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AD7541A: FAQs

I would like to calculate the total temp. Coefficient of this component.
If i use the RFB as the feedback resistor of the external Amp. and connect an
external Ref. what is the total temp. Coefficient with respect to the following
1. Gain Temp. Coeff.:  5ppm/C
2. Input Res. Temp. Coeff.:  -300ppm/C


Provided that the Vref is a low impedance source, the effect of the absolute
change in i/p resistance will not affect the gain tempco of the device.
Therefore you should use a low impedance ref source and use the gain of 5ppm/degC as your reference.