4DSP Support Forum
Products => FMC Products => FMC150 => Topic started by: Avdbyl on May 20, 2014, 05:54 AM
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(This is a repost since the first once was posted with a small font!)
Hi all,
I hope someone can shed some light on this for me. I am working with an FMC150, and need to supply an external clock for the ADC. I have followed the datasheet, and run many different configurations, but I have had no luck in getting a clock into the ADC when using the External Clock input. I have included the configuration words below for each register in the CDCE72010 (they are written to the CDCE72010 by an FPGA – I have verified the writing process is correct, as changing configurations e.g. output division, enable/disable of the VCXO etc. is successful). Since the system configuration is simple (clock input to the FMC card; OUT_MUX to AUX IN (to output dividers); Output 2 divider enabled (div by 1 in this case); and output 2 buffer type set to LVPECL. If I configure for this, and supply an appropriate clock source (an Agilent signal generator at 175MHz at 3dBm into 50 Ohms), I get no response from the ADC. What could be the problem?
Thanks,
Andrew
Configuration Words:
683C0250,
68000271,
83400002,
68000003,
E9800004,
68000005,
68000006,
83400007,
680001D8,
680500C9,
05FC270A,
8200040B,
60009B0C;
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