[size=1.35em][font=arial](This is a repost since the first once was posted with a small font!) [/font][/size] [size=1.35em][font=arial]Hi all,[/font][/size]
[size=1.35em][font=arial]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?[/font][/size]
Customer
[/font][/size]
[size=1.35em][font=arial]Hi all,[/font][/size]
[size=1.35em][font=arial]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?[/font][/size]
[size=1.35em][font=arial]Thanks,
[/font][/size]
[size=1.35em][font=arial]Andrew[/font][/size]
[size=1.35em][font=arial]Configuration Words:[/font][/size]
[size=1.35em][font=arial]683C0250,
[/font][/size]
[size=1.35em][font=arial]68000271,
[/font][/size]
[size=1.35em][font=arial]83400002,
[/font][/size]
[size=1.35em][font=arial]68000003,
[/font][/size]
[size=1.35em][font=arial]E9800004,
[/font][/size]
[size=1.35em][font=arial]68000005,
[/font][/size]
[size=1.35em][font=arial]68000006,
[/font][/size]
[size=1.35em][font=arial]83400007,
[/font][/size]
[size=1.35em][font=arial]680001D8,
[/font][/size]
[size=1.35em][font=arial]680500C9,
[/font][/size]
[size=1.35em][font=arial]05FC270A,
[/font][/size]
[size=1.35em][font=arial]8200040B,
[/font][/size]
[size=1.35em][font=arial]60009B0C;[/font][/size]