24-bit ADC for bridge sensor applications

8 February 2006 Analogue, Mixed Signal, LSI

Texas Instruments has released a pair of CMOS 24-bit ADCs from the company's Burr-Brown product line that integrate a low-noise programmable gain amplifier (PGA), precision delta-sigma ADC and internal oscillator. The ADS1232 and ADS1234 provide a complete front-end solution for bridge sensor applications, including weigh scales, strain gauges and pressure sensors. 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 17 nV (at 10 SPS data rate) or 44 nV (at 80 SPS data rate) and has a selectable gain of 1, 2, 64 or 128, supporting a full-scale differential input of ±2,5 V, ±1,25 V, ±39 mV or ±19,5 mV. Dedicated I/O pins for setting gain, data rate and input channel (no on-chip digital registers to program) greatly simplify control. Clocking is provided by either the internal oscillator, or external crystal/oscillator. Data is output over a two-wire interface that connects directly to a microcontroller.

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