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ADI Analog Devices Zero-Drift Amplifiers | New Product Brief

August 15, 2019 by Mouser Electronics

This New Product Brief (NPB) is part of a video series highlighting the features, applications, and technical specs of newly-released products.

ADI Analog Devices Zero-Drift Amplifiers

Analog Devices' ADA4051-1 and ADA4051-2 operational amplifiers are ideal for applications requiring high precision and low power consumption.

The amplifiers operate from a single 1.8 volt to 5.5 volt supply and have a typical current consumption of 13 microamps, making them useful for battery-powered devices. They have very low input offset and drift and use a unique chopping architecture that nulls initial offset in the dc domain to prevent ripple at the overall output.

This architecture also results in very low voltage noise, voltage noise density, and current noise density. The op-amps precision performance is also enabled by high common-mode and power supply rejection ratios.

The single-channel ADA4051-1 is available in SOT-23 and SC-70 packages, while the dual-channel ADA4051-2 is offered in MSOP and LFCSP packages.

  • Single-supply operation: 1.8V to 5.5V
    • Very low-supply current: 13μA typical
  • Low-offset voltage: 15μV maximum
    • Offset voltage drift: 20 nV/°C 
  • Noise performance:
    • Voltage noise: 1.96µV p-p
    • Voltage noise density: 95nV/√Hz
    • Current noise density: 100fA/√Hz
  • High PSRR and CMRR: 110dB minimum
  • Package options:
    • ADA4051-1: SOT-23, SC-70
    • ADA4051-2: MSOP, LFCSP

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1 Comment
  • K
    kendallcp September 13, 2019

    These fine chopper amplifiers aren’t exactly new, the first datasheet dates from 10 years ago.  And be cautious about the claim of low current noise.  Like similar products from other vendors, the chopping at the input causes a higher bias current than non-chopped precision amplifiers, and a noise current density around 15x higher than you might otherwise expect.  Femtoamps sound small but 100fA/rtHz is not insignificant when working at high impedances.

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