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Max Capacitive load

Category: Datasheet/Specs
Product Number: ADUM4195-1

Dear Export,

In the datasheet of ADUM4195-1 I read that the max capacitive load is 100pF:

Is this true in a sense that if I want to put an RC filter with 1k and 10nF on the output of the

ADUM4195-1 the amplifier might not be able to drive it ot the 1k resistor isolates it?

I attach here the photo:

Thanks and regards,

Andras Magyar

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  • Hello Andras,

    Thanks for the question. The main point about the 100 pF was to preserve the bandwidth on the output of the ADuM4195-1. Since you are creating a lowpass filter, you obviously want to edit the bandwidth response of the system. depending on where the node at the RC connects to next, you could be "datasheet compliant" by using a smaller cap, and a larger resistor to achieve the same RC constant, or you could buffer the output. In any case, your circuit should be fine, even with the larger cap, but just know that the bandwidth will be affected.

    Thanks,

    RSchnell

Reply
  • Hello Andras,

    Thanks for the question. The main point about the 100 pF was to preserve the bandwidth on the output of the ADuM4195-1. Since you are creating a lowpass filter, you obviously want to edit the bandwidth response of the system. depending on where the node at the RC connects to next, you could be "datasheet compliant" by using a smaller cap, and a larger resistor to achieve the same RC constant, or you could buffer the output. In any case, your circuit should be fine, even with the larger cap, but just know that the bandwidth will be affected.

    Thanks,

    RSchnell

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