Digital temperature sensors

4 August 2010 Analogue, Mixed Signal, LSI

Analog Devices has introduced two fully calibrated, 16-bit-resolution, high-linearity digital temperature sensors. The low-drift ADT7420 and ADT7320 achieve ±0,25°C accuracy over a –20°C to +105°C temperature range and ±0,5°C accuracy over the –40°C to +125°C range. They also provide highly accurate system reference temperature measurement to reduce errors in software-based, thermocouple cold-junction compensation applications and infrared imaging systems. The sensors are guaranteed to operate over supply voltages from 2,7 V to 5,5 V with an operating temperature range of -40°C to +150°C. Operating at 3,3 V, the supply current is 210 μA. The devices include a low-power one-sample-per-second mode that draws only 46 μA at 3,3 V and also offer a shutdown mode that reduces supply current to just 2 μA.

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