i.MX Processors中的主题 Re: about ADC sampling clock-2 https://community.nxp.com/t5/i-MX-Processors/about-ADC-sampling-clock-2/m-p/997719#M147989 <HTML><HEAD></HEAD><BODY><P>Hi Goto</P><SPAN> </SPAN><P></P><SPAN> </SPAN><P>&gt;Is it OK to make the RIEXT value larger than 250Ω..</P><SPAN> </SPAN><P></P><SPAN> </SPAN><P>not, sorry.</P><SPAN> </SPAN><P></P><SPAN> </SPAN><P>&gt;What kind of problems will occur if the resistance value is increased?</P><SPAN> </SPAN><P></P><SPAN> </SPAN><P>it may affect measurement accuracy, details can be found on web, for example :</P><SPAN> </SPAN><P><A class="link-titled" href="https://electronics.stackexchange.com/questions/107741/required-output-impedance-for-adc-input" title="https://electronics.stackexchange.com/questions/107741/required-output-impedance-for-adc-input">Required output impedance for ADC input? - Electrical Engineering Stack Exchange</A>&nbsp;</P><SPAN> </SPAN><P><BR />Best regards<BR />igor<BR />-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Sat, 02 Nov 2019 07:55:58 GMT igorpadykov 2019-11-02T07:55:58Z about ADC sampling clock-2 https://community.nxp.com/t5/i-MX-Processors/about-ADC-sampling-clock-2/m-p/997718#M147988 <HTML><HEAD></HEAD><BODY><P style="color: #51626f; background-color: #ffffff; border: 0px;"><SPAN style="color: #51626f; background-color: #ffffff; border: 0px; font-weight: inherit;">hello,</SPAN></P><SPAN> </SPAN><P style="color: #51626f; background-color: #ffffff; border: 0px;">&nbsp;</P><SPAN> </SPAN><P style="color: #51626f; background-color: #ffffff; border: 0px;">Table 93. Recommended operating conditions for 12-bit ADC in .MX 7 Dual Family of Applications Processors Datasheet<BR />Is it OK to make the RIEXT value larger than 250Ω (for example, from several kΩ to d<SPAN lang="en" style="border: 0px; font-weight: inherit;">ozens of&nbsp;</SPAN>kΩ) when FCLK and FSOC are operated at close Min values?</P><SPAN> </SPAN><P style="color: #51626f; background-color: #ffffff; border: 0px;">What kind of problems will occur if the resistance value is increased?</P><SPAN> </SPAN><P style="color: #51626f; background-color: #ffffff; border: 0px;">&nbsp;</P><SPAN> </SPAN><P style="color: #51626f; background-color: #ffffff; border: 0px;"><SPAN style="color: #51626f; background-color: #ffffff; border: 0px; font-weight: inherit;">best regards</SPAN></P><SPAN> </SPAN><P style="color: #51626f; background-color: #ffffff; border: 0px;"><SPAN style="color: #51626f; background-color: #ffffff; border: 0px; font-weight: inherit;">Goto</SPAN></P></BODY></HTML> Sat, 02 Nov 2019 04:45:10 GMT https://community.nxp.com/t5/i-MX-Processors/about-ADC-sampling-clock-2/m-p/997718#M147988 goto11 2019-11-02T04:45:10Z Re: about ADC sampling clock-2 https://community.nxp.com/t5/i-MX-Processors/about-ADC-sampling-clock-2/m-p/997719#M147989 <HTML><HEAD></HEAD><BODY><P>Hi Goto</P><SPAN> </SPAN><P></P><SPAN> </SPAN><P>&gt;Is it OK to make the RIEXT value larger than 250Ω..</P><SPAN> </SPAN><P></P><SPAN> </SPAN><P>not, sorry.</P><SPAN> </SPAN><P></P><SPAN> </SPAN><P>&gt;What kind of problems will occur if the resistance value is increased?</P><SPAN> </SPAN><P></P><SPAN> </SPAN><P>it may affect measurement accuracy, details can be found on web, for example :</P><SPAN> </SPAN><P><A class="link-titled" href="https://electronics.stackexchange.com/questions/107741/required-output-impedance-for-adc-input" title="https://electronics.stackexchange.com/questions/107741/required-output-impedance-for-adc-input">Required output impedance for ADC input? - Electrical Engineering Stack Exchange</A>&nbsp;</P><SPAN> </SPAN><P><BR />Best regards<BR />igor<BR />-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Sat, 02 Nov 2019 07:55:58 GMT https://community.nxp.com/t5/i-MX-Processors/about-ADC-sampling-clock-2/m-p/997719#M147989 igorpadykov 2019-11-02T07:55:58Z