Anonymous
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May 22, 2015
10:09 AM
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May 22, 2015
10:09 AM
Hi I'm having problems reading a DC high Z signal at the analog opamp ports on the kit while acquiring it for Delsig ADC, I buffered the analog signal in a follower opamp / buffer PGA with no luck so far, what would be the best solution to deal with the high impedance? Will resistors (10M or higher) be enough or I still need an external fA opamp. I'm so far stuck and still unconvinced with the analog specs of PSoC. I'd appreciate your help. Thanks
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PSoC 5LP
2 Replies
May 22, 2015
11:35 AM
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May 22, 2015
11:35 AM
The input impedance of an analog input is comparably high, so no need to put a resistor into the path.
Input leakage current (see pins datasheet) for a GPIO-pin is 2 nA @3V which is 1.5GOhms.
Bob
May 22, 2015
12:05 PM
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May 22, 2015
12:05 PM
Post a schematic, or an image of, including the sensor hookup, that way we
can help you.
Regards, Dana.