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. 912-6145
Mfr. Part No.AD698APZ
$48.891
Each (In a Tube of 39)
units
- 17.5 V 13V - - - - - - - Surface Mount PLCC 28 -
RS Stock No. 697-6988
Mfr. Part No.AD698APZ
$56.24
Each
units
- 17.5 V 13V - - - - - - - Surface Mount PLCC 28 -
RS Stock No. 538-8434
Mfr. Part No.AD8205YRZ
$5.31
Each (In a Pack of 5)
units
Single 5 V - 2mV 0.4MΩ 33.98dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 661-2551
Mfr. Part No.TL592B-8D
$2.40
Each
units
Dual - ±6V - 0.004MΩ - - 60dB - 1 Surface Mount SOIC 8 -
RS Stock No. 162-5551
Mfr. Part No.TL592B-8D
$2.083
Each (In a Tube of 75)
units
Dual - ±6V - 0.004MΩ - - 60dB - 1 Surface Mount SOIC 8 -
RS Stock No. 111-2244
Mfr. Part No.AD8205YRZ
$3.581
Each (In a Tube of 98)
units
Single 5 V - 2mV 0.4MΩ 33.98dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 697-6953
Mfr. Part No.AD598JRZ
$71.16
Each
units
- - - - - - - - - - Surface Mount SOIC W 20 -
RS Stock No. 218-8382
Mfr. Part No.INA117KU
$13.11
Each
units
Dual - ±15V 2mV 0.8MΩ 0dB - 66dB - 1 Surface Mount SOIC 8 -
RS Stock No. 912-7684
Mfr. Part No.AD598JRZ
$62.361
Each (In a Tube of 37)
units
- - - - - - - - - - Surface Mount SOIC W 20 -
RS Stock No. 100-0768
Mfr. Part No.INA117KU
$9.044
Each (In a Tube of 75)
units
Dual - ±15V 2mV 0.8MΩ 0dB - 66dB - 1 Surface Mount SOIC 8 -
RS Stock No. 145-6906
Mfr. Part No.THS4509RGTT
$9.423
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. 922-3255
Mfr. Part No.THS4511RGTT
$13.175
Each (On a Reel of 250)
units
- - - - - - - - - - - - - -
RS Stock No. 159-7867
Mfr. Part No.AD8203YRMZ
$4.53
Each (In a Tube of 50)
units
Single 5 V - 2mV 0.38MΩ - 60kHz 80dB - 2 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 230-551
Mfr. Part No.AD629ARZ
$11.87
Each
units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 1mV 0.8MΩ 0dB - 77dB - 1 Surface Mount SOIC 8 -
RS Stock No. 408-697
Mfr. Part No.LMH6552MA/NOPB
$14.53
Each
units
Dual, Single 5 V, 9 V ±3 V, ±5 V 16.5mV 0.000015MΩ 0dB - - - 1 Surface Mount SOIC 8 -
RS Stock No. 106-6377
Mfr. Part No.AD629ARZ
$8.363
Each (In a Tube of 98)
units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 1mV 0.8MΩ 0dB - 77dB - 1 Surface Mount SOIC 8 -
RS Stock No. 162-6741
Mfr. Part No.THS4531ID
$4.091
Each (In a Tube of 75)
units
Single 2.5 → 5.5 V - ±2000µV 200kΩ 114dB 27MHz 90dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 145-7417
Mfr. Part No.AD8278BRZ
$4.423
Each (In a Tube of 98)
units
Dual, Single 2 → 36 V ±2 → ±18V 500µV 120kΩ - 1MHz 74dB - 1 Surface Mount SOIC 8 -
RS Stock No. 177-7172
Mfr. Part No.LT6350CMS8#PBF
$6.853
Each (In a Tube of 50)
units
Single 2.7 → 12 V - 1.5mV 4MΩ - 115MHz 96dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
RS Stock No. 764-8788
Mfr. Part No.ADA4940-2ACPZ-R7
$8.63
Each
units
Single 5 V - 0.35mV 33kΩ 99dB 260MHz 86dB - 2 Surface Mount LFCSP VQ 24 Rail to Rail Output
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