AD8691:  Single, Low Cost, Low Noise, CMOS Rail-to-Rail Output Operational Amplifier

The AD8691, AD8692, and AD8694 are low cost, single, dual, and quad rail-to-rail output, single-supply amplifiers featuring low offset and input voltages, low current noise, and wide signal ...More

AD8691:  Single, Low Cost, Low Noise, CMOS Rail-to-Rail Output Operational Amplifier

Product Description

The AD8691, AD8692, and AD8694 are low cost, single, dual, and quad rail-to-rail output, single-supply amplifiers featuring low offset and input voltages, low current noise, and wide signal bandwidth. The combination of low offset, low noise, very low input bias currents, and high speed make these amplifiers useful in a wide variety of applications. Filters, integrators, photodiode amplifiers, and high impedance sensors all benefit from this combination of performance features. Audio and other ac applications benefit from the wide bandwidth and low distortion of these devices.

Applications for these amplifiers include power amplifier (PA) controls, laser diode control loops, portable and loop-powered instrumentation, audio amplification for portable devices, and ASIC input and output amplifiers.

The small SC70 and TSOT package options for the AD8691 allow it to be placed next to sensors, thereby reducing external noise pickup.

The AD8691, AD8692, and AD8694 are specified over the extended industrial temperature range of −40°C to +125°C. The AD8691 single is available in 5-lead SC70 and 5-lead TSOT packages. The AD8692 dual is available in 8-lead MSOP and narrow SOIC surface-mount packages. The AD8694 quad is available in 14-lead TSSOP and narrow 14-lead SOIC packages.

Applications

  • Photodiode amplification
  • Battery-powered instrumentation
  • Medical instruments
  • Multipole filters
  • Sensors
  • Portable audio devices

    • Data Sheet, Rev. C, 5/07

    Features

    • Offset voltage: 400 μV typical
    • Low offset voltage drift: 6 μV/°C maximum (AD8692/AD8694)
    • Very low input bias currents: 1 pA maximum
    • Low noise: 8 nV/√Hz
    • Low distortion: 0.0006%
    • Wide bandwidth: 10 MHz
    • Unity-gain stable
    • Single-supply operation: 2.7 V to 6 V

    Diagrams

    AD8691 Diagram
    Pin Configuration Diagram for AD8691

    Specifications

    -3dB Bandwidth 10MHz
    Slew Rate 5V/µs
    Vos 400µV
    Ib 0.2pA
    Input Noise (nV/rtHz) 6.5nV/rtHz
    Vcc-Vee Supply (V) 2.7 to 6
    Iq per Amplifier (max) 1.05mA
    # OpAmps per Pkg 1
    Operating Temp Range -40 to +125
    Packages SC70,SOT

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    Part# Small Signal Bandwidth Slew Rate Vos Ib V Noise Density Amplifiers Per Package Widest Temp Range (°C)
    AD8605 10MHz 5V/µs 20µV 200fA 6.5nV/rtHz 1 -40 to +125
    AD8691 10MHz 5V/µs 400µV 200fA 6.5nV/rtHz 1 -40 to +125
    AD8606 10MHz 5V/µs 20µV 200fA 6.5nV/rtHz 2 -40 to +125
    AD8615 23MHz 12V/µs 80µV 200fA 7nV/rtHz 1 -40 to +125
    AD8616 24MHz 12V/µs 23µV 200fA 6nV/rtHz 2 -40 to +125
    AD8610 25MHz 60V/µs 75µV 2pA 6nV/rtHz 1 -40 to +125
    AD8655 28MHz 11V/µs 50µV 10pA 4nV/rtHz 1 -40 to +125
    AD8651 50MHz 41V/µs 100µV