Radiated emissions from Audio Clock

ganeshskandha — Wed, 04 Oct 2017 08:26:43 GMT

Hi,

I have a custom board with IMX6 and SGTL5000 with Audio clock running at 11.29MHz, there are emissions from the 6th, 7th harmonics from this clock. The clock is provided by GPIO00

I have tried increasing the drive strength and controlling the slew rate with no promising effect ?

Is there any thing to be taken care in the layout/ schematics for this audio codec routing ?

Thanks,

Ganesh

Re: Radiated emissions from Audio Clock

igorpadykov — Wed, 04 Oct 2017 23:15:42 GMT

Hi Ganesh

for decreasing emissions it is necessary to decrease drive strength and slew rate.

For layout rules one can check i.MX6 System Development User’s Guide

https://www.nxp.com/docs/en/user-guide/IMX6DQ6SDLHDG.pdf

Best regards
igor
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topic Radiated emissions from Audio Clock in i.MX Processors

Radiated emissions from Audio Clock

Re: Radiated emissions from Audio Clock