Texas Instruments ADS1222 Handleiding

Bekijk gratis de handleiding van Texas Instruments ADS1222 (28 pagina’s), behorend tot de categorie Niet gecategoriseerd. Deze gids werd als nuttig beoordeeld door 2 mensen en kreeg gemiddeld 4.2 sterren uit 9 reviews. Heb je een vraag over Texas Instruments ADS1222 of wil je andere gebruikers van dit product iets vragen? Stel een vraag

SBAS314B − APRIL 2004 − REVISED JANUARY 2009



    



FEATURES

D240SPS Data Rate with 4MHz Clock

D20-Bit Effective Resolution

DInput Multiplexer with Two 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

APPLICATIONS

DHand-Held Instrumentation

DPortable Medical Equipment

DIndustrial Process Control

DWeigh Scales

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

1µW during Standby mode.

Mux

DigitalFilter

and

SerialInterface

∆Σ

Modulator

VREFPVREFN

Buffer

VDD

GNDMUX

AINP1

AINN1

AINP2

AINN2

CLK

DRDY/DOUT

SCLK

TEMPEN

BUFEN

www.ti.com

www.ti.com

Copyright 2004−2008, Texas Instruments Incorporated

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.

All trademarks are the property of their respective owners.

!"# " $ % & %  '& () (&%

&$  %&&%   $%  "% %$% %(( *)

(& &%% (%  &%%* &( %   $%)

Product specificaties