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PCM3060: Analog input pins min/max voltage

Josh B
Prodigy 40 points
Part Number: PCM3060

I'm confused by the datasheet.

For VinL and VinR it states an absolute max rating of –0.3 to (VCC + 0.3 V) < 6.5
These inputs are AC coupled though so are these the maximum values with the internal bias applied? or is it just the peak-to-peak voltage range?,

Also in section ANALOG INPUTS TO ADC it says "These are single-ended (unbalanced) inputs,
each capable of 0.6-VCC Vpp input with 10-kΩ input resistance, typically." Let's assume Vcc is 5V, does this mean 4.4 Vpp is allowed?

Best

  • 0
    TI__Genius 16340 points

    Hello Josh,

    Thank you for reaching out. 

    The Absolute maximum ratings are the maximum voltage that the pins can sustain without damage to the device. This would be the voltage seen at then pin and would not include the internal bias. 

    The spec of VCC*0.6 is the full-scale voltage. This is the signal that will result in the maximum digital value from the ADC (that is, all 1's). Assuming Vcc=5V, VCC*0.6=3Vpp. While a 4.4Vpp signal does not violate the Abs Max conditions (and therefore will not damage the device) the signal will be "clipped" or distorted since this is larger than the full-scale reading. 

    I hope this helps.

    Best,
    Andrew