What's the lowest ADC reference voltage I can use for  the LPC1114 ?

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by UncleJoe on Sun Jun 22 15:01:15 MST 2014
I'm wondering if I can directly measure the heart's  ECG with a micro controller.

I need very high accuracy (in the sub mV range), but very low bandwidth. I've tried putting together a circuit with the ADC voltage reference (VDDA) set to 0.1V, but no matter what, my ADC readings are always 1023.

I don't see the minimum reference voltage mentioned in the documentation. Is there one?