Differential Amplifiers

What is a Differential Amplifier?
A differential amplifier is a type of electronic amplifier that increases the difference between 2 input voltages. Differential amplifiers also suppress and voltage common to the two inputs. A digital amplifier is one on the most used and important components within integrated circuits.

Differential Amplifier 2 inputs
• One inverting
• One non-inverting

Why use a Differential Amplifier?
Differential amplifiers are used to amplify balanced differential signals which are used to communicate small signals in electrically noisy environments. The signal wires should be close or wired together and most of the induced noise with be “common mode”, affecting both wires in the same way.

Differential Amplifier Applications.
The main application of a differential amplifier is to get rid of any noise and voltages that are present in both of the voltage inputs. This noise is present in common mode fluctuating voltage. Differential amplifiers are used in circuits that utilise negative feedback, controlling motors and signal amplification.

Various electronic devices use differential amplifiers.
• FM/Am Radio signal recovery
• Audio pre-amplifiers
• Microphone pre-amplifiers
• TV Signal recovery
• Digital to analogue converters

A Differential amplifier can be configured to operate as single ended amplifier by grounding one of the inputs.
Modern differential amplifiers normally sit on a single microchip. Inside the microchip, positive and negative signals are added and become a single output.

What is CMRR and PSRR?
CMRR – Common mode rejection ratio
PSSR – Power supply rejection ratio

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Description Price Power Supply Type Typical Single Supply Voltage Typical Dual Supply Voltage Maximum Input Offset Voltage Maximum Input Resistance Maximum Voltage Gain Typical Gain Bandwidth Product Minimum CMRR Output Configuration Number of Channels per Chip Mounting Type Package Type Pin Count Rail to Rail
RS Stock No. 778-5118
Mfr. Part No.AD8476BRMZ
£4.85
Each
Units
Dual 3 to 18 V ±1.5 to ±9V - 500kΩ 1V/V 6MHz 90dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 912-9945
Mfr. Part No.AD8476BRMZ
£3.582
Each (In a Tube of 50)
Units
Dual 3 → 18 V ±1.5 → ±9V - 500kΩ 1V/V 6MHz 90dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 697-6988
Mfr. Part No.AD698APZ
£25.33
Each
Units
- 17.5 V 13V - - - - - - - Surface Mount PLCC 28 -
RS Stock No. 912-6145
Mfr. Part No.AD698APZ
£24.092
Each (In a Tube of 39)
Units
- 17.5 V 13V - - - - - - - Surface Mount PLCC 28 -
RS Stock No. 647-659
Mfr. Part No.INA105KP
£7.30
Each
Units
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
RS Stock No. 100-0744
Mfr. Part No.INA105KP
£5.93
Each (In a Tube of 50)
Units
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
RS Stock No. 709-6061
Mfr. Part No.AD629ANZ
£6.60
Each
Units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 1mV 0.8MΩ 0dB - 77dB - 1 Through Hole PDIP 8 -
RS Stock No. 177-7172
Mfr. Part No.LT6350CMS8#PBF
£3.956
Each (In a Tube of 50)
Units
Single 2.7 → 12 V - 1.5mV 4MΩ - 115MHz 96dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
RS Stock No. 912-7763
Mfr. Part No.AD629ANZ
£5.22
Each (In a Tube of 50)
Units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 1mV 0.8MΩ 0dB - 77dB - 1 Through Hole PDIP 8 -
RS Stock No. 851-6821
Mfr. Part No.LT6350CMS8#PBF
£4.395
Each (In a Pack of 2)
Units
Single 2.7 → 12 V - 1.5mV 4MΩ - 115MHz 96dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
RS Stock No. 497-0032
Mfr. Part No.AD628ARZ
£4.96
Each
Units
Dual, Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 3mV 0.22MΩ 40dB - 75dB - 2 Surface Mount SOIC 8 -
RS Stock No. 912-8845
Mfr. Part No.AD628ARZ
£3.00
Each (In a Tube of 98)
Units
Dual, Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 3mV 0.22MΩ 40dB - 75dB - 2 Surface Mount SOIC 8 -
RS Stock No. 912-7378
Mfr. Part No.AD626ANZ
£6.42
Each (In a Tube of 50)
Units
Dual, Single 5 V ±5V 2.5mV 0.02MΩ - - 55dB - 1 Through Hole PDIP 8 -
RS Stock No. 522-8685
Mfr. Part No.AD626ANZ
£8.10
Each
Units
Dual, Single 5 V ±5V 2.5mV 0.02MΩ - - 55dB - 1 Through Hole PDIP 8 -
RS Stock No. 497-3700
Mfr. Part No.AD8132ARZ
£4.35
Each
Units
Dual, Single 3 V, 5 V, 9 V ±3 V, ±5 V 3.5mV 3MΩ 0.129dB - - - 1 Surface Mount SOIC 8 -
RS Stock No. 912-8970
Mfr. Part No.AD8132ARZ
£2.44
Each (In a Tube of 98)
Units
Dual, Single 3 V, 5 V, 9 V ±3 V, ±5 V 3.5mV 3MΩ 0.129dB - - - 1 Surface Mount SOIC 8 -
RS Stock No. 106-6377
Mfr. Part No.AD629ARZ
£4.43
Each (In a Tube of 98)
Units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 1mV 0.8MΩ 0dB - 77dB - 1 Surface Mount SOIC 8 -
RS Stock No. 230-551
Mfr. Part No.AD629ARZ
£5.46
Each
Units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 1mV 0.8MΩ 0dB - 77dB - 1 Surface Mount SOIC 8 -
RS Stock No. 378-2733
Mfr. Part No.INA133UA
£2.51
Each
Units
Dual, Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±15V 1.5mV 0.05MΩ 0dB - 74dB - 1 Surface Mount SOIC 8 -
RS Stock No. 912-7362
Mfr. Part No.AMP03GPZ
£4.56
Each (In a Tube of 50)
Units
Dual - ±6 → ± 18V 0.75mV - - - 80dB - 1 Through Hole PDIP 8 -
Related Products
Differential Amplifiers by Analog Devices are integrated and ...
Description:
Differential Amplifiers by Analog Devices are integrated and optimised for differential signalling applications. These speciality amplifiers have inherent common mode rejection properties that provide a low harmonic distortion with an output gain and phase matching. Applications include driving or receiving signals over long cable lengths, driving a balanced ADC input ...
Differential Amplifiers by Analog Devices are integrated and ...
Description:
Differential Amplifiers by Analog Devices are integrated and optimised for differential signalling applications. These speciality amplifiers have inherent common mode rejection properties that provide a low harmonic distortion with an output gain and phase matching. Applications include driving or receiving signals over long cable lengths, driving a balanced ADC input ...
Differential Amplifiers by Analog Devices are integrated and ...
Description:
Differential Amplifiers by Analog Devices are integrated and optimised for differential signalling applications. These speciality amplifiers have inherent common mode rejection properties that provide a low harmonic distortion with an output gain and phase matching. Applications include driving or receiving signals over long cable lengths, driving a balanced ADC input ...
Differential Amplifiers by Analog Devices are integrated and ...
Description:
Differential Amplifiers by Analog Devices are integrated and optimised for differential signalling applications. These speciality amplifiers have inherent common mode rejection properties that provide a low harmonic distortion with an output gain and phase matching. Applications include driving or receiving signals over long cable lengths, driving a balanced ADC input ...