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AD9625(FMCADC2) DIGITAL OUTPUT

Question asked by mutual.jun on May 18, 2018

Hello,

I have a question. The sampled data(2's complement setting) is not what I expect.

I generated 0 dBm 500 MHz CW signal (Agilent 83623B). 0 dBm is approximately 0.3 Vpeak.

But I obtain max from 295 to -275(varing). Although It is not an exact power, the calculations show that:

Measure: V ref * (sample value / resolution) = 1.2V * (295/2048) = 0.1728xxx V

It might have miscalculated. Let me know If you know.

Anyway, I think something wrong when I configure the FMCADC2 Initialize code(SPI register).

Give me a hand.

AD9625 configuration

Sincerely

Jun.

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