Hi Hiroaki San ADS7951 is designed to work with external reference voltage between 2V to 3V. Please refer to electrical char table on page no. 12 of datasheet. So maximum voltage than can be applied to Vref pin will be 3V. If you are using analog input range of 2 x VREF, then you have to make sure 2 x VREF should be less than or equal to analog power supply VA+. (2 x VREF <= VA+) Please let me know if you need additional information about this Thanks & Regards Abhijeet
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