PWM Outputs Enhance Sensor Signal Conditioners

Abstract: This application note explains that piezoresistive sensors have nonlinear error over temperature. This error can be reduced to within 1% of the sensor's inherent repeatability limitations by using a Maxim sensor signal conditioner and transmitter to transmit sensor information. One transmission method modulates the ratiometric output using pulse-width modulation (PWM). Like its current-loop counterpart, the PWM output has good noise immunity and is suitable for transmission over longer distances. The MAX1452 sensor signal conditioner is featured.