Hi Adachi-san, There are no specific requirements for AVDD/DVDD slew rate. Since AVDD is also used as the reference voltage to the ADC, it is recommended to use a linear voltage regulator over a switching regulator. An LDO or precision voltage reference works best. I suggest something comparable in performance or better than the TPS78001, which is the LDO used in the BP-ADS7128, the EVM for the ADS7128. Regards, Joel
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