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CAV424 Datasheet(PDF) 5 Page - Analog Devices |
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CAV424 Datasheet(HTML) 5 Page - Analog Devices |
5 / 16 page CAV424 - C/U transducer IC with adjustable output voltage Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz July 2007 - Rev 1.2 - Page 5/16 Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: info@analogmicro.de If capacitors CM and CR are the same, following rectification and filtering (see Figure 5) a DC- voltage signal is generated with a value of 0. Should CM change (measurement capacitor), a DC- voltage signal is produced which is proportional to !CM . If CM and CR are not the same, when !CM = 0 an offset would be generated at the output which is superimposed onto the actual direct voltage signal. Oscillator function The integrated oscillator charges up and then discharges the external oscillator capacitor COSC (see Figure 3). The oscillator current IOSC is determined by external resistor ROSC and reference voltage VM: I V R OSC M OSC " (1) The oscillator frequency fOSC is calculated as: OSC OSC OSC OSC C V I f # $ # " 2 (2) (2) where $VOSC is the difference between the thresholds of the internal oscillator ( VOSC,HIGH and VOSC,LOW). $VOSC is defined via internal resistors in the IC and has a value of 2.1V @ VCC = 5V (see Figure 3). The oscillator frequency can thus be specified by the choice of ROSC and COSC; the relevant maximum and minimum values are given in Table 1. Capacitive integrators The built-in capacitive integrators function works in the same way as the oscillator. One difference lies in the discharge time, which here is half the length of the charge-up period. Furthermore, the minimum oscillator voltage for the integrators is internally clamped to a value of VCLAMP = 1.2 V (see Figure 4). V OSC,HIGH time t V OSC,LOW V OSC T 2T T 2 V OSC Figure 3: Oscillator voltage curve |
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