Zero-drift op-amps enable high-resolution measurement at very low power levels

25-09-2020 | Analog Devices | Semiconductors

The Analog Devices LTC2066/LTC2067/LTC2068 are single, dual, and quad low power, zero-drift, 100kHz amplifiers. The devices enable high-resolution measurement at exceptionally low power levels.

Typical supply current is 7.5μA per amplifier with a maximum of 10μA. The available shutdown mode has been optimised to minimise power consumption in duty-cycled applications and offers low charge loss throughout powerup, decreasing total system power.

The devices’ self-calibrating circuitry results in extremely low input offset (5μV max) and offset drift (0.02μV/C). The maximum input bias current is just 35pA and does not exceed 150pA over the entire specified temperature range. The exceptionally low input bias current of the op-amps enable the usage of high-value power-saving resistors in the feedback network.

With its ultralow quiescent current and outstanding precision, the device can function as a signal chain building block in portable, energy harvesting and wireless sensor applications.

The LTC2066 is offered in six-lead SC70 and five-lead TSOT-23 packages. The LTC2067 is available in eight-lead MSOP and ten-lead DFN packages. The LTC2068 is available in 14-lead TSSOP and 16-lead 3mm x 3mm QFN packages. These devices are fully specified over the –40C to 85C and –40C to 125C temperature ranges.

Typical applications include signal conditioning in wireless mesh networks, portable instrumentation systems, low-power sensor conditioning, gas detection, temperature measurement, medical instrumentation, energy harvesting applications, and low power current sensing.

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