60V zero-drift op amp features wide dynamic range

27th August 2013
Nat Bowers

Linear Technology has today announced a new zero-drift amplifier featuring self-calibrating circuitry that provides high DC precision and stability over changes in temperature, time, input range and supply voltage. Offering more than 140dB dynamic range while operating on a 60V (±30V) supply, the LTC2057HV features 5µV input offset voltage, 0.025µV/°C offset drift and 220nVP-P low frequency noise with no 1/f noise.

This wide dynamic range enables tiny signals to be amplified in the presence of much larger signals without saturating the amplifier or losing precision. For applications requiring supply voltages up to 36V, a lower supply version of LTC2057 is available.

Specified over a -40°C to 125°C temperature range, the LTC2057 and LTC2057HV offer an optimal combination of low voltage noise, low current noise and low input bias current, while the zero-drift architecture cancels 1/f noise. Spurious artefacts normally associated with zero-drift amplifiers are suppressed, further extending the dynamic range, stability and useful signal bandwidth. The input common-mode range includes the negative rail and the output swings rail-to-rail, making the LTC2057 suitable for single- and dual-supply industrial, instrumentation and automotive applications.

The LTC2057 is specified for 30V supply operation while the LTC2057HV can operate on supplies up to 60V. Both versions also work on 4.75V supplies and are fully specified over -40°C to 85°C and -40°C to 125°C temperature ranges. The LTC2057 is available in 3mm x 3mm DFN, MSOP-8 and SOIC-8 packages, as well as an MSOP-10 package with a pinout that enables a guard ring to be easily routed around the input to preserve the high precision and low noise performance at high source impedance. Pricing starts at $1.54 each for the LTC2057 and $2.19 each for the LTC2057HV in quantities of 1000.

Key features:

  • Supply Voltage Range: 4.75V to 60V,
  • Offset Voltage: 5µV (Maximum),
  • Offset Voltage Drift: 0.025µV/°C (Maximum, –40°C to 125°C),
  • Input Noise Voltage: 220nVP-P, DC to 10Hz (Typ); 13nV/√Hz, 1kHz (Typ),
  • Input Common Mode Range: V– – 0.1V to V+ – 1.5V,
  • Rail-to-Rail Output,
  • AVOL: 150dB (Typ),
  • PSRR: 160dB (Typ),
  • CMRR: 150dB (Typ)on,
  • Shutdown Mode,
  • MS10 Package Includes Guard Ring Pins.

Target applications:

  • High Resolution Data Acquisition,
  • Reference Buffering,
  • Test & Measurement,
  • Electronic Scales,
  • Thermocouple Amplifiers,
  • Strain Gauges,
  • Low-Side Current Sense,
  • Automotive Monitors and Control.

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