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
Differential Amplifiers
223
Filters
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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RS Stock No.
647-659
Mfr. Part No.INA105KP
BrandTexas Instruments
|
$13.35
Each
units
|
Dual | - | ±15V | 0.5mV | 0.05MΩ | 0dB | - | 72dB | - | 1 | Through Hole | PDIP | 8 | - |
|
RS Stock No.
786-3362
Mfr. Part No.AD8476ARMZ
BrandAnalog Devices
|
$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.
100-0744
Mfr. Part No.INA105KP
BrandTexas Instruments
|
$10.712
Each (In a Tube of 50)
units
|
Dual | - | ±15V | 0.5mV | 0.05MΩ | 0dB | - | 72dB | - | 1 | Through Hole | PDIP | 8 | - |
|
RS Stock No.
779-9561
Mfr. Part No.LT1990CS8#PBF
BrandAnalog Devices
|
$4.875
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
BrandAnalog Devices
|
$3.165
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.
912-9945
Mfr. Part No.AD8476BRMZ
BrandAnalog Devices
|
$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.
121-6906
Mfr. Part No.AD8479ARZ
BrandAnalog Devices
|
$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.
806-8010
Mfr. Part No.AD8479ARZ
BrandAnalog Devices
|
$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
BrandAnalog Devices
|
$8.25
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.
806-7941
Mfr. Part No.AD8278BRMZ
BrandAnalog Devices
|
$4.195
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.
806-7944
Mfr. Part No.AD8278ARMZ
BrandAnalog Devices
|
$2.75
Each (In a Pack of 2)
units
|
Dual, Single | 2 → 36 V | ±2 → ±18V | 500µV | 120 (Differential) kΩ, 30 (Common Mode) kΩ | - | 1MHz | 74dB | - | 1 | Surface Mount | MSOP | 8 | - |
|
|
RS Stock No.
145-6433
Mfr. Part No.AD8278BRMZ
BrandAnalog Devices
|
$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.
160-1734
Mfr. Part No.AD8278ARMZ
BrandAnalog Devices
|
$3.015
Each (In a Tube of 50)
units
|
Dual, Single | 2 → 36 V | ±2 → ±18V | 500µV | 120 (Differential) kΩ, 30 (Common Mode) kΩ | - | 1MHz | 74dB | - | 1 | Surface Mount | MSOP | 8 | - |
|
RS Stock No.
162-5551
Mfr. Part No.TL592B-8D
BrandTexas Instruments
|
$1.875
Each (In a Tube of 75)
units
|
Dual | - | ±6V | - | 0.004MΩ | - | - | 60dB | - | 1 | Surface Mount | SOIC | 8 | - |
|
RS Stock No.
462-0715
Mfr. Part No.THS4130ID
BrandTexas Instruments
|
$10.72
Each
units
|
Dual, Single | 5 V | ±15V | 2mV | 34MΩ | 78dB | 225MHz | 80dB | - | 1 | Surface Mount | SOIC | 8 | - |
|
RS Stock No.
160-1725
Mfr. Part No.AD8208WBRMZ
BrandAnalog Devices
|
$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.
912-7362
Mfr. Part No.AMP03GPZ
BrandAnalog Devices
|
$9.06
Each (In a Tube of 50)
units
|
Dual | - | ±6 → ± 18V | 0.75mV | - | - | - | 80dB | - | 1 | Through Hole | PDIP | 8 | - |
|
RS Stock No.
806-7947
Mfr. Part No.AD8278ARZ
BrandAnalog Devices
|
$2.875
Each (In a Pack of 2)
units
|
Dual, Single | 2 → 36 V | ±2 → ±18V | - | - | - | - | 80dB | - | 1 | Surface Mount | SOIC | 8 | - |
|
|
RS Stock No.
806-7896
Mfr. Part No.AD8208WBRMZ
BrandAnalog Devices
|
$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.
100-3878
Mfr. Part No.THS4130IDGN
BrandTexas Instruments
|
$9.70
Each (In a Tube of 80)
units
|
Dual, Single | 5 V | ±15V | 2mV | 34MΩ | 78dB | 225MHz | 80dB | - | 1 | Surface Mount | MSOP | 8 | - |
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