pef4265 Infineon Technologies Corporation, pef4265 Datasheet - Page 7

• Manufacturer Part Number: pef4265
• Description: Subscriber Line Interface Circuit Enhanced Feature Set
• Manufacturer: Infineon Technologies Corporation

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Infineon Technologies’ new high voltage ringing Subscriber Line Interface Circuit SLIC-E (PEF 4265 V2.1) is the
latest out of the well-known and broadly used SLIC-E family. It has been designed not only to cover all previous
SLIC-E applications, but also for particular “ADSL friendliness” and thus enables the realization of highly cost
optimized integrated voice data (IVD) systems. Special effort has been put on minimizing the influence of line
voltage transients and distortions caused by mode transitions and the associated unavoidable impedance
changes.
As SLIC-E V2.1 is pin compatible with its previous versions, it can be operated with all codec devices of the
DuSLIC™ or VINETIC™ chip sets. The highly flexible device offers 3.3 V compatibility and integrated balanced
ringing up to 85 V
transmission, whereas in the ring mode an additional positive supply voltage is used.
To minimize the average system power dissipation, a power-down mode can be utilized; the transmission part is
switched off completely and off-hook supervision is provided by activating a simple line current sensor with
negligible power consumption.
SLIC-E V2.1 is available in a single (PEF 4265) channel version in either PG-DSO-20-24 or PG-VQFN-48-48
power packages, or in a dual channel version (PEF 4365), packaged in PG-DSO-36-15.
1.1
Compared with the previous version of SLIC-E, PEF 4265 V1.2, the new version V2.1 is characterized by the
following changes:
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Preliminary Data Sheet
Improved high-frequency noise and distortion performance
Optimized mode transitions to minimize influence on ADSL data in IVD systems
Compatible with both 3.3 and 5 V VDD supplies
High impedance DC inputs
Fully differential receive path - VCMS pin not required
Fast current limitation for improved overvoltage behaviour
Application circuit:
– 100 nF / 50 V capacitor at CEXT
– Per channel series diode in VBATL supply mandatory (no shared diodes)
General Description
Version 2.1: Summary of Changes
rms
. Integrated supply switches allow the choice between two negative battery voltages for voice
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PEF 4265 / PEF 4365
Revision 2.2, 2008-02-06
SLIC-E / TSLIC-E
General Description