Texas Instruments ADS1240 ADS1241 Data Sheet Manual

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ADS1240 ADS1240

ADS1241

ADS1241

SBAS173C – JUNE 2001 – REVISED NOVEMBER 2003

24-Bit

ANALOG-TO-DIGITAL CONVERTER

FEATURES DESCRIPTION

24 BITS NO MISSING CODES The ADS1240 and ADS1241 are precision, wide dynamic range,

SIMULTANEOUS 50Hz AND 60Hz REJECTION delta-sigma, Analog-to-Digital (A/D) converters with 24-bit resolution (–90d B MINIMUM) operating from 2.7V to 5.25V power supplies. The delta-sigma A/D converter provides up to 24 bits of no missing code performance and

0.0015% INL

effective resolution of 21 bits.

21 BITS EFFECTIVE RESOLUTION

The input channels are multiplexed. Internal buffering can be

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

selected to provide very high input impedance for direct connection

PGA GAINS FROM 1 TO 128

to transducers or low-level voltage signals. Burnout current sources

SINGLE CYCLE SETTLING

are provided that allow for detection of an open or shorted sensor. PROGRAMMABLE DATA OUTPUT RATES An 8-bit Digital-to-Analog (D/A) converter provides an offset cor- rection with a range of 50% of the Full-Scale Range (FSR).

EXTERNAL DIFFERENTIAL REFERENCE

OF 0.1V TO 5V 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

ON-CHIP CALIBRATION

A/D conversion is accomplished with a 2nd-order delta-sigma modu-

SPI™ COMPATIBLE

lator and programmable Finite-Impulse Response (FIR) filter that

2.7V TO 5.25V SUPPLY RANGE

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

600µW POWER CONSUMPTION is differential and can be used for ratiometric conversion. UP TO EIGHT INPUT CHANNELS The serial interface is SPI compatible. Up to eight bits of data

UP TO EIGHT DATA I/O I/O are also provided that can be used for input or output. The ADS1240 and ADS1241 are designed for high-resolution measure- ment applications in smart transmitters, industrial process control, weigh scales, chromatography, and portable instrumentation.APPLICATIONS

INDUSTRIAL PROCESS CONTROL WEIGH SCALES VREF+ VREF–

AGNDAVDD XIN XOUT

LIQUID/GAS CHROMATOGRAPHY

BLOOD ANALYSIS AVDD

Clock Generator

SMART TRANSMITTERS

2µA Offset

PORTABLE INSTRUMENTATION DAC

AIN0/D0

AIN1/D1 A = 1:128

AIN2/D2

AIN3/D3 2nd-Order Digital

MUX BUF PGA Controller Registers

Modulator Filter

AIN4/D4 AIN5/D5 AIN6/D6 AIN7/D7 POL AINCOM SCLK

Serial Interface DIN

ADS1241

Only DOUT

DGNDDVDD DSYNCPDWN RESET DRDYBUFEN

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 property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2001-2003, Texas Instruments Incorporated Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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