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AD9467 rms noise

Question asked by ccruztorre on Nov 6, 2017
Latest reply on Jan 9, 2018 by ccruztorre

Dear Umesh,  I would like to explain the problem about the noise obtained from the AD9467 evaluation board:

I am using FMC AD9467 250MSPS ADC for sampling 200KHz signal as input with the ZC706 zynq FPGA. The ADC is being operated at 250MSPS sampling rate and I capture million samples correctly. I am using the AIN inverted input with the ADL 5562 amplifier (configured for obtaining a gain value 1) for the AD9467 ADC input.The problem comes from the noise because I obtain 10 ADU rms noise when no signal is connected to the input (50ohm). It is a very high noise.

Could this noise come from the ADC clock? A sine signal 240Mhz obtained from a signal generator was used for connecting  to the CLK input ADC board.Have you got any comments or suggestion to do? Should I use the ad9517 to clock the ad9467 on the AD9467-FMC-250EBZ board?

Thanks in advance