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REV. A

a

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.

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

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

AD9891/AD9895

CCD Signal Processors with

Precision Timing™ Generator

PxGA is a registered trademark and Precision Timing is a trademark of Analog Devices, Inc.

FEATURES

AD9891: 10-Bit 20 MHz Version

AD9895: 12-Bit 30 MHz Version

Correlated Double Sampler (CDS)

4

6 dB Pixel Gain Amplifier (

PxGA®)

2 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA)

10-Bit 20 MHz A/D Converter (AD9891)

12-Bit 30 MHz A/D Converter (AD9895)

Black Level Clamp with Variable Level Control

Complete On-Chip Timing Generator

Precision Timing Core with 1 ns Resolution

On-Chip 5 V Horizontal and RG Drivers

2-Phase and 4-Phase H-Clock Modes

4-Phase Vertical Transfer Clocks

Electronic and Mechanical Shutter Modes

On-Chip Driver for External Crystal

On-Chip Sync Generator with External Sync Option

64-Lead CSPBGA Package

APPLICATIONS

Digital Still Cameras

Digital Video Camcorders

Industrial Imaging

FUNCTIONAL BLOCK DIAGRAM

AD9891/AD9895

PxGA

CDS

CLAMP

VGA

CLAMP

ADC

10 OR 12

DCLK

CLPOB/PBLK

FD/LD

MSHUT

STROBE

CLO

CLI

DOUT

VREF

2dB TO 36dB

HORIZONTAL

DRIVERS

V-H

CONTROL

4

8

RG

H1–H4

V1–V4

VSG1–VSG8

VRT

VRB

PRECISION

TIMING

GENERATOR

SYNC

GENERATOR

INTERNAL CLOCKS

VSUB SUBCK

HD

VD SYNC

INTERNAL

REGISTERS

SL

SCK DATA

CCDIN

4dB

6dB

PRODUCT DESCRIPTION

The AD9891 and AD9895 are highly integrated CCD signal

processors for digital still camera applications. Both include a

complete analog front end with A/D conversion combined with

a full-function programmable timing generator. A Precision

Timing core allows adjustment of high speed clocks with 1 ns

resolution at 20 MHz operation and 700 ps resolution at 30

MHz operation.

The AD9891 is specified at pixel rates of up to 20 MHz, and

the AD9895 is specified at 30 MHz. The analog front end

includes black level clamping, CDS, PxGA, VGA, and a 10-Bit

or 12-Bit A/D converter. The timing generator provides all the

necessary CCD clocks: RG, H-clocks, V-clocks, sensor gate

pulses, substrate clock, and substrate bias control. Operation is

programmed using a 3-wire serial interface.

Packaged in a space-saving 64-lead CSPBGA, the AD9891 and

AD9895 are specified over an operating temperature range of

–20

°C to +85°C.

Số phần tương tự - AD9895

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Analog Devices	AD9895	670Kb / 58P	CCD Signal Processors with Precision Timing Generator REV. A

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