REV. 0

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

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a

AD9802

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

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1997

CCD Signal Processor

For Electronic Cameras

FUNCTIONAL BLOCK DIAGRAM

SHP

AD9802

PGACONT1 PGACONT2

CLAMP

CLPDM

PBLK

PIN

DIN

SHD ADCCLK

TIMING

GENERATOR

CMLEVEL VRT VRB STBY

REFERENCE

S/H

CLPOB

CLAMP

DOUT

10

PGA

CDS

A/D

ADCIN

ADCMODE

MUX

DRVDD

DVDD

ADVDD

ACVDD

FEATURES

10-Bit, 18 MSPS A/D Converter

18 MSPS Full Speed Correlated Double Sampler (CDS)

Low Noise, Wideband PGA

Internal Voltage Reference

No Missing Codes Guaranteed

+3 V Single Supply Operation

Low Power CMOS: 185 mW

48-Terminal TQFP Package

PRODUCT HIGHLIGHTS

1. On-Chip Input Clamp and CDS

Clamp circuitry and high speed correlated double sampler

allow for simple ac-coupling to interface a CCD sensor at full

18 MSPS conversion rate.

2. On-Chip PGA

The AD9802 includes a low-noise, wideband amplifier with

analog variable gain from 0 dB to 31.5 dB (linear in dB).

3. Direct ADC Input

A direct input to the 10-bit A/D converter is provided for

digitizing video signals.

4. 10-Bit, High Speed A/D Converter

A linear 10-bit ADC is capable of digitizing CCD signals at

the full 18 MSPS conversion rate. Typical DNL is

±0.5 LSB

and no missing code performance is guaranteed.

5. Low Power

At 185 mW, and 15 mW in power-down, the AD9802 con-

sumes a fraction of the power of presently available multichip

solutions.

6. Digital I/O Functionality

The AD9802 offers three-state digital output control.

7. Small Package

Packaged in a 48-terminal, surface-mount thin quad flatpack,

the AD9802 is well suited to very compact, low headroom

designs.

PRODUCT DESCRIPTION

The AD9802 is a complete CCD signal processor developed

for electronic cameras. It is suitable for both camcorder and

consumer-level still camera applications.

The signal processing chain is comprised of a high speed CDS,

variable gain PGA and 10-bit ADC. Required clamping cir-

cuitry and an onboard voltage reference are provided as well as a

direct ADC input. The AD9802 operates from a single +3 V

supply with a typical power consumption of 185 mW.

The AD9802 is packaged in a space saving 48-terminal thin

quad flatpack (TQFP) and is specified over an operating tem-

perature range of 0

°C to +70°C.

OBSOLETE