Analog Devices, which recently acquired Linear Technology Corporation, announced the LTC2063 zero-drift op amp which draws just 1.3 μA typ (2 μA max) on a 1.8V supply. This micropower amplifier has a maximum input offset voltage of 5 μV at 25°C, and a maximum drift of 0.06 μV/°C from –40°C to 125°C. Maximum input bias current is 15 pA at 25°C, and 100 pA 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 114 dB electromagnetic interference rejection at 1.8 GHz. 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 90 nA when the amplifier is not in use. This enables ultra-low power duty cycled sensor applications. For example, a precision low duty cycle oxygen sensor circuit shown in the data sheet consumes less than 200 nA 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 V to 5.25 V and is fully specified from –40°C to 125°C. Pricing starts at $1.50 each in 1,000-piece quantities.