LPC MicrocontrollersのトピックADC HS Noise https://community.nxp.com/t5/LPC-Microcontrollers/ADC-HS-Noise/m-p/600150#M23276 <HTML><HEAD></HEAD><BODY><P>Hi guys,</P><P></P><P>we are working with LP4370 an we have some problem regarding correct setup of high speed&nbsp;adc. our test with only one channel active, drived by a descriptor . we shorted ref neg with input and we supplied the reference with an external source at 500mV</P><P></P><P>In another tentative we had tried to connect adc ref to internal refneg but we haven't seen any changes</P><P></P><P>in a third tentative we connected to input a function signal generator programmed with ouput dc values. Changing output values of signal generator modify the adc output value correctly, but we have still a lot of noise.</P><P></P><P>The resul of our test is a noise and the value read by adc was +/- 100 points but we expected to read a costant values.&nbsp;May be our setup isn't good so I would like to know the best setup for 12 bit adc.</P><P></P><P>Best Regards</P><P>Giuseppe Monteleone</P></BODY></HTML> Mon, 20 Mar 2017 18:38:01 GMT gmonteleone 2017-03-20T18:38:01Z ADC HS Noise https://community.nxp.com/t5/LPC-Microcontrollers/ADC-HS-Noise/m-p/600150#M23276 <HTML><HEAD></HEAD><BODY><P>Hi guys,</P><P></P><P>we are working with LP4370 an we have some problem regarding correct setup of high speed&nbsp;adc. our test with only one channel active, drived by a descriptor . we shorted ref neg with input and we supplied the reference with an external source at 500mV</P><P></P><P>In another tentative we had tried to connect adc ref to internal refneg but we haven't seen any changes</P><P></P><P>in a third tentative we connected to input a function signal generator programmed with ouput dc values. Changing output values of signal generator modify the adc output value correctly, but we have still a lot of noise.</P><P></P><P>The resul of our test is a noise and the value read by adc was +/- 100 points but we expected to read a costant values.&nbsp;May be our setup isn't good so I would like to know the best setup for 12 bit adc.</P><P></P><P>Best Regards</P><P>Giuseppe Monteleone</P></BODY></HTML> Mon, 20 Mar 2017 18:38:01 GMT https://community.nxp.com/t5/LPC-Microcontrollers/ADC-HS-Noise/m-p/600150#M23276 gmonteleone 2017-03-20T18:38:01Z