LMX2571EVM: Dithering feature not working

Vishnu R

Prodigy 180 points

Part Number: LMX2571EVM
Other Parts Discussed in Thread: LMX2571

Hi,

I've been working on the evaluation board for LMX2571.

It seems that the dither feature is not working in the PCB.

The phase noise profile and the spur levels remain the same, even when the dither is enabled.

Regards,

Vishnu R.

over 6 years ago

0 Noel Fung over 6 years ago

TI__Guru* 88030 points

Hi Vishnu,
Dithering is useful to reduce fractional and sub-fractional spurs. If your configuration does not have these spurs, you will not see the difference after enabling it.

0 Vishnu R over 6 years ago in reply to Noel Fung

Prodigy 180 points

Yes definitely I was looking for the reduction in fractional spur levels. I tuned to 480.1MHz and was trying to reduce the fractional spurs at 100kHz and it's multiples.

0 Noel Fung over 6 years ago in reply to Vishnu R

TI__Guru* 88030 points

Hi Vishnu,

What is your reference clock frequency?

Clock & timing

Clock & timing forum

LMX2571EVM: Dithering feature not working