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. 523-7572
Mfr. Part No.AD620BRZ
£9.73
Each
Units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.05mV -40 °C +85 °C 10GΩ 80dB 120kHz -
RS Stock No. 111-1105
Mfr. Part No.AD625JNZ
£13.762
Each (In a Tube of 25)
Units
Dual PDIP Through Hole - 16 ±12 V, ±15 V, ±9 V - 0.05mV 0 °C +70 °C 1GΩ 70dB 25MHz -
RS Stock No. 522-9098
Mfr. Part No.AD625JNZ
£16.00
Each
Units
Dual PDIP Through Hole - 16 ±12 V, ±15 V, ±9 V No 0.05mV 0 °C +70 °C 1GΩ 70dB 25MHz -
RS Stock No. 111-1154
Mfr. Part No.AD8221ARMZ
£3.293
Each (In a Tube of 50)
Units
Dual, Single LFCSP Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 2.7mV -40 °C +125 °C 0.8MΩ 62dB - -
RS Stock No. 759-0027
Mfr. Part No.AD8226ARZ
£2.60
Each
Units
Dual, Single SOIC Surface Mount 2.2 → 36 V 8 ±1.35 → ±18V Rail to Rail Output 100µV -40 °C +125 °C 100kΩ 80dB 1.5MHz 350 μA
RS Stock No. 400-970
Mfr. Part No.AD8231ACPZ-WP
£2.05
Each
Units
Dual, Single LFCSP Surface Mount 5 V 16 - Rail to Rail Output 0.015mV -40 °C +125 °C 10GΩ 80dB 7MHz -
RS Stock No. 914-0469
Mfr. Part No.AD8226ARZ-R7
£1.279
Each (On a Reel of 1000)
Units
Dual, Single SOIC Surface Mount 2.2 → 36 V 8 ±1.35 → ±18V Rail to Rail Output 100µV -40 °C +125 °C - 80 dB @ 5 kHz, 86 dB @ 60 kHz 1.5MHz 600 μA
RS Stock No. 912-7069
Mfr. Part No.AD597ARZ
£4.371
Each (In a Tube of 98)
Units
Single SOIC Surface Mount 5 → 30 V 8 - No - -55 °C +125 °C - - 15kHz -
RS Stock No. 783-3891
Mfr. Part No.MAX31855RASA+
BrandMaxim
£4.25
Each
Units
Single SOIC Surface Mount 3.3 V 8 - No - -50 °C +1770 °C - - - 1500 μA
RS Stock No. 165-9393
Mfr. Part No.MAX31855RASA+
BrandMaxim
£3.861
Each (In a Tube of 10)
Units
Single SOIC Surface Mount 3.3 V 8 - No - -50 °C +1770 °C - - - 1500 μA
RS Stock No. 759-0875
Mfr. Part No.AD623BNZ
£6.48
Each
Units
Dual, Single PDIP Through Hole 2.7 → 12 V 8 ±2.5 → ±6V Rail to Rail Output 0.1mV -40 °C +85 °C 2GΩ - 800kHz 0.55 mA
RS Stock No. 806-7985
Mfr. Part No.AD8422ARZ
£4.84
Each
Units
Dual, Single SOIC Surface Mount 3.6 → 36 V 8 ±1.8 → ±18V Rail to Rail Output 60µV -40 °C +85 °C 10kΩ 80dB 2.2MHz 1 nA
RS Stock No. 912-8154
Mfr. Part No.AD8422ARZ
£3.518
Each (In a Tube of 98)
Units
Dual, Single SOIC Surface Mount 3.6 → 36 V 8 ±1.8 → ±18V Rail to Rail Output 60µV -40 °C +85 °C 10kΩ 80dB 2.2MHz 1 nA
RS Stock No. 778-5105
Mfr. Part No.AD8237ARMZ
£2.495
Each (In a Pack of 2)
Units
Single MSOP Surface Mount 1.8 to 5.5 V 8 - Rail to Rail Input/Output 75µV -40 °C +125 °C - 106dB 6MHz 115 μA
RS Stock No. 755-9546
Mfr. Part No.MCP6N11-001E/SN
BrandMicrochip
£1.065
Each (In a Pack of 2)
Units
Single SOIC Surface Mount 1.8 → 5.5 V 8 - Rail to Rail Input/Output 0.35V -40 °C +125 °C - 70dB 500kHz 0.8 mA
RS Stock No. 761-8497
Mfr. Part No.LT1920IS8#PBF
£6.11
Each
Units
Dual SOIC Surface Mount - 8 ±20V Rail to Rail Output 0.185mV -40 °C +85 °C 200GΩ 75dB 1MHz 1.3 mA
RS Stock No. 100-0774
Mfr. Part No.INA125UA
£4.138
Each (In a Tube of 40)
Units
Dual, Single SOIC Surface Mount 5 V 16 ±15V - 0.5mV -55 °C +125 °C 100GΩ 72dB - -
RS Stock No. 461-6536
Mfr. Part No.INA128UA
£6.68
Each
Units
Dual SOIC Surface Mount - 8 ±15V No 125µV -40 °C +85 °C 100GΩ 73dB 1.3MHz -
RS Stock No. 252-1600
Mfr. Part No.INA125UA
£5.09
Each
Units
Dual, Single SOIC Surface Mount 5 V 16 ±15V No 0.5mV -55 °C +125 °C 100GΩ 72dB - -
RS Stock No. 100-3847
Mfr. Part No.INA128UA
£5.425
Each (In a Tube of 75)
Units
Dual SOIC Surface Mount - 8 ±15V - 125µV -40 °C +85 °C 100GΩ 73dB 1.3MHz -
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