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. Analog Devices offers a range of difference amplifiers, optimized for low distortion, low power, or high voltage performance.
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Frequently Asked Questions
- How does the input offset voltage (VOS) of an amplifier affect my circuit?
- My reference voltage changes when I connect it to the amplifier's input?
- What is the output headroom or voltage range of an amplifier and how is it determined?
- What does single-supply amplifer really mean?
- Why can't I get my amplifier to go to my full-scale output voltage?
- What is a rail-to-rail amplifier?
- How does input current noise affect my amplifier circuit?
- What is the full power bandwidth of an amplifier?
- I'm applying a dc voltage to the input of my amplifier, but I'm getting an oscillating signal out. What can be causing this?
- What is meant by the noise gain of an amplifier?
- What is the small signal bandwidth of an amplifier?
- How does the open-loop gain of an amplifier affect my circuit?
- Why does the output signal of my amplifier look like a triangle, when I have a sine wave input?
- What is unity-gain bandwidth?
- What is amplifier RF rectification?
- Why is my output signal clipping?
- Why is my input signal clipping?
- I have a large unexplained offset in my circuit. What can be causing it?
- How does the input voltage noise of an amplifier affect my circuit?
- What is input common-mode voltage range (CMVR)?
- What are op amp input and output common-mode and differential voltage ranges and how are they determined?
- Why doesn't my amplifier output go to zero when I ground the input?
- What is IP3?
- Can I exceed the parameters specified in the absolute maximum ratings table?
Rarely Asked Questions
Difference Amplifiers
| SortOrder | Part# | # of Amps | Common Mode In (min) (V) | Common Mode In (max) (V) | Input Beyond Supply | Gain (min) (V/V) | Gain (max) (V/V) | BW - low gain (typ) (Hz) | Slew Rate (typ) (V/us) | Iq/Amp (max) (A) | Vs span (min) (V) | Vs span (max) (V) | Price (1000+) ($ US) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | LT1997-1 | 1 | -300m | 80 | Yes | 0.141 | 80 | 650k | 4 | 400µ | 3.3 | 50 | $3.14 (LT1997IMS-1#PBF) |
| 2 | LT1997-2 | 1 | -255 | 255 | Yes | 0.0455 | 0.55 | 1M | 750m | 400µ | 3.3 | 50 | $3.14 (LT1997IMS-2#PBF) |
| 3 | LT1990-10 | 1 | -250 | 250 | No | 10 | 10 | 100k | 400m | 180µ | 2.4 | 36 | $1.62 (LT1990IMS8-10#PBF) |
| 4 | LT1997-3 | 1 | -160 | 160 | Yes | 0.077 | 13 | 1.1M | 750m | 400µ | 3.3 | 50 | $3.14 (LT1997IMS-3#PBF) |
| 5 | LT6376 | 1 | -230 | 230 | Yes | 10 | 10 | 160k | 4.1 | 400µ | 3.3 | 50 | $3.20 (LT6376IMS#PBF) |
| 6 | LT6375 | 1 | -270 | 270 | Yes | 1 | 1 | 375k | 2.4 | 400µ | 3.3 | 50 | $2.95 (LT6375IMS#PBF) |
| 7 | AD8479 | 1 | -600 | 600 | Yes | 1 | 1 | 130k | 7.5 | 650µ | 5 | 36 | $2.81 (AD8479ARZ) |
| 8 | ADA4830-2 | 2 | -10 | 9.5 | Yes | 0.5 | 0.5 | 84M | 300 | 10m | 2.9 | 5.5 | $0.85 (ADA4830-2BCPZ-R7) |
| 9 | ADA4830-1 | 1 | -10 | 9.5 | Yes | 0.5 | 0.5 | 84M | 300 | 10m | 2.9 | 5.5 | $0.61 (ADA4830-1BCPZ-R7) |
| 10 | AD8208 | 1 | -2 | 45 | Yes | 20 | 20 | 70k | 1 | 3m | 4.5 | 5.5 | $1.67 (AD8208WBRMZ) |
| 11 | AD8279 | 2 | -45.3 | 40.5 | Yes | 0.5 | 2 | 1M | 1.3 | 350µ | 2 | 36 | $1.60 (AD8279ARZ) |
| 12 | AD8209 | 1 | -2 | 45 | Yes | 14 | 14 | 80k | 1 | 3m | 4.5 | 5.5 | $1.67 (AD8209WBRMZ) |
| 13 | AD8278 | 1 | -45.3 | 40.5 | Yes | 0.5 | 2 | 1M | 1.4 | 200µ | 2 | 36 | $0.95 (AD8278ARMZ) |
| 14 | AD8277 | 2 | -30.2 | 27 | Yes | 1 | 1 | 550k | 1.1 | 200µ | 2 | 36 | $1.60 (AD8277ARZ) |
| 15 | AD8276 | 1 | -30.2 | 27 | Yes | 1 | 1 | 550k | 1.1 | 200µ | 2 | 36 | $0.95 (AD8276ARMZ) |
| 16 | AD8271 | 1 | -15.4 | 15.4 | Slightly | 0.5 | 2 | 20M | 30 | 2.6m | 5 | 36 | $1.25 (AD8271ARMZ) |
| 17 | AD8275 | 1 | -12.3 | 12 | Yes | 0.2 | 0.2 | 15M | 25 | 2.3m | 3.3 | 15 | $1.60 (AD8275ARMZ) |
| 18 | AD8274 | 1 | -40.5 | 40.5 | Yes | 0.5 | 2 | 20M | - | 2.6m | 5 | 36 | $1.05 (AD8274ARMZ) |
| 19 | AD8273 | 2 | -40.5 | 40.5 | Yes | 0.5 | 3 | 20M | 20 | 2.5m | 5 | 36 | $1.60 (AD8273ARZ) |
| 20 | AD8270 | 2 | -15.4 | 15.4 | Slightly | 0.5 | 2 | 20M | 30 | 2.5m | 5 | 36 | $1.91 (AD8270ACPZ-R7) |
| 21 | LT1996 | 1 | -60 | 60 | Yes | 9 | 117 | 560k | 120m | 110µ | 2.7 | 36 | $1.39 (LT1996CMS#PBF) |
| 22 | LT1995 | 1 | -15 | 15 | Slightly | 1 | 7 | 32M | 1k | 8.5m | 5 | 30 | $1.89 (LT1995CMS#PBF) |
| 23 | LT1991 | 1 | -18 | 18 | Yes | 1 | 13 | 560k | 120m | 110µ | 2.4 | 40 | $1.39 (LT1991CMS#PBF) |
| 24 | LT1990 | 1 | -250 | 250 | Yes | 1 | 10 | 100k | 550m | 180µ | 2.4 | 36 | $1.35 (LT1990CS8#PBF) |
| 25 | AD628 | 1 | -120 | 120 | Yes | 0.1 | 100 | 600k | 300m | 1.6m | 4.5 | 36 | $2.00 (AD628ARMZ) |
| 26 | AD629 | 1 | -270 | 270 | Yes | 1 | 1 | 500k | 2.1 | 1m | 5 | 36 | $3.19 (AD629ARZ) |
| 27 | AD626 | 1 | -24 | 24 | Yes | 10 | 100 | 100k | 220m | 2m | 2.4 | 10 | $3.77 (AD626ARZ) |
| 28 | AMP03 | 1 | -20 | 20 | Yes | 1 | 1 | 3M | 9.5 | 3.5m | 10 | 36 | $3.10 (AMP03GSZ) |
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