Q
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
A
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.