Tiny 50MHz CMOS Op Amp Boasts Low Noise and High Precision

Aug 17 2006 - MILPITAS, CA
  • Linear Technology Corporation announces the latest addition to its family of low noise, precision CMOS op amps. With a gain bandwidth of 50MHz and input characteristics that challenge precision bipolar amplifiers, the LTC6244 dual op amp offers breakthrough performance that no other amplifier can deliver. Guaranteed offset voltage of only 300uV max over the full industrial temperature range rivals the 25°C spec for other amplifiers in its class.

    Using a unique architecture, the LTC6244 boasts low noise of 8nV/√Hz while maintaining an input capacitance of only 2.1 pF. Very low input capacitance is critical at high frequencies to maintain high input impedance and low noise performance.

    "This breakthrough performance, previously unattainable from a CMOS amplifier, delivers maximum signal resolution in a variety of applications such as large or small area photodiode, transimpedance and charge coupled amplifiers, precision integrators and filters," says design manager, Dan Tran. The LTC6244 has applications in instrumentation, medical, industrial and communications systems.

    In addition to minimizing the voltage gain error, the LTC6244 provides excellent DC precision. It features 1pA bias current and less than 100uV input offset voltage at 25°C. Offset voltage drift is guaranteed under 2.5uV/°C while the high voltage gain of 120dB keeps system error to a minimum. The 50MHz gain bandwidth and 40V/us slew rate at a low supply current of 7.4mA max per amplifier makes this amplifier extremely versatile and perfect for use in a wide variety of applications.

    Operating from supply voltages as low as 2.8V and up to 12V (HV version), the amplifier's output swings rail-to-rail. The LTC6244 dual op amp is offered in tiny 3mm × 3mm DFN and 8-pin MSOP packages. Fully specified to operate over the commercial, industrial, and high temperature ranges, 1,000-piece pricing starts at $1.65 each.

    Summary of Features: LTC6244

    • Low Noise:
      • en (1kHz): 8nV/√Hz typ
      • in (1kHz): 0.56 fA/√Hz typ
    • Low Bias Current: 1pA typ
    • Low Offset Voltage: 100uV Max @ 25°C, 300uV Max Over Temp
    • Low Offset Voltage Drift: 2.5uV/°C Max
    • Low Input Capacitance: 2.1pF Common Mode, 3.5pF Differential
    • Gain Bandwidth Product: 50MHz typ
    • Slew Rate: 40V/us typ
    • Rail-to-Rail Outputs
    • Supply Current: 7.4 mA/amplifier
    • Supply Range:
      • 2.8V to 6V (LTC6244)
      • 2.8V to 12V (LTC6244HV)

    50MHz Low Noise CMOS Op Amp Offers Exceptional Precision

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