CAV424

CAV424 C/V-converter for single and differential capacitive input signals Principle Function Capacitance/Voltage-converter IC with adjustable voltage output and integrated temperature sensor Function CAV424 is an integrated capacitance-to-voltage converter. The IC measures the capacitance of a connected capacitive measurement head against a reference capacitance and converts the difference into a DC output voltage. CAV424 can be used as analog front end for a micro processor or as stand-alone IC. Typical Applications Humidity measurement Distance measurement Suitable for capacitive pressure sensors Level sensing Material identification Object detection Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone:+49 (0)6131/91 0730-0 Fax: +49 (0)6131/91 073-30 Internet: www.analogmicro.de E–Mail: info@analogmicro.de July 2014 – Rev. 3.0 CAV424 C/V-converter for single and differential capacitive input signals Contents FEATURES 3 GENERAL DESCRIPTION 3 BLOCK DIAGRAM 3 SPECIFICATIONS 4 1. Electric Specifications 4 2. Absolute Maximum Values 5 FUNCTIONAL PRINCIPLE 6 FUNCTIONAL DESCRIPTION 7 1. Oscillator 7 2. Measurement and Reference Integrators 7 3. Signal Processing Unit (Low Pass Filter and Output Stage) 8 APPLICATION INFORMATION 9 1. Transfer Function 9 2. CAV424 used as C/V-converter with adjustable gain and offset 10 3. Standard Dimensioning 11 4. Calibration Procedure 11 5. Operation Instructions 12 PACKAGE AND PI...