Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC2063 zero-drift op amp which draws just 1.3 μA typ (2 μA max) on a 1.8 V supply. This micropower amplifier maintains uncompromised precision: maximum input offset voltage is 5 μV at 25 °C, maximum drift is 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.
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| Duty Cycle Lowers System Power. |
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 ultralow 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.
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| Micropower Precision Oxygen Sensor. |
An example is the DC2369A wireless current sense reference board which uses the LTC2063 and LTP™5901-IPM SmartMesh IP™ module and other micropower components to create an isolated floating current sense measurement platform which operates for years on small batteries.
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| LTP5901-IPA – SmartMesh IP Access Point (AP) Mote. |
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.
Summary of Features: LTC2063
- Low Supply Current: 2 μA Maximum
- Offset Voltage: 5 μV Maximum
- Offset Voltage Drift: 0.02 μV/°C Maximum
- Input Bias Current:
- 3 pA Typical
- 30 pA Maximum –40 °C to 85 °C
- 100 pA Maximum –40 °C to 125 °C
- Integrated EMI Filter (114 dB Rejection at 1.8 GHz)
- Shutdown Current:
- 90 nA Typical
- 170 nA Maximum
- Rail-to-Rail Input and Output
- 1.7 V to 5.25 V Operating Supply Range
- AVOL: 140 dB Typical
- Low Charge Power-Up for Duty Cycled Applications
- Specified Temperature Ranges:
- –40 °C to 85 °C
- –40 °C to 125 °C
- 6-Lead SC70, 5-Lead TSOT-23 Packages
