Jan-Erik Soderholm writes: > If you use an external ADC reference of 1.024 V Not if you are using a PIC for your ADC! The limit for ADC reference voltage is nowhere near that low, on any PIC available. -Bob -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist