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ADS1254

更新时间： 2024-11-04 22:47:39

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描述
24-Bit, 20kHz, Low Power ANALOG-TO-DIGITAL CONVERTER

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ADS1254 数据手册

ADS1254

SBAS213 – JUNE 2001

24-Bit, 20kHz, Low Power

ANALOG-TO-DIGITAL CONVERTER

DESCRIPTION

FEATURES

The ADS1254 is a precision, wide dynamic range, delta-

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

lution. The delta-sigma architecture is used for wide dy-

namic range and to ensure 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.

● 24 BITS—NO MISSING CODES

● 19 BITS EFFECTIVE RESOLUTION UP TO

20kHz DATA RATE

● LOW NOISE: 1.8ppm

● FOUR DIFFERENTIAL INPUTS

● INL: 15ppm (max)

The ADS1254 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.

● EXTERNAL REFERENCE (0.5V to 5V)

● POWER-DOWN MODE

● SYNC MODE

● LOW POWER: 4mW at 20kHz

The ADS1254 is a multi-channel converter and is offered in

an SSOP-20 package.

● SEPARATE DIGITAL INTERFACE SUPPLY 1.8V

to 3.6V

APPLICATIONS

● CARDIAC DIAGNOSTICS

● DIRECT THERMOCOUPLE INTERFACES

● BLOOD ANALYSIS

● INFRARED PYROMETERS

● LIQUID/GAS CHROMATOGRAPHY

● PRECISION PROCESS CONTROL

ADS1254

V_REF

CLK

CH1+

CH1–

CH2+

4th-Order

∆Σ

Modulator

CH2–

SCLK

Digital

Filter

Serial

Interface

Mux

DOUT/DRDY

CH3+

CH3–

CH4+

CH4–

AV_DD

AGND

DV_DD

Control

DGND

CHSEL0 CHSEL1

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.

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.

www.ti.com

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