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FEATURES

DELTA-SIGMA A/D CONVERTER

23 BITS EFFECTIVE RESOLUTION AT 10Hz

AND 20 BITS AT 1000Hz

DIFFERENTIAL INPUTS

PROGRAMMABLE GAIN AMPLIFIER

FLEXIBLE SPI?-COMPATIBLE SSI

INTERFACE WITH 2-WIRE MODE

PROGRAMMABLE CUT-OFF FREQUENCY

UP TO 15.6kHz

INTERNAL/EXTERNAL REFERENCE

ON-CHIP SELF-CALIBRATION

ADS1211 INCLUDES 4-CHANNEL MUX

APPLICATIONS

INDUSTRIAL PROCESS CONTROL

INSTRUMENTATION

BLOOD ANALYSIS

SMART TRANSMITTERS

PORTABLE INSTRUMENTS

WEIGH SCALES

PRESSURE TRANSDUCERS

DESCRIPTION

The ADS1210 and ADS1211 are precision, wide dynamic

range, delta-sigma Analog-to-Digital (A/D) converters with

24-bit resolution operating from a single +5V supply. The

differential inputs are ideal for direct connection to transducers

or low-level voltage signals. The delta-sigma architecture

is used for wide dynamic range and to ensure 22 bits

of no-missing-code performance. An effective resolution of

23 bits is achieved through the use of a very low-noise input

amplifier at conversion rates up to 10Hz. Effective resolutions

of 20 bits can be maintained up to a sample rate of

1kHz through the use of the unique Turbo modulator mode

of operation. The dynamic range of the converters is further

increased by providing a low-noise programmable gain

amplifier with a gain range of 1 to 16 in binary steps.

The ADS1210 and ADS1211 are designed for high resolution

measurement applications in smart transmitters, industrial

process control, weigh scales, chromatography, and portable

instrumentation. Both converters include a flexible synchronous

serial interface that is SPI-compatible and also offers a

two-wire control mode for low cost isolation.

The ADS1210 is a single-channel converter and is offered in

both 18-pin DIP and 18-lead SOIC packages. The ADS1211

includes a 4-channel input multiplexer and is available in 24-

pin DIP, 24-lead SOIC, and 28-lead SSOP packages.