Texas Instruments ADS1245 Handleiding

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FEATURES

D20-Bit Effective Resolution

DHigh-Impedance Buffered Input

D±2.5V Differential Input Range

DPin-Compatible with ADS1244

D0.0006% INL (typ), 0.0015% INL (max)

DSimple Two-Wire Serial Interface

DSimultaneous 50Hz and 60Hz Rejection

DSingle Conversions with Sleep Mode

DSingle-Cycle Settling

DSelf-Calibration

DWell Suited for Multi-Channel Systems

DEasily Connects to the MSP430

DCurrent Consumption: 158µA

DAnalog Supply: 2.5V to 5.25V

DDigital Supply: 1.8V to 3.6V

APPLICATIONS

DHand-Held Instrumentation

DPortable Medical Equipment

DIndustrial Process Control

DTest and Measurement Systems

DESCRIPTION

The ADS1245 is a 24-bit, delta-sigma analog-to-digital

converter (ADC). It offers excellent performance and very

low power in an MSOP-10 package and is well suited for

demanding high-resolution measurements, especially in

portable and other space- and power-constrained

systems.

The buffered input presents an impedance of 3GΩ, mini-

mizing measurement errors when using high-impedance

sources. The ADS1245 is compatible with ADS1244 and

offers a direct upgrade path for designs requiring higher in-

put impedance.

A third-order delta-sigma (∆Σ) modulator and digital filter

form the basis of the ADC. The analog modulator has a

±2.5V differential input range. The digital filter rejects both

50Hz and 60Hz signals, completely settles in one cycle,

and outputs data at 15 samples per second (SPS).

A simple, two-wire serial interface provides all the

necessary control. Data retrieval, self-calibration, and

Sleep mode are handled with a few simple waveforms.

When only single conversions are needed, the ADS1245

can be shut down (Sleep mode) while idle between

measurements to dramatically reduce the overall power

dissipation. Multiple ADS1245s can be connected

together to create a synchronously sampling multichannel

measurement system. The ADS1245 is designed to easily

connect to microcontrollers, such as the MSP430.

The ADS1245 supports 2.5V to 5.25V analog supplies and

1.8V to 3.6V digital supplies. Power is typically less than

470µW in normal operation and less than 1µW during

Sleep mode.

Digital

Filter

Serial

Interface

DRDY/DOUT

SCLK

CLK

AINN

AINP

VREFPVREFNAVDD

GND

DVDD

3rd−Order

Modulator

Buffer

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SBAS287A − JUNE 2003 − REVISED SEPTEMBER 2003

Low-Power, 24-Bit

Analog-to-Digital Converter

ADS1245

www.ti.com

Copyright  2003, 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.

Product specificaties