LMX2572: The built-in 32 frequency division is turned on, the output 102.4mhz signal appears self-excitation, and its performance is similar to the loss of lock.

Cris Qi

Part Number: LMX2572

Dear TI team,

We use LMX2572 has some questions, would you like give some advice?

When the VCO output frequency is 3276.8mhz. The chip is normally locked.Signal output is normal;However, after the built-in 32 frequency division is turned on, the output 102.4mhz signal appears self-excitation, and its performance is similar to the loss of lock.This phenomenon exists in different reference frequencies and phase discrimination frequencies.After the same pad is replaced with LMX2582RHAR (the pull-up resistance is added to the output pin), the output signal of the same frequency is normal, eliminating PCB board proble

over 5 years ago

0 Noel Fung over 5 years ago

TI__Guru** 107030 points

Hi Cris,

Do you have issue with other division settings?

Could you provide the register setting in TICS Pro format?

Clock & timing

Clock & timing forum

LMX2572: The built-in 32 frequency division is turned on, the output 102.4mhz signal appears self-excitation, and its performance is similar to the loss of lock.