LMX2572: Lock time is over 500us after reloading serial data without changing frequency

Stuart Rumley

Part Number: LMX2572

Tool/software:

Signals below in descending order are: Lock detect, SCK, SDI, and LE. The is from a reload at the same frequency of 21 registers. Lock detect is unlocked for over 500us. Is this the VCO recalibration time?

over 1 year ago

0 Kadeem Samuel over 1 year ago

TI__Mastermind 23280 points

Stuart,

I have assigned someone to this post, please expect a response by Monday worst-case.

Thanks,

Kadeem

0 Noel Fung over 1 year ago in reply to Kadeem Samuel

TI__Guru** 120060 points

Hi Stuart,

If you have FCAL_EN=1, after programming R0, the device will do a VCO calibration. Depending on your configuration, the calibration time + PLL lock time could be 500µs.

Clock & timing

Clock & timing forum

LMX2572: Lock time is over 500us after reloading serial data without changing frequency