Zero-drift op amp boasts low power consumption without compromise
Analog Devices, which acquired Linear Technology in March this year, has developed the LTC2063 zero-drift op amp which draws just 1.3-microA typical (2.0-micro A maximum) on a 1.8V supply.
The LTC2063 micropower amplifier maintains uncompromised precision, says Analog Devices. It delivers maximum input offset voltage of 5.0-microV at 25 degree C, maximum drift is 0.06-microV/ degree C from –40 to +125 degree C. Maximum input bias current is 15pA at 25 degree C, and 100pA from –40 to +125 degree C. These high precision input characteristics allow the use of large value feedback network resistors, says Analog Devices, this keeps 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 electo magnetic interference (EMI) filter provides 114dB EMI rejection at 1.8GHz. The zero drift architecture inherently has low 1/f noise, making the LTC2063 is well suited for amplifying and conditioning low frequency sensor signals in high temperature industrial and automotive systems. It can also be used in 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 is a particular benefit for low power duty cycled sensor applications, for example, a precision low duty cycle oxygen sensor circuit consumes less than 200nA average current.
The LTC2063’s low power and high precision can be paired with Dust Networks’ SmartMesh wireless sensor networks to expand the reach of precision measurements. For example, the DC2369A wireless current sense reference board which uses the LTC2063 and LTP5901-IPM SmartMesh IP module with other micropower components, creates an isolated floating current sense measurement platform which operates for years on small batteries.
The LTC2063 operates on supply voltages from 1.7 to 5.25V and is fully specified for operation in temperature from –40 to +125 degree C.
