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PCM1863: PCM1863 VINL1/VIN1P PIN input range

Hollis Liu
Intellectual 2585 points
Part Number: PCM1863

Hi team, 

I wants to know the PCM1863 VINL1/VIN1P PIN input range when it is configured as single-ended mode. In datasheet 7.1 Absolute Maximum Ratings, VINxx to AGND voltage should be in the range of -1.7V ~ 5V. 

But in EVM test, we found the VINL1 can tolerate 10V(peak to peak) input when we set the PGA to be -12dB  when it is configured as single-ended mode. Is that normal?

If yes, I want to know why the PIN can tolerate so high voltage when the VCC power voltage is 3.3V. Thanks. 

 

  • 0
    TI__Mastermind 23050 points

    Hi Hollis,

    The PCM186x actually has an internal attenuator on the input, which is why the abs max ratings extend well below ground and above the 3.3V supply rail. This is how the 2.1Vrms swing is achieved in single-ended mode. There is still some additional margin and the integrated PGA does have the ability to attenuate the input signal further. However, I still wouldn't recommend operating outside of the max ratings as this could potentially degrade the input cells over time and eventually result in damage to the device.

    Best,

    Zak