PEB 4364 T V1.2 Infineon Technologies, PEB 4364 T V1.2 Datasheet - Page 46

• 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

current I
DC component of the ring current. If the DC current exceeds the programmed ring trip
threshold, SLICOFI-2x generates an interrupt. Ring trip is reliably detected and reported
within two ring signal periods. The ringing signal is switched off automatically at zero
crossing by the SLICOFI-2x. The threshold for the ring trip DC current is set internally in
the SLICOFI-2x and programmed via the digital interface. The DC offset for ring trip
detection can be generated by the DuSLIC chip set and the internal ring trip function can
be used even if an external ringing generator is used.
AC Ring Trip Detection
For short lines (< 1 k loop length) and for low-power applications, the DC offset can be
avoided to reduce the battery voltage for a given ring amplitude. Ring trip detection is
done by rectifying the ring current I
comparing it to a programmable AC ring trip threshold. If the ring current exceeds the
programmed threshold, the HOOK bit in register INTREG1 is set accordingly.
Most applications that utilize the DuSLIC chip set use the DC ring trip detection, which
is more reliable than AC ring trip detection.
2.5.3
There are two methods of ringing:
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Internal balanced ringing generally offers more benefits compared to unbalanced
ringing:
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The phone itself cannot distinguish between balanced and unbalanced ringing. Where
unbalanced ringing is still used, it is often simply an historical leftover. For a comparison
between balanced and unbalanced ringing, see also ANSI document T1.401-1993.
Additionally, integrated ringing with the DuSLIC offers the following advantages:
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Preliminary Data Sheet
Balanced ringing (bridged ringing)
Unbalanced ringing (divided ringing)
Balanced ringing produces much less longitudinal voltage, which results in a lower
amount of noise coupled into adjacent cable pairs (e.g. ADSL lines).
By using a differential ringing signal, lower supply voltages become possible
Internal ringing (no need for external ringing generator and relays)
Reduction of board space because of much higher integration and fewer external
components
Programmable ringing amplitude, frequency, and ringing DC offset without hardware
changes
Programmable ring trip thresholds
Switching of the ringing signal at zero-crossing. With relays there is always some
residual switching noise, which can cause interference on adjacent cable pairs (e.g.
ADSL).
TRANS
Ringing Methods
over one ringer period. This causes the integration result to represent the
TRANS
46
, integrating it over one ringer period and
Functional Description
DS3, 2003-07-11
DuSLIC