Date: 08/06/2010

Digital temp sensors from ADI achieves ±0.25degC accuracy over wide temp range

Analog Devices has unveiled ADT7420 and ADT7320, two fully calibrated, 16-bit-resolution, high-linearity Digital Temperature Sensors (DTS), which ADI claims achieves the industry's highest level of precision over a wide operating temperature range. It can achieve ±0.25degC accuracy over a -20°C to +105°C temperature range and ±0.5ºC accuracy over the -40°C to +125°C temperature range. It is suggested for industrial, instrumentation, and medical applications. These DTSs can also provide accurate system reference temperature measurement to reduce errors in software-based, thermocouple cold-junction compensation applications and infrared imaging systems. These sensors are plug-in ready and are also equipped with I²C (ADT7420) or SPI (ADT7320) digital interfaces.

These new DTSs can operate over supply voltages from 2.7 V to 5.5 V. Typically these sensors operate at 3.3V and have a supply current of 210 µA. These divices also work in a low-power one-sample-per-second mode that draws only 46 µA (typical) at 3.3 V and also offer a shutdown mode that reduces supply current to just 2 µA. Other programmable options include over/under-temperature and critical-temperature indicators.

Operating temperature range: -40°C to +150°C

Price and complementary parts:

Product Sampling Accuracy/Interface Price Each
Per 1,000 Packaging
ADT7320 NOW ±0.25°C SPI $2.35 16-lead LFCSP
(lead frame chip scale package)
ADT7420 NOW ±0.25°C I²C $2.35 16-lead LFCSP


Availability: Now

For more information visit: http://www.analog.com/pr/ADT7320