LMX1204: LMX1204 output LOGICLKOUT(logic clock) failure issue

milton zhang

Part Number: LMX1204

Tool/software:

LMX1204 output LOGICLKOUT(logic clock) failure issue.

Below is my design. Pin 2/3 is float. I want to output the LOGICLKOUT on pin 27/28. After I configure the LOGIC_EN (R8 register) and LOGICLKOUT_EN(R8 register), and USE DIVIDER（R9 register)）. With PRE-DIV and DIVIDER all set to 4-4. The clock input is 1GHz, but no output signal from LOGICLKOUT on pin 27/28.

What is the problem? Could you help me.

Besides, I also use the LMX1204-EVM board to configure the LOGICLKOUT clock which is the same as my design, again no signa output.

over 1 year ago

0 vicente flores prado over 1 year ago

TI__Mastermind 29402 points

Hi Milton,

Can you attach your configuration (.tcs) file please so we can review?

Regards,

Vicente

0 milton zhang over 1 year ago in reply to vicente flores prado

Prodigy 10 points

5GHZ input, buffer out.tcs

0 milton zhang over 1 year ago in reply to vicente flores prado

Prodigy 10 points

Hi Vicente, Pls see the attached file, in the file, the input clock is 5GHz, the logic clock output is 312.5MHz, which is used on the project.

0 milton zhang over 1 year ago in reply to milton zhang

Prodigy 10 points

Besides, the register configuration is exactly the same as the Hex file exported from TICS Pro, with the register is configured in descending order (largest to smallest address).

0 vicente flores prado over 1 year ago in reply to milton zhang

TI__Mastermind 29402 points

Hi Milton,
I will check this shortly.

Regards,

Vicente

0 vicente flores prado over 1 year ago in reply to vicente flores prado

TI__Mastermind 29402 points

Hi Milton,
I couldn't achieve a 312.5MHz output on LGICLK for some odd reason.
I went ahead and redid the config and was able to get a lock on spectrum analyzer.

Try this config please.

2526.5GHZ input, buffer out.tcs

Regards,

Vicente

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LMX1204: LMX1204 output LOGICLKOUT(logic clock) failure issue