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a

AD9801

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

Tel: 617/329-4700

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

Fax: 617/326-8703

© Analog Devices, Inc., 1997

CCD Signal Processor

For Electronic Cameras

FUNCTIONAL BLOCK DIAGRAM

SHP

AD9801

PGA

PGACONT1 PGACONT2

CLAMP

CLPDM

CDS

PBLK

PIN

DIN

SHD ADCCLK

TIMING

GENERATOR

23

29

30

19

21

22

16

27

26

37

48

47

18

CMLEVEL VRT VRB STBY

REFERENCE

S/H

20

CLPOB

CLAMP

A/D

2

11

DOUT

33

ACVDD

43

ADVDD

17

DVDD

10

FEATURES

10-Bit, 18 MSPS A/D Converter

18 MSPS Full-Speed CDS

Low Noise, Wideband PGA

Internal Voltage Reference

No Missing Codes Guaranteed

+3 V Single Supply Operation

Low Power CMOS: 185 mW

48-Pin TQFP Package

PRODUCT DESCRIPTION

The AD9801 is a complete CCD signal processor developed for

electronic cameras. It is well suited for both video conferencing

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

circuitry and an onboard voltage reference are also provided.

The AD9801 operates from a single +3 V supply with a typical

power consumption of 185 mW.

The AD9801 is packaged in a space saving 48-pin thin-quad

flatpack (TQFP) and is specified over an operating temperature

range of 0

°C to +70°C.

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 AD9801 includes a low noise, wideband amplifier with

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

3. 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.)

4. Low Power

At 185 mW, the AD9801 consumes a fraction of the power of

presently available multichip solutions. The part’s power-

down mode (15 mW) further enhances its desirability in low

power, battery operated applications.

5. Digital I/O Functionality

The AD9801 offers three-state digital output control.

6. Small Package

Packaged in a 48-pin, surface-mount thin-quad flatpack, the

AD9801 is well suited to very tight, low headroom designs.