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Original question:

PCM1808-Q1: definition of "Center voltage Input range"

PCM1808-Q1: About center voltage input range.

user5861762
Intellectual 370 points
Part Number: PCM1808-Q1

Hi,

Please tell me about the center voltage input range.

The data sheet describes a minimum of 0.2Vcc and a maximum of 0.8Vcc.

Is this the range of variation of the Vref voltage built into the IC?

If this is the case, then Vref = 0.8VCC = 4V.

The absolute maximum rating of the Analog Input is about 5V at maximum, which means that the input voltage can only be 4V±1V.
Does this mean that even if I input an AC couple, I can only input up to 1Vp-p?

Best Regards,

Hirashima

  • 0
    TI__Genius 13610 points

    Hello,

    No Vref is equal to .5Vcc.

    Center voltage refers to DC bias at input where it needs minimum of .2Vcc but max of .8Vcc

    In case of nominal if Vcc = 5V. The nominal DC bias would be 2.5V and your input is 3Vpp which does not break any max ratings.

    Best Regards,

    Carson