With Trim
Input Range
Without Trim
(Adjust offset first at 0V, then adjust gain)
200Ω
200Ω
R1IN
R1IN
AGND1
AGND1
R2IN
100Ω
100Ω
R2IN
VIN
VIN
33.2kΩ
0V – 10V
R3IN
R3IN
33.2kΩ
+5V
2.2µF
+
CAP
REF
+5V
CAP
REF
50kΩ
+
576kΩ
2.2µF
50kΩ
+
+
2.2µF
2.2µF
AGND2
AGND2
200Ω
200Ω
R1IN
R1IN
AGND1
R2IN
AGND1
R2IN
100Ω
100Ω
33.2kΩ
33.2kΩ
R3IN
VIN
R3IN
0V – 5V
VIN
+5V
CAP
REF
CAP
REF
+5V
50kΩ
+
576kΩ
2.2µF
+
50kΩ
2.2µF
+
+
2.2µF
2.2µF
AGND2
AGND2
200Ω
VIN
R1IN
200Ω
100Ω
VIN
R1IN
AGND1
R2IN
AGND1
R2IN
100Ω
R3IN
0V – 4V
R3IN
33.2kΩ
+5V
+5V
33.2kΩ
CAP
REF
+
+
CAP
REF
2.2µF
576kΩ
+
2.2µF
50kΩ
50kΩ
2.2µF
+
2.2µF
AGND2
AGND2
FIGURE 4a. Offset/Gain Circuits for Unipolar Input Ranges.
®
9
ADS7809
BB [ BURR-BROWN CORPORATION ]
