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TEA7063 Arkusz danych(PDF) 10 Page - STMicroelectronics |
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TEA7063 Arkusz danych(HTML) 10 Page - STMicroelectronics |
10 / 15 page 6. CURRENT SOURCE FOR SPEAKERPHONE 6.1 Current Source (pin 12) Most of the DC current available from the line is delivered by the speech circuit at the output Isource (pin 12) through an internal current generator. Typical values of this current, lLS with R9 = 100K, are: ILS = (0.3 • ILINE) for ILINE < 16.5mA ILS = (0.9 • ILINE -10mA) for ILINE > 16.5mA (ex: ILINE = 16mA then ILS = 5mA ILINE = 30mA then ILS = 17mA ILINE = 60mA then ILS = 44mA). The voltage level at pin 12 must be defined by an external regulator (i.e.: zener) and, if necessary, filtered with a capacitor (47 to 220 µF). In case VLINE (at pin 16) approaches voltage at pin 12, then the internal current source switches off and its DC current is shunt to ground through and internal complementary generator, thus avoiding any negative effect on the AC and DC impedances of the telephone set application. 5. MICROPROCESSOR INTERFACE 5.1 Microprocessor Supply (pin 19) At ”off-hook” the first priority of the circuit is to make some current available at the Microproces- sor Supply (pin 19) to charge quickly the external capacitor C2. This charging current is Icpm = 0.6 • ILINE T-charge of about 10ms is necessary, with C2 = 47/ µF. to charge pin 19 at the specified value of 3.3V typical at ILINE = 25mA: T-charge = 3.3V • C2 0.6 • ILINE typically Vmp = 3.3V in normal operation and current in- creases linearly from 0.5mA min, at ILINE = 6mA, to1.5mA, at ILINE = 25mA, remaining stable for higher values of ILINE. (with R9 = 100K) In general: Imp = 130Volt R9 + 0.3mA at IL > 25mA Imp = 11Volt R9 + 0.3mA at IL > 6mA A zener of 3.9V typical is generally suggested to Figure 8 Figure 9 TEA7063 10/15 |
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