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DC coupling to AD9467

Question asked by amess on Mar 28, 2013
Latest reply on Jun 28, 2013 by aveiga

In my application I have a photo detector voltage that I need to sample. I need good resolution and low latency, but my input is basically DC and requires a high impedance load (no more than 10K). The AD9467 seems to be well matched for my application, but I need to design the interface circuit. Initially my thoughts are to have a unity gain OPAMP to provide the high impedance input, and use a differential buffer like the ADL5562 to DC-couple to the ADC. Any advice from folks who have done similar circuits would be greatly appreciated.

 

(I say the signal is basically DC, but I must measure very small fluctuations at about 200 MSPS).

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