SBAS286A − JUNE 2003 − REVISED MARCH 2004

24Bit AnalogtoDigital Converter

with 4Channel Differential Input Multiplexer

ADS1224

FEATURES

Channels

APPLICATIONS

DESCRIPTION

The ADS1224 is a 4-channel, 24-bit, delta-sigma ana-

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

mance and low power in a TSSOP-20 package. The

ADS1224 is well-suited for demanding, high-resolution

measurements, especially in portable systems and oth-

er space-saving and power-constrained applications.

A delta-sigma 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 four 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 ADS1224 can be quickly shut down (Standby mode)

while idle between measurements to dramatically

reduce the overall power consumption. Multiple

ADS1224s can be connected together to create a

synchronously sampling multichannel measurement

system. The ADS1224 is designed to easily connect to

microcontrollers, such as the MSP430.

The ADS1224 supports 2.7V to 5.5V analog supplies

and 2.7V to 5.5V digital supplies. Power is typically less

than 1mW in 3V operation and less than 1

Standby mode.

Mux

Digital Filter

and

Serial Interface

∆Σ

Modulator

VREFP VREFN

Buffer

AVDD

DVDD

GND

MUX0

AINP1

AINN1

AINP2

AINN2

AINP3

AINN3

AINP4

AINN4

CLK

DRDY/DOUT

SCLK

TEMPEN

MUX1

BUFEN

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PRODUCTION DATA information is current as of publication date. Products

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Production processing does not necessarily include testing of all parameters.