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PCM1803A: PCM1803A - full scale voltag

Part Number: PCM1803A
Other Parts Discussed in Thread: PCM1803

Dear sir or madam,

In DEM-DAI1803EV schematics, VREF2 of PCM1803 is connected to VCC but datasheet just talks about decoupling it.

So, is it necessary to connect it to VCC?

Is it possible to connect it to an external Voltage Reference(e.g. REF 02) for better accuracy?