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element provides a mechanical low-pass filter that cuts off above 115 Hz and provide a good stable amplitude output and noise filtering. By using an analog output, the SCA720 can be placed a good distance away from the controlling unit without any interference to the sensors output. The sensor is earth gravity compensated with a +1 g offset where Vout is +2.5 VDC. Measurement range is 2.11g in both directions, providing a Vout in the range from 0 to +5 VDC. Murata www.murata.com MEMS accelerometer targets engine anti-vibration and suspension applications Component manufacturer Murata announced the SCA720 series of analog MEMS accelerometers aimed specifically at electrically controlled suspension and engine anti-vibration applications in cars. Measuring only 7.0x8.6x3.3mm and constructed from a single crystal silicon, the sensor is mechanically robust and has no deformation at shocks with up to 70.000g. The accelerometer’s 3D structure employs capacitive sensing techniques that give it extremely sensitive measurement characteristics and excellent offset stability. Internal inert gas damping of the MEMS sensing Software solution eliminates engine noise What HiFi lovers know from their headphones will soon be available in car interiors: A silent environment with no noise from engine and gearbox, allowing drivers and passengers to enjoy their music while on the road. The reason: QNX has developed a software that eliminates undesired noise. With its noise cancelling approach, QNX addresses OEMs and suppliers, not end customers. QNX Acoustics for Active Noise Control is a purely software-based solution that runs on the car radio - that is, if this radio is implemented as a Software Defined Radio (SDR) and has an appropriate processor or DSP inside. As sensors and actuators, the system utilizes loudspeakers and hands-free microphones that are available in the car anyway. Since no additional hardware is required, manufacturers can implement this solution at significantly lower cost than hardware-based systems. QNX also claims that the results of their Acoustic for Active Noise Control are significantly better than with known Active Noise Control solutions.The software becomes particularly relevant against the background of the recent measures from carmakers to increase engine efficiency and reduce fuel consumption with smaller engine designs (with new noise issues). QNX www.qnx.com Temperature Variable Attenuators TVAs from the recognized leader in high reliability resistive components offer: • Case size 0.150” x 0.125” x 0.018” • Choice of three temperature coefficient of attenuation (TCA) values: -0.003, -0.007, -0.009 • Attenuation values from 1-10 dB • Planar design with solderable or wire bondable terminations • Lower signal distortion, phase change and intermodulation compared with active circuit temperature compensation When the mission is critical, choose State of the Art. State of the Art, Inc. ResisTive PRoduCTs Made in the USA. 30 Electronic Engineering Times Europe November 2013 www.electronics-eetimes.com


EETE NOV 2013
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