Product category:
Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: ADS1232 and ADS1234
Edited by the Electronicstalk Editorial
Team on 24 October 2005
ADCs provide complete bridge sensor
front end
New 24bit analogue-to-digital convertors integrate low-noise programmable gain amplifiers, precision delta-sigma ADCs and internal oscillators.
Texas Instruments has released a pair of 24bit analogue-to-digital convertors (ADCs) from the company's Burr-Brown product line which integrate a low-noise programmable gain amplifier (PGA), precision delta-sigma ADC and internal oscillator Fabricated using TI's high-performance, precision mixed-signal CMOS technology, the ADS1232 and ADS1234 provide a complete front-end solution for bridge sensor applications, including weigh scales, strain gauges and pressure sensors
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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"The ADS1232 and ADS1234 combine unmatched performance and functionality in a small package to deliver an easy-to-use, very low-noise front-end for direct interface to bridge sensors", said David Russell, Strategic Marketing Engineer for TI's oversampling data convertor products.
The input multiplexer accepts either two (ADS1232) or four (ADS1234) differential inputs.
The ADS1232 includes an onboard temperature sensor to monitor ambient temperature.
Following the multiplexer, the low-noise PGA features RMS noise of only 17nV (at 10sample/s datarate) or 44nV (at 80sample/s datarate) and has a selectable gain of 1, 2, 64 or 128, supporting a full-scale differential input of +/-2.5V, +/-1.25V, +/-39mV or +/-19.5mV.
The PGA drives the high-resolution, delta-sigma ADC with 23.5bit of RMS noise performance.
The ADS1232 and ADS1234 were designed for ease of use.
Dedicated I/O pins for setting gain, datarate and input channel (no on-chip digital registers to program) greatly simplify control.
Either the internal, low-drift oscillator, external crystal or external oscillator can provide the clocking.
Data is output over an easily isolated, two-wire interface that connects directly to TI's MSP430 and other microcontrollers.
When not in use, the ADS1232 and ADS1234 can be put in a low-power standby mode, or shut down completely.
The ADS1232 and ADS1234, which are RoHS-compatible "green" devices, are available now from TI and its authorised distributors.
The ADS1232 is packaged in a TSSOP-24 and is priced from $3.90 in 1000 piece quantities (suggested resale pricing).
The ADS1234 is packaged in a TSSOP-28 and is priced from $4.50 in 1000 piece quantities.
Evaluation modules are also available.
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