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I have a quick question for an analog circuit that is low frequency. I am implementing a PH meter that is reading a voltage from a probe (that is a very low current battery). It is amplified by a TI LMP91200 opamp and then sent to the delSig (at 16 bit, 200k sps with bypass cap). I was going to put RC filters on the inputs to block some noise coming from switching power supplies, etc. Can someone recommend a good set of R and C values for this? is this even necessary?
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jasonkahana,
AFAIK, a PH meter sensor is slow-responce (seconds). There is no need for 200kHz sampling rate.
Second, analog front end has nothing to do with PSoC, you need to refine it separately.
/odissey1
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what is the frequency of the input signal and the frequency of the noise coming from switching power supplies?
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jasonkahana,
AFAIK, a PH meter sensor is slow-responce (seconds). There is no need for 200kHz sampling rate.
Second, analog front end has nothing to do with PSoC, you need to refine it separately.
/odissey1