'high res adc or similar -Reply'
Try an op-amp prescale with gain of 25. The 200 mV X 25 = 5V and 10uV X 25 =
250 uV. If you don't want to dither the signal as mentioned in another post
you'll need at least a 15 bit converter but with the prescale you'll have a
5V signal to work with.
Of course you may have left out info that would preclude this as a viable
solution so YMMV
>>> Peter Grey <OZEMAIL.COM.AU> 7 March 1997 8:57 am >>> martech
I wish to use a pic to determine a signal which has a resolution of 10
microvolts in 200 millivolts. It also has a requirement for any component to
be in a very small package (ie surface mount and preferably in an 8-pin
SOIC). I can get a 16 bit ADC but the range is usually that of the supply
rail to ground. If I was to look at 10 microvolts in 5 volts then a 20 bit
ADC would be needed. As you can see I would need serial I/O for the digital
side. The ideal solution would be the LTC1298 but with a resolution of 20
Any ideas would be appreciated.
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