PEB 4364 T V1.2 Infineon Technologies, PEB 4364 T V1.2 Datasheet - Page 90

• Manufacturer Part Number: PEB 4364 T V1.2
• Description: IC SLIC VOICE ACCESS PDSO-36
• Manufacturer: Infineon Technologies
• Series: DuSLICr

Specifications of PEB 4364 T V1.2

• Function: Dual Channel Subscriber Line Interface Circuit (DuSLIC)
• Interface: IOM-2, PCM
• Number Of Circuits: 2
• Voltage - Supply: 3.3 V ~ 5 V
• Current - Supply: 105mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-PDSO
• Includes: DTMF Generator and Decoder, Line Echo Cancellation (LEC), Teletax (TTX) Generation, Universal Tone Detection (UTD)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Other names: PEB4364TV1.2XT; SP000007728

DuSLIC
Operational Description
3.7
Power Management and Operating Modes
In many applications the power dissipated on the linecard is a critical parameter. In large
systems it is the mean power value (taking into account traffic statistics and line length
distribution) that determines cooling requirements. On the other hand, particularly in
remotely fed systems, the maximum power per line must be kept below a given limit.
Generally, system power dissipation is determined primarily by the high-voltage part.
The most effective power-saving method thus is to optimize both SLIC functionality and
supply voltage. This is primarily achieved by using different operating modes.
The three main modes (Power Down, Active and Ringing) correspond to the main
system states: on-hook, signal transmission (voice, DTMF and/or TTX) and ring signal
feed.
Power Down
Off-hook detection is the only function available. It is achieved by internally connecting
5 k
resistors from Tip to BGND and from Ring to V
. A simple sensing circuit
BAT
supervises the DC current through these resistors (zero in on-hook and non-zero in
off-hook state). This scaled transversal line current is transferred to the IT pin and
compared with a programmable current threshold in the SLICOFI-2x. Only the DC loop
in the SLICOFI-2x is active.
Sleep Mode
In Sleep mode both AC and DC loops are inactive. Off-hook detection, however, is still
possible using an analog comparator. For lowest power consumption the clocks fed to
the MCLK and PCLK pins also must be shut off.
To change the DuSLIC to another state, it must be woken up according to the procedure
described in
Chapter
3.1.
Active
Both AC and DC loops are operative. The SLIC provides low-impedance voltage feed to
the line. An integrated supply voltage switch allows to choose between two (SLIC-S/E)
or even three (SLIC-P) different battery voltages, depending on loop length.
Ringing
For internal ringing applications, the total supply range can be extended to 150 V to allow
ring signals up to 85 Vrms. Whereas SLIC-S/E uses a positive supply VHR, the most
negative battery voltage VBATR is intended for ringing with SLIC-P. The voltage
capability is sufficient to drive very long lines at any ringer load and to reliably detect Ring
trip. For an overview of all DuSLIC operating modes, see
Table 14
for PEB 4264/-2,
Table 15
for PEB 4265/-2 and
Table 16
for PEB 4266.
Preliminary Data Sheet
90
DS3, 2003-07-11