REV. A

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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

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a

AD9848/AD9849

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

© 2003 Analog Devices, Inc.

CCD Signal Processors with

Integrated Timing Driver

FUNCTIONAL BLOCK DIAGRAM

CLAMP

DOUT

CCDIN

PBLK

VRT

VRB

INTERNAL

REGISTERS

2dB TO 36dB

SYNC

GENERATOR

SDATA

SCK

SL

CLPOB

10 OR 12

VGA

AD9848/AD9849

4 6dB

PRECISION

TIMING

CORE

ADC

VREF

CLAMP

INTERNAL

CLOCKS

PxGA

CDS

HORIZONTAL

DRIVERS

4

RG

H1–H4

HD

VD

CLI

CLPDM

FEATURES

AD9848: 10-Bit, 20 MHz Version

AD9849: 12-Bit, 30 MHz Version

Correlated Double Sampler (CDS)

–2 dB to +10 dB Pixel Gain Amplifier (

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

10-Bit 20 MHz A/D Converter (AD9848)

12-Bit 30 MHz A/D Converter (AD9849)

Black Level Clamp with Variable Level Control

Complete On-Chip Timing Driver

On-Chip 3 V Horizontal and RG Drivers (AD9848)

On-Chip 5 V Horizontal and RG Drivers (AD9849)

48-Lead LQFP Package

APPLICATIONS

Digital Still Cameras

PRODUCT DESCRIPTION

The AD9848 and AD9849 are highly integrated CCD signal pro-

cessors for digital still camera applications. Both include a complete

analog front end with A/D conversion, combined with a program-

mable timing driver. The Precision Timing core allows adjustment

of high speed clocks with approximately 1 ns resolution.

The AD9848 is specified at pixel rates of 20 MHz, and the

AD9849 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 driver provides the high speed CCD clock

drivers for RG and H1–H4. Operation is programmed using a

3-wire serial interface.

Packaged in a space saving 48-lead LQFP, the AD9848 and

AD9849 are specified over an operating temperature range of

–20

°C to +85°C.

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