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. 697-6988
Mfr. Part No.AD698APZ
SGD50.77
Each
units
- 17.5 V 13V - - - - - - - Surface Mount PLCC 28 -
RS Stock No. 912-6145
Mfr. Part No.AD698APZ
SGD46.01
Each (In a Tube of 39)
units
- 17.5 V 13V - - - - - - - Surface Mount PLCC 28 -
RS Stock No. 912-7561
Mfr. Part No.AD628ARMZ
SGD5.767
Each (In a Tube of 50)
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 MSOP 8 -
RS Stock No. 809-9288
Mfr. Part No.AD8207WBRZ
SGD7.97
Each
units
Single 3.3 → 5.5 V - 100µV - 20V/V 150kHz 80dB - 1 Surface Mount SOIC 8 No
RS Stock No. 230-551
Mfr. Part No.AD629ARZ
SGD10.94
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. 759-0042
Mfr. Part No.AD8276ARMZ
SGD3.40
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. 647-659
Mfr. Part No.INA105KP
SGD13.33
Each
units
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
RS Stock No. 106-6377
Mfr. Part No.AD629ARZ
SGD7.697
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. 851-6821
Mfr. Part No.LT6350CMS8#PBF
SGD7.315
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. 160-3354
Mfr. Part No.AD8207WBRZ
SGD5.455
Each (In a Tube of 98)
units
Single 3.3 → 5.5 V - 100µV - 20V/V 150kHz 80dB - 1 Surface Mount SOIC 8 No
RS Stock No. 100-0744
Mfr. Part No.INA105KP
SGD11.239
Each (In a Tube of 50)
units
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
RS Stock No. 538-6595
Mfr. Part No.AD628ARMZ
SGD6.82
Each
units
Dual, Single 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 3mV 0.22MΩ 40dB - 75dB - 2 Surface Mount MSOP 8 -
RS Stock No. 177-7172
Mfr. Part No.LT6350CMS8#PBF
SGD6.231
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. 154-6359
Mfr. Part No.LT1994CDD#PBF
SGD3.965
Each (In a Tube of 121)
units
Single 3 V - ±3mV .0045MΩ 100dB 70MHz 55dB - 2 Surface Mount DFN 8 Rail to Rail Input/Output
RS Stock No. 155-7739
Mfr. Part No.LTC6409CUDB#TRMPBF
SGD11.62
Each (On a Reel of 500)
units
Single 2.7 → 5.25 V - ±1400µV 165 (Common Mode) kΩ, 860 (Differential Mode) Ω 65dB 10GHz - - 1 Surface Mount QFN 10 -
RS Stock No. 522-8455
Mfr. Part No.AMP03GPZ
SGD11.01
Each
units
Dual - ±6 → ± 18V 0.75mV - - - 80dB - 1 Through Hole PDIP 8 -
RS Stock No. 661-2397
Mfr. Part No.INA159AIDGKT
SGD5.84
Each
units
Single 3 V, 5 V - 0.5mV 0.24MΩ 13.98dB - 80dB - 1 Surface Mount MSOP 8 Rail to Rail Input
RS Stock No. 912-8810
Mfr. Part No.AD8139ARDZ
SGD9.396
Each (In a Tube of 98)
units
Dual, Single 5 V, 9 V ±3 V, ±5 V 0.5mV 1.5MΩ 0.009dB - 75dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 697-7252
Mfr. Part No.AD8275ARMZ
SGD6.26
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. 813-6542
Mfr. Part No.INA149AID
SGD9.65
Each
units
Dual, Single 4 → 36 V ±2 → ±18V 1100µV - 1V/V - 90dB - 1 Surface Mount SOIC 8 -
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