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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
Spec's:
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
temp.co-eff of 5ppm/degC as your reference.

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