ADSL MAGNETICS
For Alcatel MTK 20130/20140/20150
TM00300
APPLICATION NOTES
Bel has developed a complete magnetics solution to work with Alcatel “DynaMiTe™” MTK20130, MTK20140 and
MTK20140 third, fourth and fifth generation of Rate Adaptive Asymmetrical Digital Subscriber Line (ADSL) chipset
designs, for central office (CO) or remote (CPE) applications, bel offer a solution for ADSL over POTS or ADSL over
ISDN, Bel solution consist of :
IsolationTransformers
Bel offer isolation transformers for CO and CPE applications, ADSL over POTS or ADSL over ISDN. Bel isolation
transformer for ADSL over POTS for CO application is available on surface mount (S560-6600-G1) or through hole
(0560-6600-C7) provide POTS signal filtering from the line, it also matches the line impedance to the hybrid imped-
ance (100Ω:25Ω).0560-6600-25 and S560-6600-40 are the CPE alternatives for ADSL over POTS.0560-6600-L9
and S560-6600-M1 are the ADLS over ISDN offerings. All isolation transformers meet standard safety regulation
requirements per EN60950/UL1950 supplementary isolation. Isolation transformers can be used with all different
Alcatel Chipsets.
Transmit and ReceiveTransformers for Hybrid Circuit
Individual SMD and TH transformers are offered for the Receive andTransmit magnetic hybrid circuit, these designs
offer a smaller footprint desirable on highly populated boards. Refer to figure 1 for a typical implementation using
small footprint transformers. Bel offers a complete range of transmit and receive transformers for Alcatel
MTK20130, 20140 20150 chipsets.
0560-6600-49TH and S560-6600-J2 SMD transformers offer the flexibility to be connected as Receive orTransmit
transformers on the magnetic hybrid circuit. See figure 2 for a typical circuit implementation using these transformer
solution. Bel currently offer this solution for Alcatel MTK20130 & 20140 only.
Integrated Receive andTransmit magnetic hybrid Circuit Package.
In multi-port system applications, where board layout is limited Bel has designed a package that integrates receive
and transmit transformers for the hybrid circuit (S560-6600-A6 & S560-6600-K8).These designs are four-port
devices that offer in addition the required internal connections between receive and transmit transformers to con-
form the magnetic hybrid stage of the circuit.These designs uses toroidal magnetic cores for both receive and
transmit transformers, the toroidal cores offer low cross talk features facilitating package integration, with optimum
transmission characteristics and high radio frequency suppression due to shortest possible connection paths.
Figures 4, 5 & 6 depict different equivalent schematics for the magnetic hybrid circuit arrangements, all schematics
presented are electrically equivalent, bel S560-6600-A6 or S560-6600-K8 are substitutes for any or all arrangements
on figure 4,5 & 6 depending on the chipset used.
Receive andTransmit Filter Inductors.
Bel offers a an extensive line of low profile inductors to be used on transmit or receive filters for CO, CPE, ADSL
over POTS or ADSL over ISDN.These designs offer good immunity to EMI noise emissions offering flexibility in
high density boards. For complete range of inductance values and structures refer to the ADSL Inductors Section.
DynaMiTe™ is a trade mark of Alcatel Microelectronics.
©2000 Bel Fuse Inc. Specifications subject to change without notice. 07.00
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