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Register configuration for AUX CLK on CDCE72010

Other Parts Discussed in Thread: CDCE72010

Hello, I am using the SPI port to control a cdce72010. My goal is to take in the AUX CLK input and use it to drive the dividers directly, leaving the pll off and the FB divider off. My registers are programmed to the values below (read back from the device), but I do not get a clock out of the part at all in this mode. I have successfully configured it for an 800mhz vcxo and a 100mhz primary reference and secondary reference, but the ext clk just doesn't seem to work. Any insight is greatly appreciated.

READ: Addr = 0, reg val = 0x683C0310

READ: Addr = 1, reg val = 0x68000020

READ: Addr = 2, reg val = 0x83060002

READ: Addr = 3, reg val = 0x68000002

READ: Addr = 4, reg val = 0xE9800004

READ: Addr = 5, reg val = 0x68000004

READ: Addr = 6, reg val = 0x68000006

READ: Addr = 7, reg val = 0x83400016

READ: Addr = 8, reg val = 0x68000098

READ: Addr = 9, reg val = 0x68050CC8

READ: Addr = 10, reg val = 0x09C0270A

READ: Addr = 11, reg val = 0x8280044A

READ: Addr = 12, reg val = 0x60009B0C

  • Hi Michael,

    Can you try these register settings to see if this helps? Are you using the GUI and EVM? If so, you can load this directly to see if it solves the problem. I noticed the last bit in your register settings does not always match the register number (i.e. Addr1 should end in 1).

    Best regards,

    Matthttp://e2e.ti.com/cfs-file.ashx/__key/CommunityServer-Discussions-Components-Files/48/7026.CDCE72010_5F00_ext_5F00_aux.ini