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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

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

Product Description

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 excellent gain accuracy and high CMRR. They also have extremely low gain drift vs. temperature.

The common-mode range of the amplifier extends to almost triple the supply voltage (for G = ½), making the amplifer ideal for single-supply applications that require a high common-mode voltage range. The internal resistors and ESD circuitry at the inputs also provide overvoltage protection to the op amp.

The AD8278 and AD8279 can be used as difference amplifiers with G = ½ or G = 2. They can also be connected in a high precision, single-ended configuration for non inverting and inverting gains of −½, −2, +3, +2, +1½, +1, or +½. The AD8278 and AD8279 provide an integrated precision solution that has a smaller size, lower cost, and better performance than a discrete alternative.

The AD8278 and AD8279 operate on single supplies (2.0 V to 36 V) or dual supplies (±2 V to ±18 V). The maximum quiescent supply current is 200 μA, which is ideal for battery-operated and portable systems. For unity-gain difference amplifiers with similar performance, refer to the AD8276 and AD8277 data sheets.

The AD8278 is available in the space-saving 8-lead MSOP and SOIC packages, and the AD8279 is offered in a 14-lead SOIC package. Both are specified for performance over the industrial temperature range of −40°C to +85°C and are fully RoHS compliant.


Applications
  • Voltage measurement and monitoring
  • Current measurement and monitoring
  • Instrumentation amplifier building block
  • Portable, battery-powered equipment
  • Test and measurement

    • RESOURCES & TOOLS

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    • Wide input range beyond supplies
    • Rugged input overvoltage protection
    • Low supply current: 200 μA maximum (per amplifier)
    • Low power dissipation:
      0.5 mW at VS = 2.5 V
    • Bandwidth: 1 MHz (G = ½)
    • CMRR: 80 dB minimum,
      dc to 20 kHz (G = ½, B Grade)
    • Low offset voltage drift: ±1 μV/°C maximum (B Grade)
    • Low gain drift: 1 ppm/°C maximum (B Grade)
    • Enhanced slew rate: 1.4 V/μs
    • Wide power supply range
      Single supply: 2 V to 36 V
      Dual supplies: ±2 V to ±18 V
    • 8-lead SOIC, 14-lead SOIC, and MSOP packages

    Functional Block Diagram for AD8279

    Similar Products

    arrow View Full Interactive Product Selection Table
    Part# # Channels Gain Range (min to max) Slew Rate Bandwidth G=10 (kHz typ) Rail-Rail Out Rail-Rail In CMRR (dB) Vcc-Vee Common Mode Range (V) Gain Error (%) max Gain temp co. Vosi (µV) VosiTC (µV/deg C) Input Vnoise THD+N (f=1kHz 10Vpp) (dB) Supply Current Price* (1000-4999)
    AD628 1 100 0.3V/µs 600 No Yes 75 4.5V to 36V +/- 120 +0.1 5ppm/C 1500 3 300nV/rtHz - 1.6mA $1.78
    AD629 1 1 2.1V/µs 500 No Yes 90 5V to 36V +/- 270 +0.03 10ppm/C 500 3 550nV/rtHz - 1mA $2.84
    AD8270 2 1.2 30V/µs - Yes Yes 76 5V to 36V -Vs-0.4 to +Vs+0.4 +0.05 10ppm/C 1000 2 38nV/rtHz 110 2.5mA $1.91
    AD8271 1 1.2 30V/µs - Yes Yes 80 5V to 36V -Vs-0.4 to +Vs+0.4 +0.02 2ppm/C 600 2 38nV/rtHz 110 2.6mA $1.25
    AD8273 2 2 20V/µs - No Yes 77 5V to 36V 3(-Vs)+4.5 to 3(Vs)-4.5 +0.03 2ppm/C 700 3 26nV/rtHz 112 2.5mA $1.67
    AD8274 1 2 20V/µs 10000 No Yes 77 5V to 36V 3(-Vs)+4.5 to 3(Vs)-4.5 +0.03 2ppm/C 700 3 26nV/rtHz 112 2.6mA $1.05
    AD8275 1 0.2 25V/µs - Yes Yes 86 3.3V to 15V +/-12 +0.024 1ppm/C 500 2.5 40nV/rtHz 106 2.3mA $1.60
    AD8277 2 1 1.1V/µs - Yes Yes 86 2V to 36V 2(-Vs)-0.2 to 2(Vs)-3 +0.02 1ppm/C 200 0.5 65nV/rtHz - 0.4mA $1.60
    AD8278 1 2 1.4V/µs - Yes Yes 80 2V to 36V 3(-Vs)-0.3 to 3(Vs)-4.5 +0.02 1ppm/C 100 0.3 47nV/rtHz - 0.2mA $0.95
    AMP03 1 1 9.5V/µs - No Yes 85 12V to 36V +/- 20 +0.008 - 400 - 90nV/rtHz - 2.5mA $2.81
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    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.