SBAS314B − APRIL 2004 − REVISED JANUARY 2009

24Bit AnalogtoDigital Converter

with 2Channel Differential Input Multiplexer

ADS1222

FEATURES

Channels

APPLICATIONS

DESCRIPTION

The ADS1222 is a 2-channel, 24-bit, delta-sigma ana-

log-to-digital (A/D) converter. It offers excellent perfor-

mance and low power in a TSSOP-14 package. The

ADS1222 is well-suited for demanding, high-resolution

measurements, especially in portable systems and oth-

er space-saving and power-constrained applications.

A delta-sigma (

∆Σ) modulator and digital filter form the

basis of the A/D converter. The analog modulator has

a

±5V differential input range. An input multiplexer

(MUX) is used to select between two separate

differential input channels. A buffer can be selected to

increase the input impedance of the measurement.

A simple, 2-wire serial interface provides all the

necessary control. Data retrieval, self-calibration, and

Standby mode are handled with a few simple

waveforms. When only single conversions are needed,

the ADS1222 can be quickly shut down (Standby mode)

while idle between measurements to dramatically

reduce the overall power consumption. Multiple

ADS1222s can be connected together to create a

synchronously sampling multichannel measurement

system. The ADS1222 is designed to easily connect to

microcontrollers, such as the MSP430.

The ADS1222 supports 2.7V to 5.5V supplies. Power

is typically less than 1mW in 3V operation and less than

1

Mux

Digital Filter

and

Serial Interface

∆Σ

Modulator

VREFP VREFN

Buffer

VDD

GND

MUX

AINP1

AINN1

AINP2

AINN2

CLK

DRDY/DOUT

SCLK

TEMPEN

BUFEN

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