Jun 26, 2014
04:56 AM
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Jun 26, 2014
04:56 AM
Hello,
In one of my projects, I wanted to connect a DAC acting as a reference voltage source (Vref) directly to the Vref input of a PGA component.
I just wanted to know is that is a good idea in terms of interfacing the two components together since I didn't find much about the input resistance of the PGA.
The VDAC has a 4kOhm typical value for the 1.024V range, so the PGA has to be at least 10 times that to be considerable (I think).
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PSoC 5LP
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Jun 26, 2014
05:12 AM
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Jun 26, 2014
05:12 AM
The datasheet has the nominal value of the G setting R's for the PGA.
Computing Zin -
http://users.ece.gatech.edu/mleach/ece3050/notes/OpAmps/opampbw.pdf