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Tatsumi-san,
As stated in the datasheet, EN, AGC1 and AGC2 support a maximum voltage range from -0.3V to 6V and they are not dependent of VDD. By other hand, the analog inputs INR+, INR-, INL+ and INL- depend of the VDD level, and you would need to pay attention to their voltage level when AVDD is disabled.
http://www.ti.com/lit/ds/slos584/slos584.pdf#page=3
I hope this helps you. Please let me know if you have additional questions or comments.
Best regards,
Luis Fernando Rodríguez S.
This is Tatsumi-san's customer and he has submitted this question on my behalf.
My question has been resolved by your explanation. Thank you very much and currently I have no additional question.
Best regards,
Atsushi HANZAWA
SHARP Corporation