Vasile Surducan wrote: >On 10/6/05, Aaron wrote: > > >>Vasile Surducan wrote: >> >> >> >>>If you have played a little with Maxims high speed AD converters you >>>know how important is to keep the analog voltage slighty above the >>>digital one. >>> >>> >>> >>> >>> >>Can you clarifiy this?? >> >> > >Yes, a serious AD converter have both analog supply pins entirely >separate by the digital supply pins. GND and Vcc. To get a reasonable >SNR at high speed conversion, those two supplies are separed and >usually the analogic voltage supply(3V) is bigger than the digital >voltage supply (2.5V). >The values are just for example, on thickest technology chips are >lower (0.9V-1.8V). > >Vasile > > > Oh, the analog supply....got it! I was trying to figure out how to keep the analog voltage one was trying to measure above your digital voltage... Aaron -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist