Instrumentation Amplifiers

Instrumentation amplifiers are a type of precision gain block, a differential amplifier (a type of electronic amplifier that amplifies the voltage difference between two inputs but suppresses any voltage common to the two inputs). Instrumentation Amplifiers are also known as in-amps.

Common applications are:

• Test & Measurement Industrial Devices
• Data Acquisition Devices
• Medical Devices
• Any noisy environment where large common-mode signals are present

How do instrumentation amplifiers work?

An instrumentation amplifier measures small signals in a noisy environment. The noise generally is "common-mode noise" (the difference between the noise-free common mode voltage and the actual common mode voltage). An instrumentation amplifier uses its common-mode rejection to distinguish the noise from the signal of interest.

What are the instrumentation amplifiers used for?

Instrumentation amplifiers are needed in nearly every field of electronics, particularly in the test and measurement industry. They can be used as a voltage follower, selective inversion circuit, a current-to-voltage converter, active rectifier, integrator, a variety of filters, and a voltage comparator.

Unlike instrumentation amplifiers (In Amp), operational amplifiers (Op Amp) are high-gain voltage amplifying devices with a differential input.

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Description Price Power Supply Type Package Type Mounting Type Typical Single Supply Voltage Pin Count Typical Dual Supply Voltage Rail to Rail Maximum Input Offset Voltage Minimum Operating Temperature Maximum Operating Temperature Maximum Input Resistance Minimum CMRR Typical Gain Bandwidth Product Maximum Supply Current
RS Stock No. 506-0293
Mfr. Part No.LT1167ACS8#PBF
PHP579.18
Each
units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.04mV 0 °C +70 °C 1000GΩ 90dB 1MHz 1.3 mA
RS Stock No. 522-9313
Mfr. Part No.AD624ADZ
PHP2,306.65
Each
units
Dual CDIP Through Hole - 16 ±15V No 0.2mV -25 °C +85 °C 1GΩ 75dB 25MHz -
RS Stock No. 378-2812
Mfr. Part No.INA155UA
PHP149.61
Each
units
Single SOIC Surface Mount 3 V, 5 V 8 - Rail to Rail Output 1mV -65 °C +150 °C 10000GΩ 80dB - -
RS Stock No. 912-9790
Mfr. Part No.AD521KDZ
PHP3,408.352
Each (In a Tube of 25)
units
Dual SBDIP Through Hole - 14 ±5 → ±18V - 1.5mV 0 °C +70 °C 0.01GΩ 74dB 40MHz 5 mA
RS Stock No. 783-3882
Mfr. Part No.MAX31855NASA+
PHP311.64
Each
units
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1300 °C - - - 1500 μA
RS Stock No. 783-3894
Mfr. Part No.MAX31855SASA+
PHP336.53
Each
units
Single SOIC Surface Mount 3.3 V 8 - No - +50 °C +1600 °C - - - 1500 μA
RS Stock No. 461-6520
Mfr. Part No.INA118UB
PHP912.21
Each
units
Dual SOIC Surface Mount - 8 ±15V No 50µV -40 °C +125 °C 10GΩ 80dB 800kHz 0.385 mA
RS Stock No. 111-1114
Mfr. Part No.AD624ADZ
PHP1,981.057
Each (In a Tube of 23)
units
Dual CDIP Through Hole - 16 ±15V - 0.2mV -25 °C +85 °C 1GΩ 75dB 25MHz -
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