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Moteur de recherche de fiches techniques de composants électroniques |
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AS1716 Fiches technique(PDF) 1 Page - ams AG |
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AS1716 Fiches technique(HTML) 1 Page - ams AG |
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1 / 12 page  AS1716 Capacitive Sensor Interface Datash eet www.austriamicrosystems.com Revision 1.00 1 - 12 1 General Description AS1716 is an analog front end specifically designed for unbiased Capacitive Sensors, as for instance Knock Sensors in Automotive, to be interfaced with Analog Dig- ital Converters with Sample and Hold input stages. The device provides differential inputs, a 1st order low pass filter to cutoff the high frequency noise compo- nents, differential to single ended conversion, program- mable gain stage and a 2 pole low pass Multiple Feedback Filter. The Knock Sensor is a Piezo Electric device that gener- ates a voltage if it is stressed. It senses knock and trans- mits 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. Figure 1. AS1716 Block Diagram 2 Key Features ! Differential input stage with wide input range ! Resistive sensor biasing (VDDA/2) ! Programmable Gain (x0.5, x1, x2, x4) ! Internal 2 nd 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 (1 Ω / 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 3 Applications Analog front end for Capacitive Sensors to Analog to Digital Converters and DSP. + - - + - + VDDA VDDA/2 Multiple Feedback LP Filter fc ~23kHz typ. INP GA GB OUT NC VSSA VDDA Gain Control x0.5, x1, x2, x4 - + VDDA/2 VDDA/2 VDDA/2 - + VDDA/2 INN AS1716 |
Numéro de pièce similaire - AS1716 |
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Description similaire - AS1716 |
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