8

®

INA157

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

A1, A2

FEATURE

BURR-BROWN IAs

OPA227

Low Noise

INA103

OPA129

Ultra Low Bias Current (fA)

INA116

OPA277

Low Offset Drift, Low Noise

INA114, INA128

OPA2134

FET Input (pA)

INA111, INA121

FIGURE 6. Boosting Output Current.

FIGURE 5. Precision Instrumentation Amplifier.

FIGURE 4. Precision Summing Amplifier.

V

1

V

2

5

6

1

3

V

0 = 2V1 + V2

INA157

2

6k

Ω

6k

Ω

12k

Ω

12k

Ω

5

6

1

3

INA157

2

V

1

V

O

A

2

A

1

R

2

R

2

R

1

–In

V

2

+In

V

O = (1 + 2R2/R1) (V2 –V1)

5

6

1

INA157

BUF634

2

3

V

O

R

L

–In

+In

(Low I

Q mode)

BUF634 inside feedback

loop contributes no error.

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

IOUT

• 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