10-Bit, 40MHz Sampling

ANALOG-TO-DIGITAL CONVERTER

FEATURES

q NO MISSING CODES

q INTERNAL REFERENCE

q LOW POWER: 380mW

q HIGH SNR: 58dB

q INTERNAL TRACK-AND-HOLD

DESCRIPTION

The ADS821 is a low-power, monolithic 10-bit, 40MHz Ana-

log-to-Digital (A/D) converter utilizing a small geometry CMOS

process. This complete converter includes a 10-bit quantizer

with internal track-and-hold, reference, and a power-down

feature. It operates from a single +5V power supply and can

be configured to accept either differential or single-ended

input signals.

The ADS821 employs digital error correction to provide

excellent Nyquist differential linearity performance for de-

manding imaging applications. Its low distortion, high SNR,

and high oversampling capability give it the extra margin

needed for telecommunications and video applications.

This high-performance converter is specified for AC and DC-

performance at a 40MHz sampling rate. The ADS821 is

available in an SO-28 package.

APPLICATIONS

q VIDEO DIGITIZING

q ULTRASOUND IMAGING

q GAMMA CAMERAS

q SET-TOP BOXES

q CABLE MODEMS

q CCD IMAGING

Color Copiers

Scanners

Camcorders

Security Cameras

Fax Machines

q IF AND BASEBAND DIGITIZATION

q TEST INSTRUMENTATION

ADS821

SBAS040B – DECEMBER 1995 – REVISED FEBRUARY 2005

www.ti.com

Copyright © 1995-2005, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Pipeline

A/D

Converter

Timing

Circuitry

Error

Correction

Logic

3-State

Outputs

T&H

10-Bit

Digital

Data

CLK

+1.25V

+3.25V

MSBI

OE

IN

IN

REFT

CM

REFB

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

ADS8

21U

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