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. 786-3362
Mfr. Part No.AD8476ARMZ
$7.70
Each
units
Dual 3 → 18 V ±1.5 → ±9V 900µV - 1V/V 6MHz - - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 806-8010
Mfr. Part No.AD8479ARZ
$9.25
Each
units
Dual - ±2.5 → ±18V 3mV - - 130MHz 80dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 778-5118
Mfr. Part No.AD8476BRMZ
$7.86
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. 121-6906
Mfr. Part No.AD8479ARZ
$7.259
Each (In a Tube of 98)
units
Dual - ±2.5 → ±18V 3mV - - 130MHz 80dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 912-9945
Mfr. Part No.AD8476BRMZ
$7.038
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. 160-1734
Mfr. Part No.AD8278ARMZ
$3.015
Each (In a Tube of 50)
units
Dual, Single 2 → 36 V ±2 → ±18V 500µV 30 (Common Mode) kΩ, 120 (Differential) kΩ - 1MHz 74dB - 1 Surface Mount MSOP 8 -
RS Stock No. 806-7944
Mfr. Part No.AD8278ARMZ
$2.50
Each (In a Pack of 2)
units
Dual, Single 2 → 36 V ±2 → ±18V 500µV 30 (Common Mode) kΩ, 120 (Differential) kΩ - 1MHz 74dB - 1 Surface Mount MSOP 8 -
RS Stock No. 145-6433
Mfr. Part No.AD8278BRMZ
$3.981
Each (In a Tube of 50)
units
Dual, Single 2 → 36 V ±2 → ±18V 500µV 120kΩ - 1MHz 74dB - 1 Surface Mount MSOP 8 -
RS Stock No. 806-7941
Mfr. Part No.AD8278BRMZ
$3.815
Each (In a Pack of 2)
units
Dual, Single 2 → 36 V ±2 → ±18V 500µV 120kΩ - 1MHz 74dB - 1 Surface Mount MSOP 8 -
RS Stock No. 522-8455
Mfr. Part No.AMP03GPZ
$11.16
Each
units
Dual - ±6 → ± 18V 0.75mV - - - 80dB - 1 Through Hole PDIP 8 -
RS Stock No. 912-7378
Mfr. Part No.AD626ANZ
$11.808
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
$13.12
Each
units
Dual, Single 5 V ±5V 2.5mV 0.02MΩ - - 55dB - 1 Through Hole PDIP 8 -
RS Stock No. 806-7947
Mfr. Part No.AD8278ARZ
$2.615
Each (In a Pack of 2)
units
Dual, Single 2 → 36 V ±2 → ±18V - - - - 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 912-7362
Mfr. Part No.AMP03GPZ
$9.06
Each (In a Tube of 50)
units
Dual - ±6 → ± 18V 0.75mV - - - 80dB - 1 Through Hole PDIP 8 -
RS Stock No. 764-8794
Mfr. Part No.ADA4932-2YCPZ-R7
$14.51
Each
units
Dual, Single 3 → 11 V ±5V 2.2mV 11MΩ 66dB 1GHz -100dB - 2 Surface Mount LFCSP VQ 24 -
RS Stock No. 160-1735
Mfr. Part No.AD8278ARZ
$2.716
Each (In a Tube of 98)
units
Dual, Single 2 → 36 V ±2 → ±18V - - - - 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 806-7896
Mfr. Part No.AD8208WBRMZ
$6.045
Each (In a Pack of 2)
units
Single 4.5 → 5.5 V - ±2mV 220 (Common Mode) kΩ, 440 (Differential) kΩ 10V/V 70kHz 80dB - 1 Surface Mount MSOP 8 -
RS Stock No. 160-1725
Mfr. Part No.AD8208WBRMZ
$4.388
Each (In a Tube of 50)
units
Single 4.5 → 5.5 V - ±2mV 220 (Common Mode) kΩ, 440 (Differential) kΩ 10V/V 70kHz 80dB - 1 Surface Mount MSOP 8 -
RS Stock No. 159-9267
Mfr. Part No.ADA4932-2YCPZ-R7
$13.947
Each (On a Reel of 1500)
units
Dual, Single 3 → 11 V ±5V 2.2mV 11MΩ 66dB 1GHz -100dB - 2 Surface Mount LFCSP VQ 24 -
RS Stock No. 912-6628
Mfr. Part No.AD8206YRZ
$3.264
Each (In a Tube of 98)
units
Single 5 V - 2mV 0.4MΩ 26.02dB 100kHz 76dB - 1 Surface Mount SOIC 8 -