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AD7631 power supply problem

After provided the power supply to AD7631 VCC=+12V, VEE=-12V, AVDD=DVDD=+5V,
OVDD=+3.3V, I tested the voltage at the AD7631 power supply pins. I found that
the voltage at OVDD is 4.3V rather than 3.3V. When I disconnected the power
supply to OVDD, I found there was a 4.6V voltage at this pin. I wondered why
the voltage at OVDD was changed. Is there any potential problem if it is not


Do not connect TEN,BIPOLAR with 5V voltage level.  Change to 3.3V level.