FEATURES

DELTA-SIGMA A/D CONVERTER

22 BITS NO MISSING CODES

20 BITS EFFECTIVE RESOLUTION AT 10Hz

AND 16 BITS AT 1000Hz

LOW POWER: 1.4mW

DIFFERENTIAL INPUTS

PROGRAMMABLE GAIN AMPLIFIER

SPI™ COMPATIBLE SSI INTERFACE

PROGRAMMABLE CUTOFF FREQUENCY

UP TO 6.25kHz

INTERNAL/EXTERNAL REFERENCE

ON-CHIP SELF-CALIBRATION

ADS1213 INCLUDES 4-CHANNEL MUX

APPLICATIONS

INDUSTRIAL PROCESS CONTROL

INSTRUMENTATION

BLOOD ANALYSIS

SMART TRANSMITTERS

PORTABLE INSTRUMENTS

WEIGH SCALES

PRESSURE TRANSDUCERS

DESCRIPTION

The ADS1212 and ADS1213 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 20

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

amplifier at conversion rates up to 10Hz. Effective resolutions

of 16 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 ADS1212 and ADS1213 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 ADS1212 is a single channel converter and is offered in

both DIP-18 and SO-18 packages. The ADS1213 includes a

4-channel input multiplexer and is available in DIP-24,

SO-24, and SSOP-28 packages.