Power

Zero-drift op amp consumes 1.3μA on a 1.8V supply

12th July 2017
Alice Matthews

 

Drawing just 1.3µA typ (2µA max) on a 1.8V supply, Analog Devices, which recently acquired Linear Technology, has announced the LTC2063 zero-drift op amp. This micropower amplifier maintains uncompromised precision: maximum input offset voltage is 5µV at 25°C, maximum drift is 0.06µV/°C from –40 to 125°C. Maximum input bias current is 15pA at 25°C, and 100pA from -40°C to 125°C.

These high precision input characteristics allow the use of large value feedback network resistors, keeping power consumption low without compromising accuracy, even at elevated temperature.

Rail-to-rail inputs and outputs simplify single supply use and enhance dynamic range. An integrated EMI filter provides 114dB electromagnetic interference rejection at 1.8GHz. With low 1/f noise inherent to its zero-drift architecture the LTC2063 is well suited for amplifying and conditioning low frequency sensor signals in high temperature industrial and automotive systems as well as portable and wireless sensor network applications.

The LTC2063 is available in SOT-23 and SC70 packages. The SC70 version includes a shutdown mode which reduces current consumption to just 90nA when the amplifier is not in use. This enables ultralow power duty cycled sensor applications. For example, a precision low duty cycle oxygen sensor circuit shown in the data sheet consumes less than 200nA average current.

“The LTC2063 enables a whole new class of precision measurement solutions which can be placed anywhere,” stated Ross Yu, Dust Networks Marketing Manager. “Its ultralow power and high precision are a perfect companion for Dust Networks’ SmartMesh wireless sensor networks, expanding the reach of precision measurements to places previously not practical.”

An example is the DC2369A wireless current sense reference board which uses the LTC2063 and LTP5901-IPM SmartMesh IP module and other micropower components to create an isolated floating current sense measurement platform which operates for years on small batteries.

The LTC2063 operates on supply voltages from 1.7-5.25V and is fully specified from –40 to 125°C.

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