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

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

otherwise under any patent or patent rights of Analog Devices.

a

AD9203

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., 1999

10-Bit, 40 MSPS, 3 V, 74 mW

A/D Converter

FEATURES

CMOS 10-Bit 40 MSPS Sampling A/D Converter

Power Dissipation: 74 mW (3 V Supply, 40 MSPS)

17 mW (3 V Supply, 5 MSPS)

Operation Between 2.7 V and 3.6 V Supply

Differential Nonlinearity:

0.25 LSB

Power-Down (Standby) Mode, 0.65 mW

Out-of-Range Indicator

Adjustable On-Chip Voltage Reference

Input Range: 1 V to 2 V p-p Differential or Single-Ended

Adjustable Power Consumption

Internal Clamp Circuit

APPLICATIONS

CCD Imaging

Video

Portable Instrumentation

IF and Baseband Communications

Cable Modems

Medical Ultrasound

PRODUCT DESCRIPTION

The AD9203 is a monolithic low power, single supply, 10-bit,

40 MSPS analog-to-digital converter, with an on-chip voltage

reference. The AD9203 uses a multistage differential pipeline

architecture and guarantees no missing codes over the full oper-

ating temperature range. Its input range may be adjusted be-

tween 1 V and 2 V p-p.

The AD9203 has an onboard programmable reference. An

external reference can also be chosen to suit the dc accuracy and

temperature drift requirements of an application.

An external resistor can be used to reduce power consumption

when operating at lower sampling rates. This yields power sav-

ings for users who do not require the maximum sample rate.

This feature is especially useful at sample rates far below 40

MSPS. Excellent performance is still achieved at reduced power.

For example, 9.7 ENOB performance may be realized with only

17 mW of power, using a 5 MHz clock.

A single clock input is used to control all internal conversion

cycles. The digital output data is presented in straight binary or

twos complementary output format by using the DFS pin. An

out-of-range signal (OTR) indicates an overflow condition that

can be used with the most significant bit to determine over or

under range.

The AD9203 can operate with a supply range from 2.7 V to

3.6 V, attractive for low power operation in high speed por-

table applications.

The AD9203 is specified over industrial (–40

°C to +85°C)

temperature ranges and is available in a 28-lead TSSOP

package.

PRODUCT HIGHLIGHTS

Low Power

The AD9203 consumes 74 mW on a 3 V supply operating at

40 MSPS. In standby mode, power is reduced to 0.65 mW.

High Performance

Maintains better than 9.55 ENOB at 40 MSPS input signal

from dc to Nyquist.

Very Small Package

The AD9203 is available in a 28-lead TSSOP.

Programmable Power

The AD9203 power can be further reduced by using an external

resistor at lower sample rates.

Built-In Clamp Function

Allows dc restoration of video signals.

FUNCTIONAL BLOCK DIAGRAM

SHA

GAIN

A/D

D/A

SHA

GAIN

A/D

D/A

A/D

CORRECTION LOGIC

AD9203

OUTPUT BUFFERS

10

+

–

0.5V

BANDGAP

REFERENCE

CLK

AVDD

DRVDD

STBY

3 STATE

OTR

D9 (MSB)

D0 (LSB)

DRVSS

DFS

PWRCON

AVSS

CLAMP

CLAMPIN

AINP

AINN

REFTF

REFBF

VREF

REFSENSE