Simplify sensor conditioning with 8:1 AFE interface

April 21, 2016 //By Graham Prophet
Simplify sensor conditioning with 8:1 AFE interface
XR18910 joins Exar's family of analogue front end (AFE) sensor interfaces, which integrates high channel count and functionality in a 3.5 x 3.5 mm footprint. The XR18910 provides 14-bit signal path linearity and is designed to connect analogue sensors to a microcontroller or FPGA with an embedded ADC.


The onboard 10-bit DAC offers ±560 mV of offset correction and allows an independent offset value for each of the eight differential inputs. The programmable gain instrumentation amplifier offers eight fixed-gain settings (from 2 V/V to 760 V/V), ensuring the amplified sensor signal falls within the optimum input range of the downstream ADC. The integrated LDO provides a regulated 3V or 2.65V voltage to power the sensors. The XR18910 is controlled via an I ²C serial interface and typically consumes 457 µA of supply current with a sleep mode which reduces the supply current to 45 µA. Exar designed it to be an easy-to-use sensor interface that calibrates and amplifies signals from eight different analogue sensors, improving overall system sensitivity and accuracy... it offers more functionality with lower power than discrete solutions and is suitable for a variety of applications such as force sensing, pod racers and power monitoring for solar energy and data centres. It also occupies a significantly smaller footprint than the original XR10910 16:1 sensor interface, making it more attractive when fewer channels are required.”


XR18910 is priced at $6.10 (1000).





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