Datasheet

INA138, INA168
7
SBOS122C
www.ti.com
FIGURE 2. Buffering Output to Drive an A/D Converter.
I
S
OPA340
INA138
3
4
Z
IN
R
L
Buffer of amp drives A/D converter
without affecting gain.
FIGURE 3. Output Filter.
INA138
f
–3dB
=
1
2πR
L
C
L
V
O
f
–3dB
R
L
C
L
3
4
FIGURE 4. Offsetting the Output Voltage.
V
O
R
2
R
1
1
Gain Set by R
1
 R
2
Output Offset =
(V
R
)R
2
R
1
+ R
2
a) Using resistor divider.
V
O
R
L
1
REF200
100µA
V+
V
R
Gain Set by R
L
Output Offset = (100µA)(R
L
)
(independent of V+)
b) Using current source.
INA138
3
4
INA138
3
4
FIGURE 5. Bipolar Current Measurement.
Charger
Load
1
2
+5V
55
4
3
1
2
+5V
4
3
1Ω
10kΩ
10kΩ
INA168INA168
+
48V
5kΩ 5kΩ
IN4148
±1A
IN4148
100kΩ
SIGN
0V to 1V
Comparator
V
O