Texas Instruments ADS1224 Handleiding

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SBAS286C − JUNE 2003 − REVISED JANUARY 2009

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FEATURES

D240SPS Data Rate with 4MHz Clock

D20-Bit Effective Resolution

DInput Multiplexer with Four Differential

Channels

DPin-Selectable, High-Impedance Input Buffer

D±5V Differential Input Range

D0.0003% INL (typ), 0.0015% INL (max)

DSelf-Calibrating

DSimple 2-Wire Serial Interface

DOn-Chip Temperature Sensor

DSingle Conversions with Standby Mode

DLow Current Consumption: 300µA

DAnalog Supply: 2.7V to 5.5V

DDigital Supply: 2.7V to 5.5V

APPLICATIONS

DHand-Held Instrumentation

DPortable Medical Equipment

DIndustrial Process Control

DWeigh Scales

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 (∆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 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 1µW during

Standby mode.

Mux

DigitalFilter

and

SerialInterface

∆Σ

Modulator

VREFPVREFN

Buffer

AVDDDVDD

GNDMUX0

AINP1

AINN1

AINP2

AINN2

AINP3

AINN3

AINP4

AINN4

CLK

DRDY/DOUT

SCLK

TEMPEN

MUX1BUFEN

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

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