Differential Amplifiers

A differential amplifier is a type of electronic amplifier that increases the difference between two input voltages. Differential amplifiers also suppress voltage to be common to the two inputs. A digital amplifier is one of the most used and important components within integrated circuits (ICs).

Differential Amplifier 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 will 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, such as 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 also be configured to operate as a 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 do CMRR and PSRR stand for?

  • CMRR is the abbreviated version of Common Mode Rejection Ratio and refers to the power ratio of differential gains between the common-mode gain. This unit is measured in positive decibels.
  • PSRR is the abbreviated version of Power Supply Rejection Ratio and refers to an amplifiers ability to consistently maintain output voltage white the DC voltage supplied is varied.

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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. 709-7070
Mfr. Part No.AD8216YRZ
HK$39.73
Each
units
Single 5 V - 0.5mV 0.4MΩ 9.54dB - 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 806-7903
Mfr. Part No.AD8216WYRZ
HK$44.155
Each (In a Pack of 2)
units
Single 4.5 → 5.5 V - ±0.5 (Typical)mV 200 (Common Mode) kΩ, 400 (Differential) kΩ 3 (Typical)V/V 3MHz - - 1 Surface Mount SOIC 8 -
RS Stock No. 759-1297
Mfr. Part No.AD8276ARZ
HK$24.21
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. 121-6909
Mfr. Part No.ADA4927-1YCPZ-R2
HK$73.783
Each (On a Reel of 250)
units
Dual, Single 5 V ±5V 5.2mV 7.5kΩ 1V/V 2GHz -70dB - 1 Surface Mount LFCSP 16 -
RS Stock No. 807-1665
Mfr. Part No.ADA4927-1YCPZ-R2
HK$100.45
Each
units
Dual, Single 5 V ±5V 5.2mV 7.5kΩ 1V/V 2GHz -70dB - 1 Surface Mount LFCSP 16 -
RS Stock No. 778-5118
Mfr. Part No.AD8476BRMZ
HK$61.56
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. 761-8582
Mfr. Part No.LT1994CMS8#PBF
HK$39.11
Each
units
Single 3 V - ±3mV .0045MΩ 100dB 70MHz 55dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
RS Stock No. 806-8010
Mfr. Part No.AD8479ARZ
HK$65.55
Each
units
Dual - ±2.5 → ±18V 3mV - - 130MHz 80dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 858-0683
Mfr. Part No.LT1990IS8#PBF
HK$35.154
Each (In a Pack of 5)
units
Single 2.7 → 36 V - 6.7mV 2MΩ - 105kHz 57dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 912-9936
Mfr. Part No.ADA4940-2ACPZ-R7
HK$44.018
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. 820-9454
Mfr. Part No.AD8274ARMZ
HK$25.966
Each (In a Pack of 5)
units
Dual - ±2.5 → ±18V 1100µV 9kΩ - 10MHz 83dB - 1 Surface Mount MSOP 8 -
RS Stock No. 806-7938
Mfr. Part No.AD8271ARMZ
HK$30.93
Each (In a Pack of 2)
units
Dual - ±2.5 → ±18V 1500µV 1GΩ - 20MHz 80dB - 1 Surface Mount MSOP 10 Rail to Rail Input
RS Stock No. 764-8794
Mfr. Part No.ADA4932-2YCPZ-R7
HK$99.82
Each
units
Dual, Single 3 → 11 V ±5V 2.2mV 11MΩ 66dB 1GHz -100dB - 2 Surface Mount LFCSP VQ 24 -
New
RS Stock No. 216-8470
Mfr. Part No.AD628ARMZ-R7
HK$28.858
Each (On a Reel of 1000)
units
Dual, Single 4.5 → 36 V ±2.25 to ±18V ±1.5mV - - 600kHz - - 1 - MSOP 8 No
RS Stock No. 160-2822
Mfr. Part No.AD8137YCPZ-R2
HK$29.293
Each (On a Reel of 250)
units
Dual, Single 12 V ±6V 2.75mV 800kΩ 91dB 110MHz 62dB - 1 Surface Mount LFCSP 8 Rail to Rail Output
RS Stock No. 709-6070
Mfr. Part No.AD629BNZ
HK$116.17
Each
units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 0.5mV 0.8MΩ 0dB - 86dB - 1 Through Hole PDIP 8 -
RS Stock No. 822-5881
Mfr. Part No.LT1990ACS8#PBF
HK$42.20
Each (In a Pack of 2)
units
Single 2.7 to 36 V - 3mV 0.5 (Common Mode) MΩ, 2 (Differential Mode) MΩ - 100kHz - - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 822-5783
Mfr. Part No.LTC6406IUD#PBF
HK$82.13
Each
units
Single 2.7 → 3.5 V - ±5mV 3 (Differential Mode) kΩ, 130 (Common Mode) kΩ 90dB 3GHz - - 1 Surface Mount QFN 16 Rail to Rail Input
RS Stock No. 497-3700
Mfr. Part No.AD8132ARZ
HK$42.58
Each
units
Dual, Single 3 V, 5 V, 9 V ±3 V, ±5 V 3.5mV 3MΩ 0.129dB - - - 1 Surface Mount SOIC 8 -
New
RS Stock No. 216-8471
Mfr. Part No.AD628ARMZ-R7
HK$48.05
Each (In a Pack of 2)
units
Dual, Single 4.5 → 36 V ±2.25 to ±18V ±1.5mV - - 600kHz - - 1 - MSOP 8 No