REV. B

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a

10-Bit 20 MSPS 160 mW

CMOS A/D Converter

AD876

FEATURES

CMOS 10-Bit 20 MSPS Sampling A/D Converter

Pin-Compatible 8-Bit Option

Power Dissipation: 160 mW

+5 V Single Supply Operation

Differential Nonlinearity: 0.5 LSB

Guaranteed No Missing Codes

Power Down (Standby) Mode

Three-State Outputs

Digital I/Os Compatible with +5 V or +3.3 V Logic

Adjustable Reference Input

Small Size: 28-Lead SOIC, 28-Lead SSOP, or 48-Lead

Thin Quad Flatpack (TQFP)

PRODUCT DESCRIPTION

The AD876 is a CMOS, 160 mW, 10-bit, 20 MSPS analog-to-

digital converter (ADC). The AD876 has an on-chip input

sample-and-hold amplifier. By implementing a multistage pipe-

lined architecture with output error correction logic, the AD876

offers accurate performance and guarantees no missing codes

over the full operating temperature range. Force and sense con-

nections to the reference inputs minimize external voltage drops.

The AD876 can be placed into a standby mode of operation

reducing the power below 50 mW. The AD876’s digital I/O

interfaces to either +5 V or +3.3 V logic. Digital output pins

can be placed in a high impedance state; the format of the out-

put is straight binary coding.

The AD876’s speed, resolution and single-supply operation

ideally suit a variety of applications in video, multimedia, imag-

ing, high speed data acquisition and communications. The

AD876’s low power and single-supply operation satisfy require-

ments for high speed portable applications. Its speed and reso-

lution ideally suit charge coupled device (CCD) input systems

such as color scanners, digital copiers, electronic still cameras

and camcorders.

The AD876 comes in a space saving 28-lead SOIC and 48-lead

thin quad flatpack (TQFP) and is specified over the commercial

(0

°C to +70°C) temperature range.

PRODUCT HIGHLIGHTS

Low Power

The AD876 at 160 mW consumes a fraction of the power of

presently available 8- or 10-bit, video speed converters. Power-

down mode and single-supply operation further enhance its

desirability in low power, battery operated applications such

as electronic still cameras, camcorders and communication

systems.

Very Small Package

The AD876 comes in a 28-lead SOIC, 28-lead SSOP, and 48-

lead surface mount, thin quad flat package. The TQFP package

is ideal for very tight, low headroom designs.

Digital I/O Functionality

The AD876 offers three-state output control.

Pin Compatible Upgrade Path

The AD876 offers the option of laying out designs for eight

bits and migrating to 10-bit resolution if prototype results

warrant.

FUNCTIONAL BLOCK DIAGRAM

A/D

D/A

A/D

D/A

A/D

D/A

A/D

CORRECTION LOGIC

AIN

REFTF

REFTS

REFBS

REFBF

STBY

THREE-

STATE

(MSB)

D9

D0

(LSB)

CLK

CML

AD876

SHA

SHA

SHA

GAIN

SHA

GAIN

GAIN

OUTPUT BUFFERS

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., 1998