Product category: Analogue and Mixed Signal ICs
News Release from: Silica | Subject: ADS1258
Edited by the Electronicstalk Editorial Team on 2 August 2006
Convertor scans 16 channels in a cycle
A 16-channel low-noise 24bit delta-sigma analogue-to-digital convertor provides single-cycle settled data at channel scan rates from 1.8 to 23.7Ksample/s per channel
The ADS1258 is a 16-channel (multiplexed), low-noise, 24bit, delta-sigma analogue-to-digital convertor (ADC) that provides single-cycle settled data at channel scan rates from 1.8 to 23.7Ksample/s per channel. A flexible input multiplexer accepts combinations of eight differential or 16 single-ended inputs with a full-scale differential range of 5V or true bipolar range of +/-2.5V when operating with a 5V reference.
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The fourth-order delta-sigma modulator is followed by a fifth-order sync digital filter optimised for low-noise performance.
The differential output of the multiplexer is accessible to allow signal conditioning prior to the input of the ADC.
Internal system monitor registers provide supply voltage, temperature, reference voltage, gain, and offset data.
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An onboard PLL generates the system clock from a 32.768kHz crystal, or can be overridden by an external clock source.
A buffered system clock output (15.7MHz) is provided to drive a microcontroller or additional convertors.
Serial digital communication is handled via an SPI-compatible interface.
A simple command word structure controls channel configuration, datarates, digital I/O, monitor functions etc.
Programmable sensor bias current sources can be used to bias sensors or verify sensor integrity.
The ADS1258 operates from a unipolar +5V or bipolar +/-2.5V analogue supply and a digital supply compatible with interfaces ranging from 2.7 to 5.25V.
The ADS1258 is available in a QFN-48 package.
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