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CF8223A Datasheet(PDF) 9 Page - Nippon Precision Circuits Inc |
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CF8223A Datasheet(HTML) 9 Page - Nippon Precision Circuits Inc |
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9 / 15 page  SM8223A NIPPON PRECISION CIRCUITS—9 FUNCTIONAL DESCRIPTION Ring Signal Detector The telephone tip and ring signals pass through a protection circuit and are input to a resistor, capaci- tor and diode bridge network, shown in figure 1. The diode bridge full-wave rectified output signal (point a) is reduced in level by a resistor voltage divider comprising R1 and R2 (point b), and then input on RDIN. When the ring signal input on RDIN exceeds the Schmitt buffer trigger voltage (0.7VDD), the output switches the open-drain RDRC pin. The signal at RDRC (point c) drives a time-constant cir- cuit comprised by resistor R4 and capacitor C1 con- nected to the input of a second Schmitt buffer to generate the detector signal output on RDET (point d). Thus, RDET goes LOW when the ring or tip sig- nal exceeds the level set by the resistor voltage divider. Figure 1. Ring signal detector circuit RDIN TIP RING R1 C1 R3 R3 C2 C2 RDET RDRC R4 a b d c Db R2 D1 |
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