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. 169-8737
Mfr. Part No.AD595CQ
£18.91
Each
Units
Dual, Single CDIP Through Hole 5 V 14 ±15V No - -55 °C +125 °C - - 15kHz -
RS Stock No. 923-2360
Mfr. Part No.INA114AP
£7.296
Each (In a Tube of 50)
Units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V - 125µV -40 °C +85 °C 10GΩ 110dB 1MHz 3 mA
RS Stock No. 311-524
Mfr. Part No.INA114AP
£9.19
Each
Units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 125µV -40 °C +85 °C 10GΩ 110dB 1MHz 3 mA
RS Stock No. 912-9999
Mfr. Part No.AD8421BRMZ
£5.958
Each (In a Tube of 50)
Units
Dual, Single MSOP Surface Mount 5 → 36 V 8 ±2.5 → ±18V Rail to Rail Input 25µV -40 °C +125 °C 4kΩ 100dB 10MHz 2.6 mA
RS Stock No. 796-8874
Mfr. Part No.AD8421BRMZ
£7.77
Each
Units
Dual, Single MSOP Surface Mount 5 → 36 V 8 ±2.5 → ±18V Rail to Rail Input 25µV -40 °C +125 °C 4kΩ 100dB 10MHz 2.6 mA
RS Stock No. 177-7115
Mfr. Part No.EL8170FSZ
BrandIntersil
£1.112
Each (In a Tube of 97)
Units
Single SOIC Surface Mount 3 V, 5 V 8 - Rail to Rail Input/Output 0.2mV -40 °C +125 °C - 90dB - 0.095 mA
RS Stock No. 518-069
Mfr. Part No.EL8170FSZ
BrandIntersil
£1.132
Each (In a Pack of 5)
Units
Single SOIC Surface Mount 3 V, 5 V 8 - Rail to Rail Input/Output 0.2mV -40 °C +125 °C - 90dB - 0.095 mA
RS Stock No. 523-6248
Mfr. Part No.AD623ARMZ
£4.05
Each
Units
Dual, Single MSOP Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.5mV -40 °C +85 °C 2GΩ 70dB - -
RS Stock No. 111-1152
Mfr. Part No.AD623ARMZ
£2.47
Each (In a Tube of 50)
Units
Dual, Single MSOP Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.5mV -40 °C +85 °C 2GΩ 70dB - -
RS Stock No. 545-5770
Mfr. Part No.LTK001CN8#PBF
£10.34
Each
Units
- PDIP Through Hole - 8 - - - 0 °C +70 °C - - - -
RS Stock No. 153-3424
Mfr. Part No.LTK001CN8#PBF
£6.703
Each (In a Tube of 50)
Units
- PDIP Through Hole - 8 - - - 0 °C +70 °C - - - -
RS Stock No. 661-2413
Mfr. Part No.INA326EA/250
£4.07
Each
Units
Single MSOP Surface Mount 3 V, 5 V 8 - Rail to Rail Input/Output 0.1mV -40 °C +85 °C 10GΩ 100dB - -
RS Stock No. 182-8534
Mfr. Part No.INA118P
£9.28
Each
Units
Dual PDIP Through Hole - 8 ±15V No 125µV -40 °C +125 °C 10GΩ 73dB 800kHz 0.385 mA
RS Stock No. 100-0755
Mfr. Part No.INA118P
£7.692
Each (In a Tube of 50)
Units
Dual PDIP Through Hole - 8 ±15V - 125µV -40 °C +125 °C 10GΩ 73dB 800kHz 0.385 mA
RS Stock No. 923-5570
Mfr. Part No.MAX6675ISA+
BrandMaxim
£7.154
Each (In a Tube of 100)
Units
Single SOIC Surface Mount 3 → 5.5 V 8 - No - -20 °C +85 °C - - - 1.5 mA
RS Stock No. 121-6905
Mfr. Part No.AD8429BRZ
£7.722
Each (In a Tube of 98)
Units
Dual SOIC Surface Mount - 8 ±4 → ±18V - 50µV -40 °C +125 °C 10kΩ 140dB 15MHz 9 mA
RS Stock No. 806-7991
Mfr. Part No.AD8429BRZ
£10.10
Each
Units
Dual SOIC Surface Mount - 8 ±4 → ±18V - 50µV -40 °C +125 °C 10kΩ 140dB 15MHz 9 mA
RS Stock No. 698-7118
Mfr. Part No.MAX6675ISA+
BrandMaxim
£9.16
Each
Units
Single SOIC Surface Mount 3 → 5.5 V 8 - No - -20 °C +85 °C - - - 1.5 mA
RS Stock No. 759-0099
Mfr. Part No.AD8495CRMZ
£7.44
Each
Units
Dual, Single MSOP Surface Mount 2.7 → 36 V 8 ±2.7 → ±18V Rail to Rail Output - -40 °C +125 °C - - 25kHz 0.25 mA
RS Stock No. 660-6512
Mfr. Part No.INA121UA
£4.90
Each
Units
Dual SOIC Surface Mount - 8 ±15V No - -40 °C +85 °C 1000GΩ 72dB - 0.525 mA
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