ZL49200 Datasheet PDF - Zarlink Semiconductor
| Part Number | ZL49200 | |
| Description | Dual Channel SLIC | |
| Manufacturers | Zarlink Semiconductor | |
| Logo |  |
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ZL49200
Dual Channel SLIC
Data Sheet
Features
• Transformerless 2 W to 4 W conversion
• Controls battery feed to line
• Off-hook and dial pulse detection
• Ring ground over-current protection
• Programmable constant current feed
• -30 V to -72 V battery operation
• Relay and line driver electronics on board
Applications
• PABX/ONS/OPS
• Key Telephone Systems
• Integrated Access Devices
• SOHO and Home Gateway
December 2005
Ordering Information
ZL49200MDC 38 Pin SIL Trays
-40°C to +85°C
Description
The Zarlink ZL49200 Dual SLIC hybrid provides an
interface between a switching system and a subscriber
loop with 600 Ω impedance. The functions provided by
each SLIC include battery feed, 2 W to 4 W
conversion, off-hook and dial pulse detection. All driver
electronics are included on the hybrid in order to
minimize the number of external components required
by the user.
Loop Length determination table provided on page 9.
VBAT
VDD VEE GND
TIP
RING
Tip Drive
Controller
Audio Gain & Network
Balance circuit
VX
VR
Line Sense
2W to 4W
Conversion & Line
Impedance
Over-Current
Protection circuit
Ring Drive
Controller
Loop Supervision
RF RV
C1
5v External Electro-
mechanical relay,
DPDT/2 Form C
C7 100nF, 20%
C6 1µF, 20%, 16V Ringing Signal
C7
Relay
Driver
RLYD
C6 GND
VLC
SHK
VRLY
RLYC
Figure 1 - Dual Channel SLIC Single Channel Schematic Diagram
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2004-2005, Zarlink Semiconductor Inc. All Rights Reserved.
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ZL49200
Application Information
Most PBX applications will have line lengths less than 2 km
Most C.O.... applications will have line lengths up to 5 km
A single No 22 (AWG) cable is about 250 Ohms/km
Data Sheet
A PBX operating loop (RLOOP) or ONS will normally be below 1000 Ohms, (incl.... phone).
A C.O. operating loop (RLOOP) or OPS could be up to 3000 Ohms (incl.... phone).
ONS therefore are normally short loops whilst OPS are normally long loops.
This affects the Battery Feed function of the SLIC.
There are various parameters that affect the battery feed requirements.
Resistance of the line
Resistance of the phone
Loop current
Feed resistor value
Line driver voltage drop
Battery voltage
RL
RP
ILOOP
RF
VLD
VBAT
Maximum limit that you must be capable handling
Normally fixed for a particular country
Normally fixed for a particular country
Fixed in the SLIC design
Fixed by the product, usually between 8 V to 10 V depending on VBAT
Fixed in the system
If we wish to work out what is the maximum Line resistance we can handle we can use the following formulae:
RL = {[-VBAT - VLD] / ILOOP} - [RP + 2RF]}
Typical values of VLD = 10V, ILOOP = 15 to 30mA, RF = 50 to 300 Ohms and RP = 300 Ohms
If we set VBAT = -72V, ILOOP = 18mA,assume the phone is 300 Ohms and use a hybrid with RF = 220 Ohms and VLD
=10V like the ZL49200 we get:
RL = {[-VBAT - VLD] / ILOOP} - [RP + 2RF]
RL = {[72V - 10V)] / 18mA} - [300R + 2x220R]
Therefore RL = 2700 Ohms (or RLOOP = 3000 Ohms incl... phone)
Equivalent line length = (RL/2) / (250 ohm/km) = 5.4km
If we set VBAT = -48V, ILOOP = 18mA,assume the phone is 300 Ohms and use a hybrid with RF = 220 Ohms and VLD
=10V like the ZL49200 we get:
RL = {[-VBAT - VLD] / ILOOP} - [RP + 2RF]}
RL = { [48V - 10V] / 18mA} - [ 300R + 2x220R]
Therefore RL = 1371 Ohms (or RLOOP =1671 Ohms incl... phone)
Equivalent line length = (RL/2) / (250 ohm/km) = 2.7km
5
Zarlink Semiconductor Inc.
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| Information | Total 11 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ ZL49200.PDF Datasheet ] | |
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