Simple 4 Bit ADC?

[gstopp at fibermux.com]

     I can think of two ways - first, you can make a textbook A/D converter 
     with a 4-bit counter, a 4-bit latch, a 4-bit R-2R ladder DAC made from 
     a handful of resistors, and a comparator. The conversion time will be 
     fast but finite, limited by the clock rate of the counter and the slew 
     rate of the comparator.
     
     Second, you can make a flash converter out of op-amps. This type of 
     converter has a much faster conversion time, but uses a whole bunch of 
     different valued resistors. There's a schematic for exactly this (a 
     4-bit converter) in an old issue of "Polyphony", which I can dig up if 
     you want.
     
     - Gene
     gstopp at fibermux.com


______________________________ Reply Separator _________________________________
Subject: Simple 4 Bit ADC?
Author:  "A.S.P." <ms20 at serv.net> at ccrelayout
Date:    2/4/97 6:03 PM

     Can someone point me to a simple circuit that will convert 0 to 10 vDC 
     to a 4 bit digital output?