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PCM2906C: VCCCI input voltage threshold

Part Number: PCM2906C

Hi,

The datasheet states that the analog performance of the ADC may be degraded when using an internal voltage regulator.

It seems that the internal voltage regulator turns off when power is supplied externally to the VCCCI pin using an external voltage regulator, but what is the voltage threshold at which it turns off?

I was wonder if you could reply quickly?

Best regards,

Shiga