INA157
2
6kΩ
12kΩ
INA157
BUF634 inside feedback
loop contributes no error.
5
5
–In
2
V
1
1
6kΩ
6
6
V
0
= 2V
1
+ V
2
BUF634
V
O
R
L
12kΩ
V
2
3
+In
3
1
(Low I
Q
mode)
FIGURE 4. Precision Summing Amplifier.
FIGURE 6. Boosting Output Current.
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:
5
V
1
INA157
–In
A
1
2
R
2
• Current Receiver with Compliance to Rails
•
±10V
Precision Voltage Reference
•
±5V
Precision Voltage Reference
V
O
R
1
R
2
3
V
2
+In
A
2
V
O
= (1 + 2R
2
/R
1
) (V
2
–V
1
)
6
1
• 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
• Digitally Controlled Gain of
±1
Amplifier
The INA157 can be combined with op amps to form a complete instru-
mentation amplifier with specialized performance characteristics. Burr-
Brown offers many complete high performance IAs. Products with related
performances are shown at the right.
SIMILIAR COMPLETE
BURR-BROWN IAs
INA103
INA116
INA114, INA128
INA111, INA121
A
1
, A
2
OPA227
OPA129
OPA277
OPA2134
FEATURE
Low Noise
Ultra Low Bias Current (fA)
Low Offset Drift, Low Noise
FET Input (pA)
FIGURE 5. Precision Instrumentation Amplifier.
®
INA157
8
ETC [ ETC ]
