24-Bit, 20kHz, Low Power

ANALOG-TO-DIGITAL CONVERTER

FEATURES

q 24 BITS—NO MISSING CODES

q 19 BITS EFFECTIVE RESOLUTION UP TO

20kHz DATA RATE

q LOW NOISE: 1.8ppm

q FOUR DIFFERENTIAL INPUTS

q INL: 15ppm (max)

q EXTERNAL REFERENCE (0.5V to 5V)

q POWER-DOWN MODE

q SYNC MODE

q LOW POWER: 8mW at 20kHz

5mW at 10kHz

DESCRIPTION

The ADS1253 is a precision, wide dynamic range, delta-

sigma, Analog-to-Digital (A/D) converter with 24-bit reso-

lution operating from a single +5V supply. The delta-sigma

architecture is used for wide dynamic range and to guarantee

24 bits of no missing codes performance. An effective

resolution of 19 bits (1.8ppm of rms noise) is achieved for

conversion rates up to 20kHz.

The ADS1253 is designed for high-resolution measurement

applications in cardiac diagnostics, smart transmitters, in-

dustrial process control, weight scales, chromatography, and

portable instrumentation. The converter includes a flexible,

two-wire synchronous serial interface for low-cost isolation.

The ADS1253 is a four-channel converter and is offered in

an SSOP-16 package.

APPLICATIONS

q CARDIAC DIAGNOSTICS

q DIRECT THERMOCOUPLE INTERFACES

q BLOOD ANALYSIS

q INFRARED PYROMETERS

q LIQUID/GAS CHROMATOGRAPHY

q PRECISION PROCESS CONTROL

ADS1253

SBAS199 – MAY 2001

www.ti.com

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.

ADS1253

4th-Order

∆Σ

Modulator

Digital

Filter

Serial

Interface

Control

CLK

SCLK

DOUT/DRDY

GND

ADS1253

Mux

CH1+

CH1–

CH2+

CH2–

CH3+

CH3–

CH4+

CH4–

CHSEL0

CHSEL1

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.