Forum Post: RE: ADS124S08: Using TPSM82912 and LM27762 as powersupply for bipolar adc setup with mcu

Hi Johannes Maier, Thanks for providing additional background. The TI reference design you linked to should work well for your power supply design. The LM27762 has built-in LDOs so the analog supplies should be clean I would recommend an LDO on DVDD, you don't want a lot of noise/ripple getting into the digital circuitry The ADS124S08 is generally intended for DC measurements, so ensure that you understand the integrated filter response if you want to measure AC signals. the sinc filter has low bandwidth and lots of passband droop, so it is not ideal for AC signals. However, the ADS124S08 is really designed for RTD measurements, so that is the right choice for temperature measurements I don't think there should be an issue using the same supply for analog and digital, as long as the source is clean i.e. has an LDO. However, since you are using bipolar supplies this is really a non-issue. You can see that the ADS124S08EVM can use the same supply as DVDD, IOVDD, and AVDD, as shown in the image below -Bryan