Two 16-bit-resolution, high-linearity, low-drift, fully calibrated, high-precision ADT7320 and ADT7420 digital temperature sensors have been recently introduced by Analog Devices, a world leader in high performing semiconductors used for signal processing applications. These sensors offer the highest precision level in the industry over a broad operating temperature range.
These sensors provide an accuracy of ±0.25˚C over a temperature range of –20˚C to +105˚C, the best in the industry. For the temperature range of –40°C to +125°C, these sensors are able to achieve industry best ±0.5ºC accuracy. The increased accuracy obviates the requirement for averaging the results and thereby ensures enhanced energy efficiency, better reliability, faster measurement of data, and higher-precision control loops in medical, industrial, and instrumentation applications. These sensors also deliver precise reference temperature measurement for reducing errors in software-enabled applications of the thermocouple cold-junction compensation and infrared imaging systems.
These sensors have been guaranteed to function with 2.7 V to 5.5 V supply voltages and –40°C to +150˚C operating temperature range. Its supply current is 210 μA at an operating voltage of 3.3 V.
The sensors incorporate a one-sample-per-second low power mode. This mode draws a mere 46 μA at 3.3 V. In the shut down mode, the supply current is only 2 μA. The sensor has programmable options like critical-temperature and over/under-temperature indicators.
The ADT7320 and ADT7420 sensors can be readily plugged-in and do not need extra calibration and signal conditioning. These sensors are provided with the SPI (ADT7320) I²C (ADT7420) digital interfaces. These interfaces permit system designers to integrate the devices easily into pharmaceutical temperature, environmental control systems, data acquisition, optical communications, and medical equipment monitors.
These sensors are currently undergoing sampling tests. They can also complement various Analog Devices components, like the ADuC7061 precision, low power analog microcontroller.