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How to Select Differential Amplifier ChipsHow to Select Differential Amplifier ChipsHow to Select Differential Amplifier Chips

Image Credit: Texas Instruments High-Performance Analog

 

Differential amplifier chips are designed to amplify the difference between two input signals. They can amplify a small difference between two signal levels and ignore any common level shared between them. This is particularly useful when the signal has traveled some distance and may have some added interference. If the signal travels over one of a pair of wires, the difference in potential between the wires can be assumed to be the signal.

 

Differential amplifier chips or differential amps can reject any voltages common to both wires as noise caused by interference on both wires. For example, a differential amplifier chip can compensate for transmission losses over unshielded twisted pair (UTP) CAT-5 cables.

 

A differential amplifier chip can also be used to control feedback. The second input to the amplifier chip is used to control the amplifier circuit. If necessary, a differential amp can be used to combine two signals.

 

Most integrated amplifier circuits have differential amplifier input stages and can amplify the difference between two given input levels. For example, a differential amplifier can split a signal without loss, such as in cable splitter modules and multi-tuner cable set-top boxes.


Specifications

 

Specifications for differential amplifier chips include:

 

  • -3 dB bandwidth
  • Gain
  • Minimum gain
  • Supply voltage
  • Supply current
  • Offset voltage
  • Slew rate
  • Harmonic distortion (second and third harmonics)

 

Features

 

Features for differential amplifier chips include:

 

  • Standard packaging - As part of an integrated circuit chip an amplifier differential can be manufactured with standard packaging designs such as mini small outline package (MSOP).
  • Number of leads (such as 8, 20, or 28 leads)
  • Power-down features


Standards

 

Differential amplifier chips that meet U.S. military specifications are manufactured according to standards described in MIL-STD-750 (Test Method Standard for Semiconductor Devices) and MIL-HDBK-6100 (Military Handbook, List Of Case Outlines and Dimensions for Discrete Semiconductor Devices).

 

Differential amplifier chips that are marketed in Europe need to be manufactured in compliance with the Restriction of Hazardous Substances (RoHS) and the Waste Electrical and Electronic Equipment (WEEE) Directives.

 

SMD 5962-07222 - MICROCIRCUIT, LINEAR, WIDEBAND, DIFFERENTIAL OPERATIONAL AMPLIFIER, MONOLITHIC SILICON

SMD 5962-08218 - MICROCIRCUIT, LINEAR, RADIATION HARDENED, DIFFERENTIAL AMPLIFIER, MONOLITHIC SILICON 

SMD 5962-84185 - MICROCIRCUIT, LINEAR, TWO-STAGE DIFFERENTIAL VIDEO AMPLIFIER, MONOLITHIC SILICON