10-Bit, 40MHz Sampling

ANALOG-TO-DIGITAL CONVERTERS

FEATURES

q HIGH SNR: 60dB

q HIGH SFDR: 72dBFS

q LOW POWER: 190mW

q INTERNAL/EXTERNAL REFERENCE OPTION

q SINGLE-ENDED OR

FULLY DIFFERENTIAL ANALOG INPUT

q PROGRAMMABLE INPUT RANGE

q LOW DNL: 0.5LSB

q SINGLE +5V SUPPLY OPERATION

q +3V OR +5V LOGIC I/O COMPATIBLE (ADS825)

q POWER DOWN: 20mW

q SSOP-28 PACKAGE

APPLICATIONS

q MEDICAL IMAGING

q TEST EQUIPMENT

q COMPUTER SCANNERS

q COMMUNICATIONS

q VIDEO DIGITIZING

DESCRIPTION

The ADS822 and ADS825 are pipeline, CMOS Analog-to-Digital

Converters (ADC) that operate from a single +5V power supply.

These converters provide excellent performance with a single-ended

input and can be operated with a differential input for added spurious

performance. These high-performance converters include a 10-bit

quantizer, high-bandwidth track-and-hold, and a high-accuracy inter-

nal reference. They also allow for the user to disable the internal

reference and utilize external references. This external reference

option provides excellent gain and offset matching when used in

multichannel applications, or in applications where full-scale range

adjustment is required.

10-Bit

Pipelined

A/D Core

Internal

Reference

Optional External

Reference

Timing

Circuitry

Error

Correction

Logic

3-State

Outputs

T/H

CLK

VDRV

ADS822

ADS825

+V

S

OE

PD

Int/Ext

D0

D9

•

•

•

IN

V

IN

IN

CM

ADS

822

ADS825

ADS822

ADS825

SBAS069B – MARCH 2001 – REVISED AUGUST 2002

www.ti.com

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.

Copyright © 2001, 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.

The ADS822 and ADS825 employ digital error correction techniques

to provide excellent differential linearity for demanding imaging appli-

cations. Its low distortion and high SNR give the extra margin needed

for medical imaging, communications, video, and test instrumentation.

The ADS822 and ADS825 offer power dissipation of 190mW and also

provide a power-down mode, thus reducing power dissipation to only

20mW. The ADS825 is +3V or +5V logic I/O compatible.

The ADS822 and ADS825 are specified at a maximum sampling

frequency of 40MSPS and a single-ended input range of 1.5V to 3.5V.

The ADS822 and ADS825 are available in an SSOP-28 package and

are pin-for-pin compatible with the 10-bit, 60MSPS ADS823 and

ADS826, and the 10-bit, 75MSPS ADS828, providing an upgrade

path to higher sampling frequencies.