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Query about ADF4107's SPI port

Question asked by WayneQ on Aug 25, 2014
Latest reply on Sep 4, 2014 by WayneQ

Hi, there

 

I have some test on ADF4107 these days and find some interesting things.

When ADF4107 locks well, I set any one of SPI port high - CLK, LE, SDI. Then power off ADF4107, the one of SPI is still high.

After a while, ADF4107 powered on, the PLL locks again in previous frequency. Seems the register part is powered on by the high level of SPI port.

When ADF4107 locks well, I pull down all SPI ports - CLK, LE, SDI. Then power off ADF4107, the SPI ports are all low of course.

After a while, ADF4107 powered on, the PLL doesn't lock. We need to re-write to ADF4107.

My doubt here is the internal registers of ADF4107 can be power by SPI port?

 

Thanks!

 

Br,

Wayne

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