AS1716 Datasheet PDF | austriamicrosystems AG

austriamicrosystems AG AS1716

AS1716 is an analog front end specifically designed for unbiased Capacitive Sensors, as for instance Knock Sensors in Automotive, to be interfaced with Analog Digital Converters with Sample and Hold input stages. The device provides differential inputs, a 1st order low pass filter to cutoff the high frequency noise components, differential to single ended conversion, programmable gain stage and a 2 pole low pass Multiple Feedback Filter. The Knock Sensor is a Piezo Electric device that generates a voltage if it is stressed.

Part No.	AS1716
Datasheet	AS1716 Download
Manufacturer	austriamicrosystems AG
Description	Capacitive Sensor Interface
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GENERAL DESCRIPTION

It senses knock and transmits information to the electronic engine management control unit. This influences process control in the engine, for example timing and fuel injection until knock is eliminated. The capacitive sensor is biased via resistors to a voltage level of VDDA/2. 2 Key

FEATURES

! ! ! ! Differential input stage with wide input range Resistive sensor biasing (VDDA/2) Programmable Gain (x0.5, x1, x2, x4) Internal 2 order low pass Multiple Feedback Filter with a min. cut off frequency of 16kHz Single supply operation: 4.5V to 5.5V Operating Temperature range: -40°C to +125°C High CMRR: 55dB (min) EMC characterized by IEC 61967-4 (1Ω / 150Ω Method) EMC characterized by IEC 62132-4 (Direct Power Injection) Automotive qualified to AECQ100 for IC and PPAP level 3 8-pin SOIC Package nd ! ! ! ! ! ! ! 3

APPLICATIONS

Analog front end for Capacitive Sensors to Analog to Digital Converters and DSP. Figure 1. AS1716 Block Diagram VDDA VSSA NC INN VDDA + VDDA/2 + VDDA/2 Gain Control x0.5, x1, x2, x4 + VDDA/2 + OUT Multiple Feedback LP Filter fc ~23kHz typ.