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庫存編號 851-6821
製造零件編號LT6350CMS8#PBF
HK$41.595
/個 (每包:2個)
單位
Single 2.7 → 12 V - 1.5mV 4MΩ - 115MHz 96dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
RS庫存編號 177-7172
製造零件編號LT6350CMS8#PBF
HK$35.503
毎管:50 個
單位
Single 2.7 → 12 V - 1.5mV 4MΩ - 115MHz 96dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
RS庫存編號 145-1135
製造零件編號LTC1992CMS8#PBF
HK$21.571
毎管:50 個
單位
Dual, Single 2.7 → 11 V ±1.35 → ±5V ±2.5mV 500MΩ 80dB 3MHz - - 1 Surface Mount MSOP 8 Rail to Rail Output
RS庫存編號 155-7739
製造零件編號LTC6409CUDB#TRMPBF
HK$62.059
個 (在毎卷:500)
單位
Single 2.7 → 5.25 V - ±1400µV 165 (Common Mode) kΩ, 860 (Differential Mode) Ω 65dB 10GHz - - 1 Surface Mount QFN 10 -
RS庫存編號 155-9350
製造零件編號LTC6403IUD-1#PBF
HK$29.552
毎管:121 個
單位
Single 2.7 → 5.25 V - ±2mV 1.7 (Common Mode) MΩ, 14 (Differential Mode) kΩ 90 200MHz 50dB - 1 Surface Mount QFN 16 Rail to Rail Output
RS庫存編號 851-6859
製造零件編號LTC6362IMS8#PBF
HK$31.932
/個 (每包:5個)
單位
Single 2.8 → 5.25 V - ±30mV 230kΩ 95dB 180MHz 75dB - 1 Surface Mount MSOP 8 Rail to Rail Input/Output
RS庫存編號 786-9733
製造零件編號LT6600CS8-5#PBF
HK$57.66
單位
Dual, Single 5 V ±5V 35mV 7.7kΩ - - - - 1 Surface Mount SOIC 8 -
RS庫存編號 822-5828
製造零件編號LTC1992CMS8#PBF
HK$28.12
/個 (每包:2個)
單位
Dual, Single 2.7 → 11 V ±1.35 → ±5V ±2.5mV 500MΩ 80dB 3MHz - - 1 Surface Mount MSOP 8 Rail to Rail Output
RS庫存編號 155-7495
製造零件編號LTC6406IUD#PBF
HK$49.504
毎管:121 個
單位
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庫存編號 851-6875
製造零件編號LTC1992-2CMS8#PBF
HK$70.12
單位
Dual, Single 2.7 → 11 V ±5V ±18mV 500MΩ 80dB 3.2MHz 69dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS庫存編號 823-0041
製造零件編號LTC6409CUDB#TRMPBF
HK$96.25
單位
Single 2.7 → 5.25 V - ±1400µV 165 (Common Mode) kΩ, 860 (Differential Mode) Ω 65dB 10GHz - - 1 Surface Mount QFN 10 -
RS庫存編號 822-5783
製造零件編號LTC6406IUD#PBF
HK$59.82
單位
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庫存編號 155-6747
製造零件編號LT6600CS8-5#PBF
HK$37.622
毎管:100 個
單位
Dual, Single 5 V ±5V 35mV 7.7kΩ - - - - 1 Surface Mount SOIC 8 -
RS庫存編號 858-0683
製造零件編號LT1990IS8#PBF
HK$26.472
/個 (每包:5個)
單位
Single 2.7 → 36 V - 6.7mV 2MΩ - 105kHz 57dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS庫存編號 858-0620
製造零件編號LTC6403IUD-1#PBF
HK$33.645
/個 (每包:2個)
單位
Single 2.7 → 5.25 V - ±2mV 1.7 (Common Mode) MΩ, 14 (Differential Mode) kΩ 90 200MHz 50dB - 1 Surface Mount QFN 16 Rail to Rail Output
RS庫存編號 786-9720
製造零件編號LT6552IS8#PBF
HK$27.79
/個 (每包:2個)
單位
Single 3.3 V - 25mV 300kΩ - 55MHz 58dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS庫存編號 761-9285
製造零件編號LTC1992IMS8#PBF
HK$37.31
單位
Dual, Single 2.7 V ±5V ±2.5mV 500MΩ 80dB 4MHz 60dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output