New High Accuracy Digital Temperature Sensors from Analog Devices

Analog Devices, Inc. has unveiled two digital temperature sensors that are fully calibrated and offer high-linearity to accomplish accurate measurement over a wide range of operating temperatures. The level of precision offered by these sensors is currently the highest in the industry.

These ADT7320 and low-drift ADT7420 sensors feature 16-bit-resolution and provide an accuracy of ±0.25 °C for a temperature range of –20 °C to +105 °C. Over a temperature range of –40 °C to +125 °C temperature range, these sensors offer ±0.5 ºC accuracy.
These sensors ensure higher-precision control loops and quick data measurement. Enhanced accuracy eliminates the need for averaging results and guarantees improved reliability and energy efficiency in instrumentation, medical, and industrial applications.

The precise system reference temperature measurement offered by these sensors reduces errors related to software-dependant infrared imaging systems and thermocouple cold-junction compensation applications. There is a video available to further details.
The ADT7320 and ADT7420 temperature sensors do not require additional calibration or signal conditioning, as they are available ready for integration. This makes them unique when compared to their contemporary alternatives.

Available with SPI (ADT7320) or I²C (ADT7420) digital interfaces, these sensors facilitate easy integration into optical communications, data acquisition, medical equipment environmental control systems, or temperature monitors for pharmaceuticals and food. With an operating temperature range between –40 °C and +150 °C, these sensors offer guaranteed operation in voltages ranging from 2.7 V to 5.5 V.

Typically, the supply current, when operated at 3.3 V, is 210 A. These new sensors feature a mode that is low-powered and offers one-sample-per-second, which extracts only 46 A (typical) power at 3.3 V. Also integrated is a shutdown mode that allows for energy supply as low as 2 A. These new sensors are also available with additional programmable options such as critical-temperature and over/under-temperature indicators.

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