ADS42JB49: Spurs at Sampling rate

Vladimir Anishchenko

Part Number: ADS42JB49

Hello,

We have an issue with our design - spurs, which are an interger to ADS42JB49 actual sampling rate (CLKIN by Internal devider), are seen everyware on PCA. Additional coupling capacitors on power supply rails do not help. Does anybody have any suggestions?

Thank you in advance.

over 6 years ago

0 Neeraj Gill over 6 years ago

TI__Mastermind 20541 points

Hi Vladimir,

We are looking into question. We will get back to you as soon as I can.

Regards,
Neeraj

0 jim s over 6 years ago in reply to Neeraj Gill

TI__Guru* 91947 points

Vladimir,

Did you turn off SYSREF going to the ADC after the JESD link has been established? What is the frequency of the input clock? Is it filtered? What is sourcing it? What is the amplitude and frequency of the analog input? Is this signal filtered?

Regards,

Jim

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ADS42JB49: Spurs at Sampling rate