AMS rolls interface chip for knock sensors

Piezo sensors do not require external power supply; they are compact and offer excellent linearity. For this reasons, this type of sensor has been established motor management systems as state-of-the-art approach, explains AMS marketing director Bruce Ulrich.

In order to facilitate interfacing piezo sensors, the company has developed the AS1716. The device offers differential inputs, a first order low pass filter to eliminate the RF noise components, differential to single-ended conversion, programmable gain storage and a two pole low pass multiple feedback filter. It is an analog front end particularly designed for unbiased capacitive sensors, interfacing with sample-and-hold input stages and analog-to-digital converters.

The AS1716 has been EMC characterized by IEC 61967-4 and IEC 62132-4. In addition, it is qualified for automotive use according to AECQ100 and PPAP level 3.

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