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ZL49031 Datasheet

  • ZL49031

  • Wide Dynamic Range DTMF Receiver

  • 356.52KB

  • 14页

  • ZARLINK   ZARLINK

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ZL49010/1, ZL49020/1, ZL49030/1
Wide Dynamic Range DTMF Receiver
Data Sheet
Features
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Wide dynamic range (50dB) DTMF Receiver
Call progress (CP) detection via cadence
indication
4-bit synchronous serial data output
Software controlled guard time for ZL490x0
Internal guard time circuitry for ZL490x1
Powerdown option (ZL4901x & ZL4903x)
3.579MHz crystal or ceramic resonator (ZL4903x
and ZL4902x)
External clock input (ZL4901x)
Guarantees non-detection of spurious tones
Ordering Information
ZL49010DAA
ZL49011DAA
ZL49020DAA
ZL49021DAA
ZL49030DCA
ZL49030DCB
ZL49030DDA
ZL49030DDB
ZL49031DCA
ZL49031DCB
ZL49031DDA
ZL49031DDB
8 Pin PDIP
8 Pin PDIP
8 Pin PDIP
8 Pin PDIP
18 Pin SOIC
18 Pin SOIC
20 Pin SSOP
20 Pin SSOP
18 Pin SOIC
18 Pin SOIC
20 Pin SSOP
20 Pin SSOP
Tubes
Tubes
Tubes
Tubes
Tubes
Tape &
Tubes
Tape &
Tubes
Tape &
Tubes
Tape &
September 2003
Reel
Reel
Reel
Reel
Applications
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Integrated telephone answering machine
End-to-end signalling
Fax Machines
-40掳C to +85掳C
signal and requires external software guard time to
validate the DTMF digit. The ZL490x1, with preset
internal guard times, uses a delay steering (DStD)
logic output to indicate the detection of a valid DTMF
digit. The 4-bit DTMF binary digit can be clocked out
synchronously at the serial data (SD) output. The SD
pin is multiplexed with call progress detector output. In
the presence of supervisory tones, the call progress
Description
The ZL490xx is a family of high performance DTMF
receivers which decode all 16 tone pairs into a 4-bit
binary code. These devices incorporate an AGC for
wide dynamic range and are suitable for end-to-end
signalling. The ZL490x0 provides an early steering
(ESt) logic output to indicate the detection of a DTMF
PWDN
VDD
VSS
1
Voltage
Bias Circuit
Steering
Circuit
High
Group
Filter
Anti-
alias
Filter
Dial
Tone
Filter
Low
Group
Filter
Digital
Detector
Algorithm
Code
Converter
and
Latch
Digital
Guard
Time
3
Parallel to
Serial
Converter
& Latch
ESt
or
DStD
ACK
AGC
Mux
SD
2
OSC2
OSC1
(CLK)
Oscillator
and
Clock
Circuit
To All Chip Clocks
Energy
Detection
1.
ZL49010/1 and ZL49030/1 only.
2.
ZL49020/1 and ZL49030/1 only.
3.
ZL490x1 only.
Figure 1 - Functional Block Diagram
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2003, Zarlink Semiconductor Inc. All Rights Reserved.

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