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.

24-Bit

ANALOG-TO-DIGITAL CONVERTER

FEATURES

q 24 BITS NO MISSING CODES

q SIMULTANEOUS 50Hz AND 60Hz REJECTION

(–90dB MINIMUM)

q 0.0015% INL

q 21 BITS EFFECTIVE RESOLUTION

(PGA = 1), 19 BITS (PGA = 128)

q PGA GAINS FROM 1 TO 128

q SINGLE-CYCLE SETTLING

q PROGRAMMABLE DATA OUTPUT RATES

q EXTERNAL DIFFERENTIAL REFERENCE

OF 0.1V TO 5V

q ON-CHIP CALIBRATION

q SPI™ COMPATIBLE

q 2.7V TO 5.25V SUPPLY RANGE

q 600

µW POWER CONSUMPTION

q UP TO EIGHT INPUT CHANNELS

q UP TO EIGHT DATA I/O

DESCRIPTION

The ADS1242 and ADS1243 are precision, wide dynamic

range, delta-sigma, analog-to-digital (A/D) converters with

24-bit resolution operating from 2.7V to 5.25V supplies.

These delta-sigma, A/D converters provide up to 24 bits of no

missing code performance and effective resolution of 21 bits.

The input channels are multiplexed. Internal buffering can be

selected to provide a very high input impedance for direct

connection to transducers or low-level voltage signals. Burn-

out current sources are provided that allow for the detection

of an open or shorted sensor. An 8-bit digital-to-analog

converter (DAC) provides an offset correction with a range of

50% of the FSR (Full-Scale Range).

The Programmable Gain Amplifier (PGA) provides selectable

gains of 1 to 128 with an effective resolution of 19 bits at a gain

of 128. The A/D conversion is accomplished with a second-order

delta-sigma modulator and programmable FIR filter that pro-

vides a simultaneous 50Hz and 60Hz notch. The reference input

is differential and can be used for ratiometric conversion.

The serial interface is SPI compatible. Up to eight bits of data

I/O are also provided that can be used for input or output. The

ADS1242 and ADS1243 are designed for high-resolution

measurement applications in smart transmitters, industrial

process control, weight scales, chromatography, and portable

instrumentation.

APPLICATIONS

q INDUSTRIAL PROCESS CONTROL

q LIQUID /GAS CHROMATOGRAPHY

q BLOOD ANALYSIS

q SMART TRANSMITTERS

q PORTABLE INSTRUMENTATION

q WEIGHT SCALES

ADS1242

ADS1243

SBAS235H – DECEMBER 2001 – REVISED OCTOBER 2013

www.ti.com

Copyright © 2001-2013, 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.

®

ADS1

243

®

ADS1

242

BUF

PGA

A = 1:128

+

Clock Generator

Serial Interface

2nd-Order

Modulator

GND

V

DD

IN+

IN–

V

REF+

V

REF–

X

IN

X

OUT

PDWN

DRDY

SCLK

D

IN

D

OUT

CS

MUX

A

A

A

A

A

A

A

A

Controller

Registers

Digital

Filter

2

µA

V

DD

Offset

DAC

GND

2

µA

ADS1243

Only

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