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AD8015 and APD

Question asked by paul_123 on Oct 8, 2015
Latest reply on Oct 12, 2015 by paul_123



I want to use the AD8015 together with an APD. I have attached a drawing of the circuit diagram.

The APD has approx. 0.5pF and I want to reach a signal frequency of 100MHz.

I use approx. the circuit from Figure 16 from the datasheet (page 7).


My questions are:

1. What is the linear/max. input DC current at the input (Iin, Pin 2) of AD8015?

     On page 2 (datasheet) is written a Linear Input Current Range of +/- 30µA, is this value also valid for DC?


2. What happens if the APD draws more current as the 30µA? What is the purpose of the INPUT CLAMPS?


Thanks a lot,