL DESCRIPTION

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

REFERENCE

BAND GAP

VRT

BLK CLAMP

Imaging Signal Processor

Complete 12-Bit 40 MSPS

12-BIT

LEVEL

ADC

CLP

VRB

DATACLK

PBLK

DRVDD

DRVSS

DOUT

CLPOB

DVDD

DVSS

AD9821

www.analog.com

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