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LPC1778 Spread Spectrum Clock input?

Question asked by Adam Garrison on Mar 2, 2017
Latest reply on Mar 6, 2017 by Kerry Zhou

We are having emissions failures using the LPC1778 and I am looking at using a SSCG (Spread Spectrum clock generator) to help combat this.

 

Will the LPC1778 work with an SSCG, have they tried it?

 

If so, do they recommend a certain SSCG to use?

 

Reading the datasheet the Xtal1 pin can only handle max 1.95(or 1.85V) on it and most SSCG are outputting 3.3V. I can use a series cap and a cap to gnd to get the amplitude down, but wondering if this will affect he SS clock coming out of the SSCG? With 100pf in series and 100pf to GND that should give me 1.65V in.

 

Thank you,

Adam

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