PBL386402SOAXT Lantiq, PBL386402SOAXT Datasheet - Page 37

• Manufacturer Part Number: PBL386402SOAXT
• Manufacturer: Lantiq

Specifications of PBL386402SOAXT

• Number Of Channels: 1
• On-hook Transmission: Yes
• Polarity Reversal: Yes
• On-chip Ring Relay Driver: Yes
• Operating Temp Range: -40C to 85C
• Loop Current Limit: 45mA
• Operating Temperature Classification: Industrial
• Pin Count: 24
• Mounting: Surface Mount
• Operating Supply Voltage (max): 5.25/-58V
• Lead Free Status / RoHS Status: Compliant

5.7
A feedback loop within the SLIC counteracts longitudinal voltages at the two-wire port by
injecting longitudinal currents in opposing phase. Thus longitudinal disturbances will
appear as longitudinal currents and the TIPX and RINGX terminals will experience very
small longitudinal voltage excursions, leaving metallic voltages well within the SLIC
common mode range.
The SLIC longitudinal impedance per wire,
longitudinal disturbances. It should be noted that longitudinal currents may exceed the
DC loop current without disturbing the VF transmission.
5.8
The capacitors designated
ground as well as between RINGX and ground, can be used for RFI filtering. The
recommended value for
used, but care must be taken to prevent degradation of either longitudinal balance or
return loss.
1/(
impedance of 1/(2
5.9
The high pass filter capacitor connected between terminals HP and TIPX provides the
separation of the AC and DC signals, such that only AC signals are forwarded to the VTX
terminal.
loop in the SLIC. A
3 dB break point of the AC loop at 1.8 Hz (
where
5.10
The capacitor
forms, together with
high-pass RC filter. It is recommended to position the 3 dB break point of this filter
between 30 and 80 Hz to get a faster response for the DC steps that may occur at DTMF
signalling.
5.11
The capacitor
high end frequency break point of the low pass filter in the DC feedback loop (battery
feed controlling loop) of the SLIC.
the total two-wire output impedance of the SLIC. The choice of these programmable
Data Sheet
f C
R
HP
C
HP
= 600 k (see
RC
Longitudinal Impedance
Capacitors
AC - DC Separation Capacitor,
High-pass Transmit Filter
Capacitor
C
), a TIPX to ground impedance of 1/(2
positions the low end frequency response break point of the AC feedback
C
C
TC
TX
LP
, which connects between the terminals LP and VBAT, positions the
and
in
R
C
Figure 9
f C
TX
HP
C
C
and/or the input impedance of a programmable CODEC/filter, a
value of 150 nF will position the low end frequency response
C
C
RC
LP
Table
RC
TC
TC
C
contribute to a metallic impedance of 1/(
).
and
and
TC
connected between the VTX output and the CODEC/filter
9).
and
C
C
C
LP
RC
RC
C
together with
is 2200 pF. Higher capacitance values may be
RC
37
in
Z
f
3dB
LOT
Figure
) according to
C
and
HP
C
Z
9, connected between TIPX and
HP
LOR
f C
and
, appears as typically 20
TC
Z
T
f
) and a RINGX to ground
3dB
(see
= 1/(2
Chapter
Rev. 2.0, 2005-04-14
PBL 38640/2
Transmission
FlexiSLIC
R
f C
5.2) forms
HP
TC
C
) =
HP
to
)