topic Spread spectrum usage in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-usage/m-p/654031#M100145 <HTML><HEAD></HEAD><BODY><P>Hello,</P><SPAN> </SPAN><P>I am trying to use spread spectrum for the i.MX7D by playing with STOP values according to reference manual formulas&nbsp; but get unreasonable measurements in spectrum analyzer</P><SPAN> </SPAN><P>What is the range that should be set in STOP value?</P><SPAN> </SPAN><P>Thanks</P></BODY></HTML> Wed, 15 Mar 2017 12:04:04 GMT jhones 2017-03-15T12:04:04Z Spread spectrum usage https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-usage/m-p/654031#M100145 <HTML><HEAD></HEAD><BODY><P>Hello,</P><SPAN> </SPAN><P>I am trying to use spread spectrum for the i.MX7D by playing with STOP values according to reference manual formulas&nbsp; but get unreasonable measurements in spectrum analyzer</P><SPAN> </SPAN><P>What is the range that should be set in STOP value?</P><SPAN> </SPAN><P>Thanks</P></BODY></HTML> Wed, 15 Mar 2017 12:04:04 GMT https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-usage/m-p/654031#M100145 jhones 2017-03-15T12:04:04Z Re: iMX7D spread spectrum usage https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-usage/m-p/654032#M100146 <HTML><HEAD></HEAD><BODY><P>Since you use unreasonable STOP value, you see unreasonable result on the PLL output. In your case, the formally calculated spread spectrum range exceeds the PLL output frequency, that has no meaning. For normal operation, the spread spectrum range must be no more than some units of percents of target output frequency. So, try to use some more realistic STOP value that meets the formal calculation criteria.</P><P><BR />Have a great day,<BR />Artur</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Thu, 23 Mar 2017 09:55:54 GMT https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-usage/m-p/654032#M100146 art 2017-03-23T09:55:54Z