1B21
 
 
Rev. C | Page 6 of 8
TC Considerations of External Resistors
The specifications for gain and offset temperature coefficient
(TC) for the IB21 excluded the effects of external components.
The total gain TC for the circuit in Figure 4 is
Gain TC = 1B21 Gain TC + (Tracking TC of R
F
 and R
I
)
The offset TC is also affected by the thermal stability of the
internal voltage reference and its contribution is
Ref TC = (VREF)(RF/RO)(4 mA/V)(TC of VREF +
Tracking TC of RF and RO)/1 ?10
6
Total Offset TC = 1B21 Offset TC + Ref TC
Specifically using RF, RI and RO from Case 3 in Table 2, with
absolute TCs of ?5 ppm/癈
Gain TC = 50 + (25 + 25) = 100 ppm/癈
Offset TC = 300 + (6.225 V)(20k/124.3 k)(4 mA/V)
(20 + 25 + 25)/1 ?10
6
 = ?80 nA/癈
Similarly, when using a resistor network with a tracking spec
of ? ppm/癈, the total gain TC is ?5 ppm/癈 and the total
offset TC is ?00 nA/癈.
 
 
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