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
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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.
813-6542
Mfr. Part No.INA149AID
BrandTexas Instruments
|
MYR29.05
Each
units
|
Dual, Single | 4 → 36 V | ±2 → ±18V | 1100µV | - | 1V/V | - | 90dB | - | 1 | Surface Mount | SOIC | 8 | - |
|
|
RS Stock No.
921-2883
Mfr. Part No.INA149AID
BrandTexas Instruments
|
MYR28.368
Each (In a Tube of 75)
units
|
Dual, Single | 4 → 36 V | ±2 → ±18V | 1100µV | - | 1V/V | - | 90dB | - | 1 | Surface Mount | SOIC | 8 | - |
|
RS Stock No.
912-8703
Mfr. Part No.AD629BRZ
BrandAnalog Devices
|
MYR39.662
Each (In a Tube of 98)
units
|
Dual | - | ±12 V, ±15 V, ±3 V, ±5 V, ±9 V | 0.5mV | 0.8MΩ | 0dB | - | 86dB | - | 1 | Surface Mount | SOIC | 8 | - |
|
|
RS Stock No.
427-008
Mfr. Part No.AD629BRZ
BrandAnalog Devices
|
MYR47.98
Each
units
|
Dual | - | ±12 V, ±15 V, ±3 V, ±5 V, ±9 V | 0.5mV | 0.8MΩ | 0dB | - | 86dB | - | 1 | Surface Mount | SOIC | 8 | - |
|
RS Stock No.
647-659
Mfr. Part No.INA105KP
BrandTexas Instruments
|
MYR52.33
Each
units
|
Dual | - | ±15V | 0.5mV | 0.05MΩ | 0dB | - | 72dB | - | 1 | Through Hole | PDIP | 8 | - |
|
|
RS Stock No.
100-0744
Mfr. Part No.INA105KP
BrandTexas Instruments
|
MYR37.358
Each (In a Tube of 50)
units
|
Dual | - | ±15V | 0.5mV | 0.05MΩ | 0dB | - | 72dB | - | 1 | Through Hole | PDIP | 8 | - |
|
RS Stock No.
121-8455
Mfr. Part No.INA106KP
BrandTexas Instruments
|
MYR50.704
Each (In a Tube of 50)
units
|
Dual | - | ±15V | 0.5mV | 0.11MΩ | 20dB | - | 86dB | - | 1 | Through Hole | PDIP | 8 | - |
|
|
RS Stock No.
647-665
Mfr. Part No.INA106KP
BrandTexas Instruments
|
MYR59.72
Each
units
|
Dual | - | ±15V | 0.5mV | 0.11MΩ | 20dB | - | 86dB | - | 1 | Through Hole | PDIP | 8 | - |
|
RS Stock No.
822-5828
Mfr. Part No.LTC1992CMS8#PBF
BrandLinear Technology
|
MYR14.055
Each (In a Pack of 2)
units
|
Dual, Single | 2.7 → 11 V | ±1.35 → ±5V | ±2.5mV | 500MΩ | 80dB | 3MHz | - | - | 1 | Surface Mount | MSOP | 8 | Rail to Rail Output |
|
|
RS Stock No.
145-1135
Mfr. Part No.LTC1992CMS8#PBF
BrandLinear Technology
|
MYR12.014
Each (In a Tube of 50)
units
|
Dual, Single | 2.7 → 11 V | ±1.35 → ±5V | ±2.5mV | 500MΩ | 80dB | 3MHz | - | - | 1 | Surface Mount | MSOP | 8 | Rail to Rail Output |
|
RS Stock No.
160-1726
Mfr. Part No.AD8216WYRZ
BrandAnalog Devices
|
MYR15.167
Each (In a Tube of 98)
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.
912-9945
Mfr. Part No.AD8476BRMZ
BrandAnalog Devices
|
MYR25.968
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.
517-0356
Mfr. Part No.THS4509RGTT
BrandTexas Instruments
|
MYR42.35
Each
units
|
Dual, Single | 5 V | ±2.5V | 4mV | 0.05MΩ | 68dB | 3GHz | - | - | 1 | Surface Mount | QFN | 16 | - |
|
RS Stock No.
778-5118
Mfr. Part No.AD8476BRMZ
BrandAnalog Devices
|
MYR25.54
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.
806-7903
Mfr. Part No.AD8216WYRZ
BrandAnalog Devices
|
MYR27.11
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.
527-580
Mfr. Part No.THS4131CD
BrandTexas Instruments
|
MYR35.67
Each
units
|
Dual, Single | 5 V | ±15V | 2mV | 34MΩ | 78dB | 225MHz | 80dB | - | 1 | Surface Mount | SOIC | 8 | - |
|
|
RS Stock No.
145-6906
Mfr. Part No.THS4509RGTT
BrandTexas Instruments
|
MYR36.754
Each (On a Reel of 250)
units
|
Dual, Single | 5 V | ±2.5V | 4mV | 0.05MΩ | 68dB | 3GHz | - | - | 1 | Surface Mount | QFN | 16 | - |
|
RS Stock No.
661-2511
Mfr. Part No.THS4131CDGK
BrandTexas Instruments
|
MYR35.45
Each
units
|
Dual, Single | 5 V | ±15V | 2mV | 34MΩ | 78dB | 225MHz | 80dB | - | 1 | Surface Mount | MSOP | 8 | - |
|
RS Stock No.
160-9813
Mfr. Part No.ADA4830-1BCPZ-R7
BrandAnalog Devices
|
MYR4.895
Each (On a Reel of 1500)
units
|
Single | 2.9 → 5.5 V | ±1.5 → ±5V | - | 20kΩ | - | 84MHz | 45dB | - | 1 | Surface Mount | LFCSP | 8 | Rail to Rail Output |
|
RS Stock No.
912-7378
Mfr. Part No.AD626ANZ
BrandAnalog Devices
|
MYR44.401
Each (In a Tube of 50)
units
|
Dual, Single | 5 V | ±5V | 2.5mV | 0.02MΩ | - | - | 55dB | - | 1 | Through Hole | PDIP | 8 | - |
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