What's the input resistance of ADA8691?

Hi,

I'm trying to connect the ADA8691 amplifier with ADMP411 microphone, but I can't find the input resistance of the amplifier. Thanks,

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  • 0
    •  Analog Employees 
    on Jul 30, 2013 5:13 PM over 7 years ago

    Hi hulala,

    Just to follow up with this.. I heard back from the engineer of this part. The AD8691 is one of the older parts so unfortunately, it does not have Rin specs. However, its Ibias spec of 1pA should clue you in that it has very high input impedance. It is safe to assume a value in the high Mohms or Gohms range.

    I hope this helps!

    Kris

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  • 0
    •  Analog Employees 
    on Jul 30, 2013 5:13 PM over 7 years ago

    Hi hulala,

    Just to follow up with this.. I heard back from the engineer of this part. The AD8691 is one of the older parts so unfortunately, it does not have Rin specs. However, its Ibias spec of 1pA should clue you in that it has very high input impedance. It is safe to assume a value in the high Mohms or Gohms range.

    I hope this helps!

    Kris

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