Input Range
Without Trim
With Trim
(Adjust offset first at 0V, then adjust gain)
200Ω
V
IN
R1
IN
V
IN
200Ω
R1
IN
AGND1
100Ω
R2
IN
100Ω
AGND1
R2
IN
+5V
50kΩ
33.2kΩ
±
10V
33.2kΩ
R3
IN
R3
IN
+
2.2µF
CAP
+5V
2.2µF
576kΩ
50kΩ
2.2µF
+
CAP
REF
2.2µF
+
AGND2
REF
+
AGND2
200Ω
R1
IN
200Ω
R1
IN
AGND1
100Ω
33.2kΩ
V
IN
R2
IN
V
IN
33.2kΩ
100Ω
AGND1
R2
IN
R3
IN
+
+5V
2.2µF
+5V
50kΩ
576kΩ
50kΩ
2.2µF
+
R3
IN
±
5V
CAP
+
2.2µF
REF
2.2µF
+
AGND2
CAP
REF
AGND2
200Ω
V
IN
100Ω
R1
IN
V
IN
200Ω
R1
IN
AGND1
100Ω
AGND1
R2
IN
R2
IN
33.2kΩ
R3
IN
+5V
33.2kΩ
2.2µF
+5V
50kΩ
R3
IN
+
CAP
576kΩ
CAP
±
3.3V
+
2.2µF
+
2.2µF
AGND2
REF
50kΩ
+
2.2µF
REF
AGND2
FIGURE 4b. Offset/Gain Circuits for Bipolar Input Ranges.
ADS7809
SBAS017C
www.ti.com
11