AD8643:  Low Power, Rail-to-Rail Output, Precision JFET Quad Amplifier

The AD8641/AD8642/AD8643 are low power, precision JFET input amplifier featuring low input bias current and rail-to-rail output. The AD8641 family provides high source impedance, low bias current ...More

AD8643:  Low Power, Rail-to-Rail Output, Precision JFET Quad Amplifier

Product Description

The AD8641/AD8642/AD8643 are low power, precision JFET input amplifier featuring low input bias current and rail-to-rail output. The AD8641 family provides high source impedance, low bias current and low supply current which are key to applications such as ECG/EKG monitors, sleep monitoring, and blood analyzing instruments. The ability to swing rail-to-rail at the output enables designers to buffer wide output swing devices in single supply systems.

The AD8641 family is also ideal for applications utilizing multi-channel boards that require low power to manage heat. Other applications include photodiodes, ATE reference level drivers, battery management, and industrial controls.

The AD8641 family is fully specified over the extended industrial temperature range of –40° to +125°C. The AD8641 is available in 5-lead SC70 and 8-lead SOIC packages. The AD8642 is available in 8-lead MSOP and 8-lead SOIC packages. The AD8643 is available in 16-lead 3mm x 3mm LFCSP and 14-lead SOIC packages.


Applications
  • Medical Instrumentation
  • Photodiode Amplifiers
  • Precision Current Sensing
  • Battery-powered Instruments
  • Precision Filters

    • Features

    • Low Supply Current/Amp: 250 µA max
    • Very Low Input Bias Current: 1 pA max
    • Low Offset Voltage: 750 µV max
    • Single-supply Operation: 5 V to 26 V
    • Dual-supply Operation: ±2.5 V to ±13 V
    • Rail-to-rail Output
    • Unity Gain Stable
    • 3mm x 3mm LFCSP and SOIC

    Diagrams

    AD8643 Diagram
    Pin Configuration Diagram for AD8643

    Specifications

    -3dB Bandwidth 3.5MHz
    Slew Rate 3V/µs
    Vos 50µV
    Ib 0.25pA
    Input Noise (nV/rtHz) 27.5nV/rtHz
    Vcc-Vee Supply (V) 5 to 26
    Iq per Amplifier (max) 290µA
    # OpAmps per Pkg 4
    Operating Temp Range -40 to +125
    Packages CSP,SOIC

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    Part# Small Signal Bandwidth Slew Rate Vos Ib V Noise Density Amplifiers Per Package Widest Temp Range (°C)
    AD8643 3.5MHz 3V/µs 50µV 250fA 27.5nV/rtHz 4 -40 to +125
    AD8608 10MHz 5V/µs 20µV 200fA 6.5nV/rtHz 4 -40 to +125
    AD8618 24MHz 12V/µs 23µV 200fA 6nV/rtHz 4 -40 to +125
    AD8664 4MHz 3.5V/µs 50µV 300fA 12nV/rtHz 4 -40 to +125
    AD8674 10MHz 4V/µs 20µV 3nA 2.8nV/rtHz 4 -40 to +125
    AD8668 4MHz 3.5V/µs 600µV 200fA 10nV/rtHz 4 -40 to +125
    OP462 15MHz 13V/µs 25µV 260nA 9.5nV/rtHz 4 -40 to +125
    AD8694 10MHz 5V/µs 400µV 200fA 8nV/rtHz 4