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. 538-6595
Mfr. Part No.AD628ARMZ
R 95.38
Each
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. 912-7561
Mfr. Part No.AD628ARMZ
R 57.633
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. 145-6212
Mfr. Part No.LT1990CS8#PBF
R 33.504
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. 522-8685
Mfr. Part No.AD626ANZ
R 210.51
Each
units
Dual, Single 5 V ±5V 2.5mV 0.02MΩ - - 55dB - 1 Through Hole PDIP 8 -
RS stock no. 779-9561
Mfr. Part No.LT1990CS8#PBF
R 51.60
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. 912-7378
Mfr. Part No.AD626ANZ
R 165.06
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. 912-7684
Mfr. Part No.AD598JRZ
R 590.521
Each (In a Tube of 37)
units
- - - - - - - - - - Surface Mount SOIC W 20 -
RS stock no. 697-6953
Mfr. Part No.AD598JRZ
R 625.67
Each
units
- - - - - - - - - - Surface Mount SOIC W 20 -
RS stock no. 806-7947
Mfr. Part No.AD8278ARZ
R 45.45
Each (In a Pack of 2)
units
Dual, Single 2 → 36 V ±2 → ±18V - - - - 80dB - 1 Surface Mount SOIC 8 -
RS stock no. 462-0721
Mfr. Part No.THS4130IDGN
R 141.56
Each
units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount MSOP 8 -
RS stock no. 160-1735
Mfr. Part No.AD8278ARZ
R 27.426
Each (In a Tube of 98)
units
Dual, Single 2 → 36 V ±2 → ±18V - - - - 80dB - 1 Surface Mount SOIC 8 -
RS stock no. 100-3878
Mfr. Part No.THS4130IDGN
R 109.535
Each (In a Tube of 80)
units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount MSOP 8 -
RS stock no. 100-0744
Mfr. Part No.INA105KP
R 112.436
Each (In a Tube of 50)
units
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
RS stock no. 162-5020
Mfr. Part No.INA143U
R 48.716
Each (In a Tube of 75)
units
Dual, Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±15V 0.5mV 0.055MΩ 20dB - 86dB - 1 Surface Mount SOIC 8 -
RS stock no. 162-5519
Mfr. Part No.THS4131CDGK
R 100.308
Each (In a Tube of 80)
units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount MSOP 8 -
RS stock no. 824-7052
Mfr. Part No.LMH6553MRE/NOPB
R 111.11
Each
units
Single 4.5 → 12 V - - 15Ω 1.008V/V 875MHz 80dB - 1 Surface Mount SOIC 8 -
RS stock no. 178-8879
Mfr. Part No.LME49724MR/NOPB
R 52.499
Each (In a Tube of 95)
units
- - - - - - - - - - - - - -
RS stock no. 661-2536
Mfr. Part No.THS4141ID
R 151.35
Each
units
Dual, Single 5 V ±15V 7mV 14.4MΩ 67dB - 75dB - 1 Surface Mount SOIC 8 -
RS stock no. 661-2511
Mfr. Part No.THS4131CDGK
R 123.49
Each
units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount MSOP 8 -
RS stock no. 814-4004
Mfr. Part No.THS4524IDBT
R 121.91
Each
units
Dual, Single 2.5 → 5.5 V ±1.25 → ±2.75V ±2mV 110kΩ 116dB 93MHz 80dB - 1 Surface Mount TSSOP 38 Rail to Rail Output