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. 522-8455
Mfr. Part No.AMP03GPZ
£7.48
Each
Units
Dual - ±6 → ± 18V 0.75mV - - - 80dB - 1 Through Hole PDIP 8 -
RS Stock No. 378-2733
Mfr. Part No.INA133UA
£2.47
Each
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Dual, Single 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V ±15V 1.5mV 0.05MΩ 0dB - 74dB - 1 Surface Mount SOIC 8 -
RS Stock No. 912-8801
Mfr. Part No.AD8137YRZ
£1.73
Each (In a Tube of 98)
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Dual, Single 3 V, 5 V, 9 V ±3 V, ±5 V 2.7mV 0.8MΩ 0.172dB - 62dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 779-9561
Mfr. Part No.LT1990CS8#PBF
£2.47
Each (In a Pack of 2)
Units
Dual, Single 2.7 → 36 V ±250V 4.5mV 2MΩ - 105kHz 58dB - 2 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 145-6212
Mfr. Part No.LT1990CS8#PBF
£1.603
Each (In a Tube of 100)
Units
Dual, Single 2.7 → 36 V ±250V 4.5mV 2MΩ - 105kHz 58dB - 2 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 496-7165
Mfr. Part No.AD8137YRZ
£2.294
Each (In a Pack of 5)
Units
Dual, Single 3 V, 5 V, 9 V ±3 V, ±5 V 2.7mV 0.8MΩ 0.172dB - 62dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 121-6909
Mfr. Part No.ADA4927-1YCPZ-R2
£5.716
Each (On a Reel of 250)
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Dual, Single 5 V ±5V 5.2mV 7.5kΩ 1V/V 2GHz -70dB - 1 Surface Mount LFCSP 16 -
RS Stock No. 759-0055
Mfr. Part No.AD8277ARZ
£3.21
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Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 2 Surface Mount SOIC 14 Rail to Rail Output
RS Stock No. 807-1665
Mfr. Part No.ADA4927-1YCPZ-R2
£8.05
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Dual, Single 5 V ±5V 5.2mV 7.5kΩ 1V/V 2GHz -70dB - 1 Surface Mount LFCSP 16 -
RS Stock No. 162-9862
Mfr. Part No.THS4541IRGTT
£4.251
Each (On a Reel of 250)
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Single 3 V - 850µV - 119dB 850MHz 85dB - 1 Surface Mount QFN 16 Rail to Rail Output
RS Stock No. 764-8788
Mfr. Part No.ADA4940-2ACPZ-R7
£4.95
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Single 5 V - 0.35mV 33kΩ 99dB 260MHz 86dB - 2 Surface Mount LFCSP VQ 24 Rail to Rail Output
RS Stock No. 761-8582
Mfr. Part No.LT1994CMS8#PBF
£3.03
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Single 3 V - ±3mV .0045MΩ 100dB 70MHz 55dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
RS Stock No. 914-3046
Mfr. Part No.THS4541IRGTT
£4.97
Each
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Single 3 V - 850µV - 119dB 850MHz 85dB - 1 Surface Mount QFN 16 Rail to Rail Output
RS Stock No. 786-3362
Mfr. Part No.AD8476ARMZ
£4.21
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Dual 3 → 18 V ±1.5 → ±9V 900µV - 1V/V 6MHz - - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 912-9936
Mfr. Part No.ADA4940-2ACPZ-R7
£3.145
Each (On a Reel of 1500)
Units
Single 5 V - 0.35mV 33kΩ 99dB 260MHz 86dB - 2 Surface Mount LFCSP VQ 24 Rail to Rail Output
RS Stock No. 824-7020
Mfr. Part No.LME49724MR/NOPB
£2.13
Each (In a Pack of 2)
Units
Dual - ±2.5 → ±18V - - - 50MHz - - 1 Surface Mount SOIC 8 -
RS Stock No. 111-2244
Mfr. Part No.AD8205YRZ
£2.011
Each (In a Tube of 98)
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Single 5 V - 2mV 0.4MΩ 33.98dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 538-8434
Mfr. Part No.AD8205YRZ
£2.616
Each (In a Pack of 5)
Units
Single 5 V - 2mV 0.4MΩ 33.98dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 178-8879
Mfr. Part No.LME49724MR/NOPB
£2.788
Each (In a Tube of 95)
Units
- - - - - - - - - - - - - -
RS Stock No. 912-7684
Mfr. Part No.AD598JRZ
£33.61
Each (In a Tube of 37)
Units
- - - - - - - - - - Surface Mount SOIC W 20 -
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