Datasheet

9
®
INA137, INA2137
FIGURE 4. Precision Summing Amplifier.
FIGURE 5. Boosting Output Current.
FIGURE 6. High Input Impedance Instrumentation Amplifier.
The difference amplifier is a highly versatile building
block that is useful in a wide variety of applications. See
the INA105 data sheet for additional applications ideas,
including:
• Current Receiver with Compliance to Rails
• ±10V Precision Voltage Reference
• ±5V Precision Voltage Reference
• Precision Average Value Amplifier
• Precision Bipolar Offsetting
• Precision Summing Amplifier with Gain
• Instrumentation Amplifier Guard Drive Generator
• Precision Summing Instrumentation Amplifier
• Precision Absolute Value Buffer
• Precision Voltage-to-Current Converter with Differential
Inputs
• Differential Input Voltage-to-Current Converter for Low
I
OUT
• Isolating Current Source
• Differential Output Difference Amplifier
• Isolating Current Source with Buffering Amplifier for
Greater Accuracy
• Window Comparator with Window Span and Window
Center Inputs
• Precision Voltage-Controlled Current Source with Buff-
ered Differential Inputs and Gain
BUF634
+In
–In
5
6
1
63
3
V
O
INA137
12kΩ 6kΩ
12kΩ 6kΩ
2
5
6
3
INA137
2
1
V
0
0utput
V
1
1/2
OPA2134
1/2
OPA2134
R
2
6kΩ
G = 2
12kΩ
6kΩ 12kΩ
R
2
R
1
–In
V
2
+In
V
O
= 2 (1 + 2R
2
/R
1
) (V
2
–V
1
)
V
1
V
2
5
6
1
3
V
0
= 2V
1
+ V
2
INA137
2
6kΩ
6kΩ
12kΩ
12kΩ