Issue with PGA when external reference is used in PSoC3/5 | Cypress Semiconductor
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Issue with PGA when external reference is used in PSoC3/5
In PGA configuration, when reference is selected as external and reference input is connected to internal available references i.e. 1.024V or 0.256V, output is not what is expected? How to fix it?
In non inverting amplifier, reference in connected to input resistance. Reference generator should supply required current for the proper operation. You might have connected 1.024V reference to the reference input and could not make PGA work. The reason is, our references are not capable of driving current more than few 10’s of nA.
There are several ways to handle it: