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. 427-008
Mfr. Part No.AD629BRZ
£8.08
Each
Units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 0.5mV 0.8MΩ 0dB - 86dB - 1 Surface Mount SOIC 8 -
RS Stock No. 155-6747
Mfr. Part No.LT6600CS8-5#PBF
£3.447
Each (In a Tube of 100)
Units
Dual, Single 5 V ±5V 35mV 7.7kΩ - - - - 1 Surface Mount SOIC 8 -
RS Stock No. 912-8703
Mfr. Part No.AD629BRZ
£6.90
Each (In a Tube of 98)
Units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 0.5mV 0.8MΩ 0dB - 86dB - 1 Surface Mount SOIC 8 -
RS Stock No. 759-0042
Mfr. Part No.AD8276ARMZ
£2.21
Each
Units
Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 145-6906
Mfr. Part No.THS4509RGTT
£4.832
Each (On a Reel of 250)
Units
Dual, Single 5 V ±2.5V 4mV 0.05MΩ 68dB 3GHz - - 1 Surface Mount QFN 16 -
RS Stock No. 912-6237
Mfr. Part No.AD8275ARMZ
£2.56
Each (In a Tube of 50)
Units
Dual, Single 5 V ±3 V, ±5 V - 0.108MΩ 13.98dB - 80dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 145-6242
Mfr. Part No.AD8274ARMZ
£1.17
Each (In a Tube of 50)
Units
Dual - ±2.5 → ±18V 1100µV 9kΩ - 10MHz 83dB - 1 Surface Mount MSOP 8 -
RS Stock No. 759-0083
Mfr. Part No.AD8475ARMZ
£4.04
Each
Units
Dual, Single 3 → 10 V ±1.5 → ±5V - .0029MΩ - 150MHz 76dB - - Surface Mount MSOP 10 Rail to Rail Output
RS Stock No. 145-1264
Mfr. Part No.AD8202YRZ
£2.23
Each (In a Tube of 98)
Units
Single 5 V, 9 V - 2mV - 40dB - 82dB - 1 Surface Mount SOIC 8 -
RS Stock No. 820-9454
Mfr. Part No.AD8274ARMZ
£1.19
Each (In a Pack of 5)
Units
Dual - ±2.5 → ±18V 1100µV 9kΩ - 10MHz 83dB - 1 Surface Mount MSOP 8 -
RS Stock No. 100-0776
Mfr. Part No.INA132UA
£2.188
Each (In a Tube of 75)
Units
Dual, Single 5 V ±15V 0.75mV 0.08MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
RS Stock No. 759-1297
Mfr. Part No.AD8276ARZ
£1.98
Each
Units
Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 462-0967
Mfr. Part No.THS4505DGN
£4.50
Each
Units
Dual, Single 5 V ±5V 7mV 0.025MΩ 54dB 200MHz 74dB - 1 Surface Mount MSOP 8 -
RS Stock No. 697-7252
Mfr. Part No.AD8275ARMZ
£3.21
Each
Units
Dual, Single 5 V ±3 V, ±5 V - 0.108MΩ 13.98dB - 80dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 145-7532
Mfr. Part No.INA133U
£2.63
Each (In a Tube of 75)
Units
Dual, Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±15V 0.75mV 0.05MΩ 0dB - 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 912-7387
Mfr. Part No.AD626ARZ
£5.726
Each (In a Tube of 98)
Units
Dual, Single 5 V ±5V 2.5mV 0.02MΩ - - 55dB - 1 Surface Mount SOIC 8 -
RS Stock No. 774-1408
Mfr. Part No.THS4531ID
£2.30
Each
Units
Single 2.5 → 5.5 V - ±2000µV 200kΩ 114dB 27MHz 90dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 779-9564
Mfr. Part No.LT1994IMS8#PBF
£3.52
Each (In a Pack of 2)
Units
Single 3 V - ±3mV 4.5kΩ 100dB 70MHz 55dB - 2 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 709-5068
Mfr. Part No.AD8202YRZ
£2.68
Each
Units
Single 5 V, 9 V - 2mV - 40dB - 82dB - 1 Surface Mount SOIC 8 -
RS Stock No. 252-1644
Mfr. Part No.INA132UA
£1.32
Each
Units
Dual, Single 5 V ±15V 0.75mV 0.08MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
Related Products
Differential Amplifiers are operational amplifiers configured to amplify ...
Description:
Differential Amplifiers are operational amplifiers configured to amplify differential input signals but to supress or reject common-mode signals; they incorporate on-chip resistors to define the differential gain. Differential Amplifiers, Texas Instruments. Instrumentation Amplifiers, Texas Instruments.
Differential Amplifiers are operational amplifiers configured to amplify ...
Description:
Differential Amplifiers are operational amplifiers configured to amplify differential input signals but to supress or reject common-mode signals; they incorporate on-chip resistors to define the differential gain. Differential Amplifiers, Texas Instruments. Instrumentation Amplifiers, Texas Instruments.
Differential Amplifiers are operational amplifiers configured to amplify ...
Description:
Differential Amplifiers are operational amplifiers configured to amplify differential input signals but to supress or reject common-mode signals; they incorporate on-chip resistors to define the differential gain. Differential Amplifiers, Texas Instruments. Instrumentation Amplifiers, Texas Instruments.
Differential Amplifiers are operational amplifiers configured to amplify ...
Description:
Differential Amplifiers are operational amplifiers configured to amplify differential input signals but to supress or reject common-mode signals; they incorporate on-chip resistors to define the differential gain. Differential Amplifiers, Texas Instruments. Instrumentation Amplifiers, Texas Instruments.