Texas Instruments ADS1216 Data Sheet/Manual

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ADS1216

ADS1216

SBAS171B – JUNE 2001

8-Channel, 24-Bit

ANALOG-TO-DIGITAL CONVERTER

FEATURES DESCRIPTION 24 BITS NO MISSING CODES The ADS1216 is a precision, wide dynamic range, delta-sigma, Analog-

0.0015% INL to-Digital (A/D) converter with 24-bit resolution operating from 2.7V to 5.25V supplies. The delta-sigma, A/D converter provides up to 24 bits of

22 BITS EFFECTIVE RESOLUTION

no missing code performance and effective resolution of 22 bits.

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

The eight input channels are multiplexed. Internal buffering can be

PGA FROM 1 TO 128

selected to provide a very high input impedance for direct connection to

SINGLE CYCLE SETTLING MODE

transducers or low-level voltage signals. Burn out current sources are

PROGRAMMABLE DATA OUTPUT RATES provided that allow for the detection of an open or shorted sensor. An 8- UP TO 1k Hz bit Digital-to-Analog (D/A) converter provides an offset correction with

ON-CHIP 1.25V/2.5V REFERENCE a range of 50% of the FSR (Full-Scale Range). EXTERNAL DIFFERENTIAL REFERENCE The PGA (Programmable Gain Amplifier) provides selectable gains OF 0.1V TO 2.5V 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-

ON-CHIP CALIBRATION

sigma modulator and programmable sinc filter. The reference input

SPI™ COMPATIBLE

is differential and can be used for ratiometric cancellation. The on-

2.7V TO 5.25V board current DACs (Digital-to-Analog Converters) operate inde-

< 1m W POWER CONSUMPTION pendently with the maximum current set by an external resistor. The serial interface is SPI compatible. Eight bits of digital I/O are also provided that can be used for input or output. The ADS1216 is

APPLICATIONS

designed for high-resolution measurement applications in smart

INDUSTRIAL PROCESS CONTROL transmitters, industrial process control, weight scales, chromatogra-

phy, and portable instrumentation.

LIQUID/GAS CHROMATOGRAPHY BLOOD ANALYSIS

AGND AVDD RDAC VREFOUT VRCAP VREF+ VREF– XIN XOUT

SMART TRANSMITTERS

PORTABLE INSTRUMENTATION 8-Bit

IDAC2

Clock Generator

1.25V or

WEIGHT SCALES 2.5V

8-Bit

IDAC1 Reference

AVDD IDAC

PRESSURE TRANSDUCERS

2µA Offset

SPI is a registered trademark of Motorola.

AIN1 A = 1:128

IN+ Registers

AIN2 Program-

AIN3 2nd-Order mable

MUX BUF PGA Controller

IN– Modulator Digital

Filter RAM

AIN5 AIN6 AIN7 AINCOM

2µA Digital I/O Serial Interface DIN

Interface DOUT

AGND CS

...D0 DSYNCPDWN RESET DRDYD7BUFENDGNDDVDD

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. Copyright © 2000, 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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