With Trim
Input Range
Without Trim
(Adjust offset first at 0V, then adjust gain)
200Ω
200Ω
VIN
VIN
R1IN
R1IN
AGND1
R2IN
AGND1
R2IN
100Ω
100Ω
+5V
±10V
33.2kΩ
R3IN
R3IN
33.2kΩ
50kΩ
+5V
CAP
REF
CAP
REF
+
+
+
2.2µF
2.2µF
576kΩ
50kΩ
+
2.2µF
2.2µF
AGND2
AGND2
200Ω
200Ω
R1IN
R1IN
AGND1
R2IN
AGND1
R2IN
100Ω
100Ω
VIN
33.2kΩ
VIN
33.2kΩ
R3IN
R3IN
±5V
+
2.2µF
+5V
CAP
REF
CAP
REF
+5V
+
50kΩ
576kΩ
2.2µF
50kΩ
+
+
2.2µF
2.2µF
AGND2
AGND2
200Ω
200Ω
VIN
R1IN
VIN
R1IN
AGND1
R2IN
100Ω
100Ω
AGND1
R2IN
R3IN
R3IN
33.2kΩ
2.2µF
33.2kΩ
±3.33V
+
2.2µF
+5V
CAP
REF
CAP
REF
+5V
50kΩ
576kΩ
+
50kΩ
+
+
2.2µF
2.2µF
AGND2
AGND2
FIGURE 4b. Offset/Gain Circuits for Bipolar Input Ranges.
10
ADS7808
SBAS018A
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