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. 923-3448
Mfr. Part No.PGA207UA
£23.158
Each (In a Tube of 40)
Units
Dual SOIC Surface Mount - 16 ±15V - 2.5mV -40 °C +85 °C - 75dB - 12 mA
RS Stock No. 183-2329
Mfr. Part No.AMP04FPZ
£10.741
Each (In a Tube of 50)
Units
Single PDIP Through Hole ±15 V 8 - Rail to Rail Output 600µV -40 °C +85 °C 4GΩ 55dB 70kHz 850 μA
RS Stock No. 162-5218
Mfr. Part No.PGA206PA
£20.952
Each (In a Tube of 25)
Units
Dual PDIP Through Hole - 16 ±15V No 2.5mV -40 °C +85 °C - 75dB - 12 mA
New
RS Stock No. 189-8832
Mfr. Part No.MAX4208AUA+
BrandMaxim
£1.93
Each (In a Pack of 5)
Units
Dual, Single μMAX Surface Mount 2.85 → 5.5 V 8 ±1.425 to ±2.75V Rail to Rail Output 0.02mV -40 °C +125 °C 2GΩ 106dB 750kHz 3 mA
New
RS Stock No. 192-3101
Mfr. Part No.MAX31855NASA+
BrandMaxim
£3.713
Each (In a Tube of 100)
Units
Single SOIC Surface Mount 3.3 V 8 - - - -200 °C +1300 °C - - - 1500 μA
RS Stock No. 709-6064
Mfr. Part No.AD625KNZ
£28.18
Each
Units
Dual PDIP Through Hole - 16 ±12 V, ±15 V, ±9 V No 0.025mV 0 °C +70 °C 1GΩ 75dB 25MHz -
RS Stock No. 121-9034
Mfr. Part No.INA337AIDGKT
£2.901
Each (On a Reel of 250)
Units
Single MSOP Surface Mount 3 V, 5 V 8 - - 0.1mV -40 °C +125 °C 10GΩ 106dB - -
RS Stock No. 912-6233
Mfr. Part No.AD8223BRZ
£1.569
Each (In a Tube of 98)
Units
Dual, Single SOIC Surface Mount 3 → 24 V 8 ±2 → ±12V Rail to Rail Output 0.1mV -40 °C +85 °C 2GΩ 86dB - -
RS Stock No. 709-5765
Mfr. Part No.AD524BDZ
£43.18
Each
Units
Dual SBCDIP Through Hole - 16 ±15V No 0.1mV -40 °C +85 °C 1GΩ 75dB 25MHz -
RS Stock No. 183-1716
Mfr. Part No.AD620ARZ-REEL7
£4.596
Each (On a Reel of 750)
Units
Dual SOIC Surface Mount - 8 ±2.3 to ±18V - 125µV -40 °C +85 °C - 110dB 1MHz 1.3 mA
New
RS Stock No. 189-7744
Mfr. Part No.MAX31855JASA+
BrandMaxim
£3.20
Each (In a Tube of 100)
Units
Single SOIC Surface Mount 3.3 V 8 - No - -40 °C +750 °C - - - 1500 μA
RS Stock No. 697-7246
Mfr. Part No.AD8223BRZ
£1.64
Each
Units
Dual, Single SOIC Surface Mount 3 → 24 V 8 ±2 → ±12V Rail to Rail Output 0.1mV -40 °C +85 °C 2GΩ 86dB - -
RS Stock No. 102-5658
Mfr. Part No.INA331IDGKT
£1.145
Each (On a Reel of 250)
Units
Single MSOP Surface Mount 3 V, 5 V 8 - Rail to Rail Output 0.5mV -55 °C +125 °C 10000GΩ 90dB - -
RS Stock No. 162-7734
Mfr. Part No.LMP8358MA/NOPB
£4.307
Each (In a Tube of 55)
Units
Dual, Single SOIC Surface Mount 2.7 → 5.5 V 14 ±1.35 → ±2.75V Rail to Rail Output 15µV -40 °C +125 °C - 105dB 930kHz 2.2 mA
New
RS Stock No. 189-8812
Mfr. Part No.MAX4194ESA+
BrandMaxim
£2.228
Each (In a Pack of 5)
Units
Dual, Single SOIC Surface Mount 2.7 → 7.5 V 8 ±1.35 to ±3.75V Rail to Rail Output 0.69mV -40 °C +85 °C 1GΩ 60dB 250kHz 0.00002 mA
RS Stock No. 661-2457
Mfr. Part No.INA115BU
£11.21
Each
Units
Dual SOIC Surface Mount - 16 ±15V No - -40 °C +85 °C 10GΩ 80dB - 3 mA
New
RS Stock No. 192-3172
Mfr. Part No.MAX31855RASA+
BrandMaxim
£5.41
Each (In a Pack of 2)
Units
Single SOIC Surface Mount 3.3 V 8 - - - -50 °C +1770 °C - - - 1500 μA
RS Stock No. 183-2328
Mfr. Part No.AMP01FX
£20.159
Each (In a Tube of 21)
Units
Dual CERDIP Through Hole - 18 ±18 (Maximum)V - 150µV -25 °C +85 °C 20GΩ 75dB 26MHz 280 μA
RS Stock No. 660-4267
Mfr. Part No.INA331IDGKT
£1.18
Each
Units
Single MSOP Surface Mount 3 V, 5 V 8 - Rail to Rail Output 0.5mV -55 °C +125 °C 10000GΩ 90dB - -
RS Stock No. 170-8131
Mfr. Part No.ISL28635FVZ-T7A
BrandIntersil
£1.976
Each (On a Reel of 250)
Units
Dual, Single TSSOP Surface Mount 2.5 → 5.5 V 14 ±1.25 → ±2.75V Rail to Rail Input/Output 10µV -40 °C +125 °C - 80dB 3MHz 3.6 mA
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The Instrumentation Amplifier ICs amplify the difference between two input signal voltages, while rejecting any signals that are common to both inputs. The DC precision and gain accuracy is maintained within a noisy environment, and also where large common-mode signals (AC power line frequency) are present.
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The Instrumentation Amplifier ICs amplify the difference between two input signal voltages, while rejecting any signals that are common to both inputs. The DC precision and gain accuracy is maintained within a noisy environment, and also where large common-mode signals (AC power line frequency) are present.