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Industry: Email Alert RSS FeedSupply voltage measurement and ADC PSRR improvement in MSC12xx devices.(power supply rejection ratio)
EDN Asia, May, 2005 by Gurevich, Michael
This article describes a simple method to compensate for analog supply voltage variations in Texas Instruments MSC12xx devices with one of the unconnected ADC inputs of the [DELTA][SIGMA] ADCs. The ability to measure the supply's voltage change permits the ADC gain to be adjusted, which leads to a better ADC power supply rejection ratio (PSRR). This method is applicable to the MSC12xx and ADS1216 families.
During the [DELTA][SIGMA] ADC conversion cycle, the input signal is sampled on the internal capacitors at the modulation frequency ([F.sub.MOD]). Switching capacitor techniques are then used to compare the input voltage to the integrator voltage, eventually leading to the ADC result. What is important here is that when the next sampling occurs the sampling...
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