I would like to interface to a PT1000 RTD device.
Ideally I would us a PGA gain of 1 but, I cannot use the input buffer with Gain=1 due to the chip limitation..
Any suggestions or recommendations?
We suggest using the PGA with a gain of 2.
We base our idea on the following:
PT1000 resistance range is ~670 ohms to 2840 ohms.
We suggest 6800ohms for the Reference resistor - usually connected in series with the PT1000 resistor.
We suggest using an Excitation current value of 150uA.
This will give a reference voltage to the ADC of 1.02V.
The input voltage range will be 100.5mV to 426mV.
There is enough margin here for PT1000 variations and excitation current accuracies and drift.
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