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PCM4222: Voltage clamping for ADC inputs?

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Part Number: PCM4222

The IC has overflow channel indicators but no description of thresholds which activate this. The absolute maximum analog input voltage is 6V. The evaluation board PCM4222EVM schematics shows no input clamps.

1) Is there internal clamping in the PCM4222?

2) If not - what method of clamping the inputs is suggested?

I would think clamping to 4V would be advisable given the 2.8Vpp on 1.95Vcom

Thanks

  • Hi, Shawn,

    The overflow flags of the PCM4222 are used to indicate whenever a digital overflow event is detected. This might occur when the analog input exceeds the full scale voltage spec, that is 5.6Vpp for each differential input pair (or 2.8Vpp on each pin). As mentioned in the datasheet, clamping is only recommended in the analog input circuitry if the input voltage is expected to exceed the absolute maximum analog input voltage ratings. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

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