Features and Benefits

  • Precision Gain: Up to 80V/V
  • Input Common Mode Voltage Range: V to V + 76V
  • 109dB Minimum CMRR (Gain = 10)
  • 0.012% (120ppm) Maximum Gain Error (Gain = 10)
  • 1ppm/°C Maximum Gain Error Drift
  • 2ppm Maximum Gain Nonlinearity
  • Wide Supply Voltage Range: 3.3V to 50V
  • Rail-to-Rail Output
  • 350µA Supply Current
  • 65µV Maximum Op Amp Offset Voltage
  • 650kHz –3dB Bandwidth (Gain = 10)
  • Low Power Shutdown: 20µA
  • Space-Saving MSOP and DFN Packages

Product Details

The LT1997-1 is a difference amplifier that can be used to amplify small differential signals while rejecting large common mode signals making it an ideal choice for current sense applications. It combines a precision operational amplifier with highly-matched resistors to form a one-chip solution to amplify and level shift voltages accurately using no external components. It comes with three standard pin-selectable gain options (10, 20 and 50), which can be further combined to form gains from 0.141 to 80 with accuracy of 0.012% (120ppm). The LT1997-1 also operates with input voltages between V and V + 76V (independent of V+), enabling robust operation in demanding industrial environments. Its excellent resistor matching results in a common mode rejection ratio of greater than 109dB (Gain = 10).

The resistors maintain their excellent matching over temperature; the matching temperature coefficient is guaranteed less than 1ppm/°C. The resistors are extremely linear with voltage, resulting in a gain nonlinearity of less than 2ppm.

The LT1997-1 is fully specified at 5V and ±15V supplies and from –40°C to 125°C. The device is available in space saving 16-lead MSOP and 4mm × 4mm DFN14 packages.

  • 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

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Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

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Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.