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.

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AD629

Difference Amplifiers

Part## ChannelsSlew RateBandwidth at min gain (tyRail-Rail OutRail-Rail InIsupply (max)CMRR (typ)THD+N (f=1kHz 10Vpp) (dB)Vos (typ)Gain (min)Nonlinearity Vos TC (typ)Minimum Input Common ModeMaximum Input Common ModeGain ErrorGain TCVNoiseDensity (typ)In Amp Architecture
AD8479 - - 130 kHz No - 650 µA 90 - 500 µV 1 5 3 µV/degC -600 V 600 V 0.01 3 ppm/C - Difference Amp
ADA4830-1Reference Circuit Available 1 220 - No Yes 6.8 mA 65 - - - - - -8.5 V 8.5 V - - - Difference Amp
AD8208 1 - 70 kHz - - 1.6 mA 80 - 20 V 20 - - -2 V 45 V - 5 - Current Sense
AD8279 2 1.4 1 MHz Yes No 200 µA 80 - 50 µV 0.5 - 0.3 µV/degC -45.3 V 40.5 V 0.2 1 47 nV/rtHz Difference Amp
AD8278 1 1.4 1 MHz Yes Yes 200 µA 80 - 100 µV 0.5 7 1 µV/degC -45.3 V 40.5 V 0.02 1 47 nV/rtHz Difference Amp
AD8277 2 1.1 550 kHz Yes Yes 200 µA 86 - 200 µV 1 5 2 µV/degC -30.2 V 27 V 0.02 1 65 nV/rtHz Difference Amp
AD8276Reference Circuit Available 1 1.1 550 kHz Yes Yes 200 µA 86 - 200 µV 1 5 2 µV/degC -30.2 V 27 V 0.02 1 65 nV/rtHz Difference Amp
AD8271Reference Circuit Available 1 30 20 MHz Yes Yes 2.6 mA 76 110 600 µV 0.5 1 2 µV/degC -15.4 V 15.4 V 0.02 2 38 Difference Amp
AD8275Reference Circuit Available 1 25 15 MHz Yes Yes 1.9 mA 86 106 500 µV 0.2 3 7 µV/degC -12.3 V 12 V 0.024 1 40 nV/rtHz Difference Amp
AD8274Reference Circuit Available 1 20 20 MHz No Yes 2.6 mA 77 112 700 µV 0.5 2 3 µV/degC -40.5 V 40.5 V 0.03 2 26 nV/rtHz Difference Amp
AD8273Reference Circuit Available 2 20 20 MHz No Yes 2.5 mA 77 112 700 µV 0.5 50 3 µV/degC -40.5 V 40.5 V 0.05 10 26 nV/rtHz Difference Amp
AD8270 2 30 20 MHz Yes Yes 2.5 mA 76 145 1000 µV 0.5 - 2 µV/degC -15.4 V 15.4 V 0.08 10 38 Difference Amp
AD628Reference Circuit Available 1 0.3 600 kHz No Yes 1.6 mA 75 - 1500 µV 0.1 5 8 µV/degC -120 V 120 V 0.1 5 300 Difference Amp
AD629Reference Circuit Available 1 2.1 500 kHz No Yes 1 mA 90 - 500 µV 1 10 10 µV/degC -270 V 270 V 0.03 10 550 Difference Amp
AD626 - 0.22 100 kHz No No 2 mA 66 - 500 µV 10 140 6 µV/degC -24 V 24 V 1 150 - Current Sense
AMP03 1 9.5 3 MHz No Yes 2.5 mA 100 - 400 V 1 - - -20 V 20 V 0.008 - 90 Difference Amp
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