Abstract
We have developed a signal conditioning LSI which consists of a sigma delta AD converter, sigma delta DA converter, DSP and PROM. The AD converter of the LSI is able to directly digitize input signal from the sensor element with a swing less than 10mV with 1μV resolution. Therefore no preamplifier for adjusting the input signal from the sensor element to the AD conversion range is needed. The DSP is able to start up without a reset signal, though it is a stored program type signal processor. The sensing system using this DSP has no external parts, power on reset circuit, watch dog timer. The LSI have been integrated in a 0.8μm CMOS process and its chip is 4.3mm × 4.7mm.
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