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PGA309 With Output Scaling
(0 to 10V)
In many applications an external gain stage is used to get an output swing beyond the range of the
PGA309. The circuit shown below is a typical example of gain scaling with an offset shift. The PGA309
calibration spreadsheet can accommodate external gain and offset scaling. Doing the calibration by
measuring the output of the external gain stage will calibrate out errors caused by resistor tolerance in the
external stage.
SBOA103C
Jan 2006
R1
Vref
R2
Vout
PGA309
PGA309 Quick Start
System Reference Guide
Rf
-
Vin
+
R f
R f
+
+
⋅
V o
1
R 1
R 2
Vo
⋅
+
V o
(
ExtraGain
) V in
R f
−
⋅
V in
V ref
R 1
⋅
(
ExtraOffset
) V ref
86
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