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ZL49010 Datasheet(PDF) 6 Page - Zarlink Semiconductor Inc |
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ZL49010 Datasheet(HTML) 6 Page - Zarlink Semiconductor Inc |
6 / 14 page ZL49010/1, ZL49020/1, ZL49030/1 Data Sheet 6 Zarlink Semiconductor Inc. Applications The circuit shown in Figure 3 illustrates the use of a ZL4902x in a typical receiver application. It requires only a coupling capacitor (C1) and a crystal or ceramic resonator (X1) to complete the circuit. The ZL490x0 is designed for user who wishes to tailor the guard time for specific applications. When a DTMF signal is present, the ESt pin will go high. An external microcontroller monitors ESt in real time for a period of time set by the user. A guard time algorithm must be implemented such that DTMF signals not meeting the timing requirements are rejected. The ZL490x1 uses an internal counter to provide a preset DTMF validation period. It requires no external components. The DStD output high indicates that a valid DTMF digit has been detected. Figure 3 - Application Circuit for ZL4902x DTMF/CP Input C1 X1 1 2 3 4 8 7 6 5 INPUT OSC2 OSC1 VSS VDD ESt/DStD ACK SD VDD COMPONENTS LIST: C1 = 0.1 µF ± 10 % X1 = Crystal or Resonator (3.579MHz) To microprocessor or microcontroller ZL4902x |
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