Difference Amplifiers

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Difference Amplifiers

A difference amplifier is a special purpose amplifier designed to measure differential signals, otherwise known as a subtractor. A key feature of a difference amplifier is its ability to remove unwanted common mode signals, known as common mode rejection (CMR). Unlike most types of amplifiers, difference amplifiers are typically able to measure voltages beyond the supply rails, and are used in applications where large dc or ac common-mode voltages are present. They are ideal for current and voltage monitoring. We offer a range of difference amplifiers, optimized for low distortion, low power, or high voltage performance.

For higher speed and fully differential amplifiers, please see differential amplifiers. For amplifiers with higher input impedance, please see instrumentation amplifiers.

NEWS

21 Aug 2009 Tiny Difference Amps:
Small Size, Small Price, Big Performance.

NEW PRODUCTS

AD8279- Low Power, Wide Supply Range, Low Cost Difference Amplifiers, G = ½, 2

AD8279: Low Power, Wide Supply Range, Low Cost Difference Amplifiers, G = ½, 2

The AD8278 and AD8279 are general-purpose difference amplifiers intended for precision signal conditioning in power critical applications that require both high performance and low power. The AD8278 and AD8279 provide exceptional common-mode rejection ratio (80 dB) and high bandwidth while amplifying input signals that are well beyond the supply rails. The on-chip resistors are laser trimmed for More

Data Sheet Rev A, 11/2009 (pdf 656kB)
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RESOURCES & RELATED INFORMATION

Brochure: New! Improve System Performance with Linear Product Upgrades Brochure (pdf)

Solutions Bulletin: Amplifier ICs Solutions Bulletin (2008) (pdf)
Read the app note: Ways to Optimize the Performance of a Difference Amplifier (AN-589) (pdf)
Read the article: High-Side Current Sensing: Difference Amplifier vs. Current-Sense Amplifier (pdf)
Circuit Note (CN-0099): High Precision, Low Cost Current Sources Using the AD8276 Difference Amplifier and the AD8603 Op Amp (html)

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