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Analog Devices Inc. LT1997 Wide Voltage Gain Selectable Amplifier

Analog Devices Inc. LT1997 Wide Voltage Gain Selectable Amplifier is a one-chip solution for accurately amplifying voltages. The LT1997 combines a precision operational amplifier with highly-matched resistors. The LT1997 is ideal for use as a difference amplifier, where the excellent resistor matching results in a common mode rejection ratio of greater than 91dB.

Features

  • LT1997-1
    • Up to 80V/V precision gain
    • V– to V– + 76V input common-mode voltage range
    • 109dB minimum CMRR (gain = 10)
    • 0.012% (120ppm) maximum gain error (gain = 10)
    • 1ppm/°C maximum gain error drift
    • 2ppm maximum gain nonlinearity
    • 3.3V to 50V wide supply voltage range
    • Rail-to-rail output
    • 350µA supply current
    • 65µV maximum op amp offset voltage
    • 650kHz –3dB bandwidth (gain = 10)
    • 20µA low power shutdown 
    • Space-saving MSOP and DFN packages

  • LT1997-2
    • Precision attenuation: Gain = 0.1, 0.2, 0.25
    • ±255V common-mode voltage range
    • 105dB minimum CMRR (gain = 0.1)
    • 0.006% (60ppm) maximum gain error
    • 1ppm/°C maximum gain error drift
    • 2ppm maximum gain nonlinearity
    • 3.3V to 50V wide supply voltage range
    • Rail-to-rail output
    • 350µA supply current
    • 80µV maximum op amp offset voltage
    • 1MHz –3dB bandwidth (gain = 0.1)
    • 20µA low power shutdown 
    • Space-saving MSOP and DFN packages
  • LT1997-3
    • Pin configurable as a difference amplifier, inverting amplifier, or noninverting amplifier
    • 91dB minimum DC CMRR (gain = 1)
    • 65dB AC CMRR (at 100kHz, gain = 1)
    • 0.006% (60ppm) maximum gain error (gain = 1)
    • 1ppm/°C maximum gain error drift
    • 2ppm maximum gain nonlinearity
    • ±160V common-mode voltage range
    • 3.3V to 50V wide supply voltage range
    • Rail-to-rail output
    • 350µA supply current
    • 60µV maximum op amp offset voltage
    • 1.1MHz –3dB bandwidth (gain = 1)
    • 20µA low-power shutdown 
    • Space-saving MSOP and DFN packages

Applications

  • High-side or low-side current sensing
  • Bidirectional wide common-mode range current sensing
  • High voltage to low voltage level translation
  • Industrial data-acquisition front-ends
  • Replacement for isolation circuits
  • Differential to single-ended conversion

Typical Application

Analog Devices Inc. LT1997 Wide Voltage Gain Selectable Amplifier

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Published: 2018-12-11 | Updated: 2023-02-14