Radiated emissions from Audio Clock

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Radiated emissions from Audio Clock

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ganeshskandha
Contributor I

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

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igorpadykov
NXP TechSupport
NXP TechSupport

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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