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ZL49010 Datasheet(PDF) 6 Page - Zarlink Semiconductor Inc

Part # ZL49010
Description  Wide Dynamic Range DTMF Receiver
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Manufacturer  ZARLINK [Zarlink Semiconductor Inc]
Direct Link  http://www.zarlink.com
Logo ZARLINK - Zarlink Semiconductor Inc

ZL49010 Datasheet(HTML) 6 Page - Zarlink Semiconductor Inc

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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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