https://community.nxp.com/t5/LPCXpresso-IDE/LPC-1114-ADC-Interface/m-p/583174#M25747 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by diodedan on Sat Sep 18 18:23:40 MST 2010</STRONG><BR /><SPAN>Hello,</SPAN><BR /><BR /><SPAN>I have two questions:</SPAN><BR /><BR /><SPAN>1) It looks like the ADC of the LPC 1114 is only a single supply ADC (no differential mode). Is this true, or am I missing something?</SPAN><BR /><BR /><SPAN>2) I am using a single supply analog system referenced at Vcc/2 (3.3/2&nbsp; = 1.65V). I would like to have my output codes read as if they were referenced at zero. I am thinking that at startup, I should read the ADC a few times, average it, and use this as a constant factor to subtract from my ADC reading.</SPAN><BR /><BR /><SPAN>Does anyone have any suggestions/experience with this matter?</SPAN><BR /><BR /><SPAN>Thank you,</SPAN><BR /><SPAN>Diodedan</SPAN></BODY></HTML> Thu, 16 Jun 2016 00:03:55 GMT lpcware 2016-06-16T00:03:55Z https://community.nxp.com/t5/LPCXpresso-IDE/LPC-1114-ADC-Interface/m-p/583174#M25747 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by diodedan on Sat Sep 18 18:23:40 MST 2010</STRONG><BR /><SPAN>Hello,</SPAN><BR /><BR /><SPAN>I have two questions:</SPAN><BR /><BR /><SPAN>1) It looks like the ADC of the LPC 1114 is only a single supply ADC (no differential mode). Is this true, or am I missing something?</SPAN><BR /><BR /><SPAN>2) I am using a single supply analog system referenced at Vcc/2 (3.3/2&nbsp; = 1.65V). I would like to have my output codes read as if they were referenced at zero. I am thinking that at startup, I should read the ADC a few times, average it, and use this as a constant factor to subtract from my ADC reading.</SPAN><BR /><BR /><SPAN>Does anyone have any suggestions/experience with this matter?</SPAN><BR /><BR /><SPAN>Thank you,</SPAN><BR /><SPAN>Diodedan</SPAN></BODY></HTML> Thu, 16 Jun 2016 00:03:55 GMT https://community.nxp.com/t5/LPCXpresso-IDE/LPC-1114-ADC-Interface/m-p/583174#M25747 lpcware 2016-06-16T00:03:55Z https://community.nxp.com/t5/LPCXpresso-IDE/LPC-1114-ADC-Interface/m-p/583175#M25748 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Ex-Zero on Sat Sep 18 19:11:18 MST 2010</STRONG><BR /><SPAN>@1: You're right, unfortunately no differential input.</SPAN><BR /><SPAN> </SPAN><BR /><SPAN>@2: You could use 2 inputs to read voltage / reference voltage and then just subtract them (that's differential, too).</SPAN></BODY></HTML> Thu, 16 Jun 2016 00:03:56 GMT https://community.nxp.com/t5/LPCXpresso-IDE/LPC-1114-ADC-Interface/m-p/583175#M25748 lpcware 2016-06-16T00:03:56Z