AD7631 power supply problem

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

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AD7631 Production
The AD7631 is an 18-bit, charge redistribution, successive approximation register (SAR), architecture analog-to-digital converter (ADC) fabricated on Analog...
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AD7631 on Analog.com