Bridge sensor conditioner for low power applications
28 November 2007
Analogue, Mixed Signal, LSI
Analog Devices' AD8290 bridge sensor conditioner contains both an adjustable current source to drive a sensor bridge and an instrumentation amplifier to amplify the signal voltage. The device is set for a fixed gain of 50. The AD8290 is suitable for both the driving and sensing functions required for pressure, temperature and strain gauge bridges.
The supply voltage range is from 2,6 to 5 V, while excitation current ranges from 300 to 1300 μA, and is settable via an external resistor. Input bias current is a low 100 pA and the device offers a common mode rejection ratio of 120 dB. Thanks to these features, as well as 0,5 μA shutdown current, the AD8290 is also well suited for drive and sense circuits in portable electronics. It is available in a lead-free 3,0 mm x 3,0 mm x 0,55 mm package and is operational over the industrial temperature range of -40°C to +85°C.
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