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 resolu-

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

architecture is used for wide dynamic range and 24 bits of no

missing code 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, indus-

trial process control, weigh scales, chromatography, and

portable instrumentation. The converter includes a flexible,

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

The ADS1253 is a 4-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

SBAS199B – MAY 2001 – REVISED SEPTEMBER 2007

www.ti.com

Copyright © 2001-2007, Texas Instruments Incorporated

ADS1253

4th-Order

∆Σ

Modulator

Digital

Filter

Serial

Interface

Control

CLK

VREF

SCLK

DOUT/DRDY

+VDD

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.

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.

All trademarks are the property of their respective owners.