Part Number: ADS52J90
Dear support team,
I am developping and testing for a customer a new 32 analog inputs FMC board, which has 2 ADSJ90 on it. The board is plugged on a carrier, where the FPGA controling the acquisition lies.
The prototypes are running as expected, except that sometimes, I see a strange spectrum signature on all channels. This happen for acquisitions at 25 MSa/s and fin = 10 MHz (in reallity 9.99794006347656 MHz) . Attached is a FFT plot issued from HSDC Pro and the corresponding ADC data. There are 2 "frequency square", are the left side of the 5 and 10 MHz lines. The ADC is running in 14-bit mode, with zero padding to 16-bit.
Could your ADC expert have an idea of what could produce this strange spectrum signature? It seems to be a "digital/logic" problem. It would help a lot.
Kind regard, Jean-Luc
