AD7927: Vdrive voltage

Document created by analog-archivist Employee on Feb 23, 2016Last modified by analog-archivist Employee on Feb 23, 2016
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In page 3 of the datasheet, the specification indicates that the analog input
can be 0~2*REFin. The condition is AVDD/VDRIVE=4.75~5.25V. It requires both
AVDD and VDRIVE to be 5V. However, in the datasheet, it says the Vdrive can be
3V to interface 3V MCU even at AVDD = 5V. Whether the VDRIVE needs to be 5V as
well when he choose 0~2*REFin input range. I used 3V MCU in the system.


There is no need to use the same voltage value for both supplies. The AVDD
should be tied to 4.75-5.25 V but VDRIVE pin can be connected to lower voltage,
for example 3 V.