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参数资料
| 型号： | PBL386402SOS |
| 厂商： | ERICSSON |
| 英文描述： | Subscriber Line Interface Circuit |
| 中文描述： | 用户线接口电路 |
| 文件页数： | 11/16页 |
| 文件大小： | 138K |
| 代理商： | PBL386402SOS |
PBL 386 40/2
11
Figure 10. Hybrid function.
When choosing R
, make sure the output
load of the VTX terminal is >20 k
.
If calculation of the Z
formula above
yields a balance network containing an
inductor, an alternate method is recom-
mended. Contact Ericsson Microelectron-
ics for assistance.
The PBL 386 40/2 SLIC may also be
used together with programmable
CODEC/filters. The programmable
CODEC/filter allows for system controller
adjustment of hybrid balance to accom-
modate different line impedances without
change of hardware. In addition, the
transmit and receive gain may be ad-
justed. Please, refer to the programm-
able CODEC/filter data sheets for design
information.
Longitudinal Impedance
A Feed back loop counteracts longitudi-
nal 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 experi-
ence very small longitudinal voltage
excursions, leaving metallic voltages well
within the SLIC common mode range.
The SLIC longitudinal impedance per
wire, Z
and Z
, appears as typically
20
to longitudinal disturbances. It
should be noted that longitudinal currents
may exceed the dc loop current without
disturbing the vf transmission.
Capacitors C
TC
and C
RC
The capacitors designated C
and C
RC
in figure 12, connected between TIPX
and ground as well as between RINGX
and ground, can be used for RFI filter-
ing.. The recommended value for C
and C
is 2200 pF. Higher capacitance
values may be used, but care must be
taken to prevent degradation of either
longitudinal balance or return loss. C
and C
contribute to a metallic imped-
ance of 1/(
π
·f·C
) = 1/(
π
·f·C
), a TIPX to
ground impedance of 1/(2·
π
·f·C
) and a
RINGX to ground impedance of 1/
(2·
π
·f·C
RC
).
AC - DC Separation Capacitor, C
HP
The high pass filter capacitor connected
between terminals HP and TIPX provides
the separation of the ac signal from the
dc part. C
HP
positions the low end
V
T
Combination
CODEC/Filter
R
TX
R
FB
Z
B
Z
RX
Z
T
VTX
RSN
V
RX
PBL
386 40/2
frequency response break point of the ac
loop in the SLIC. Refer to table 1 for
recommended values of C
.
Example: A C
value of 150 nF will
position the low end frequency response
3dB break point of the ac loop at 1.8 Hz
(f
) according to f
3dB
= 1/(2·
π
·R
HP
·C
HP
)
where R
HP
= 600 k
.
High-Pass Transmit Filter
The capacitor C
in figure 12 connected
between the VTX output and the
CODEC/filter forms, together with R
TX
and/or the input impedance of a pro-
grammable CODEC/filter, a 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.
Capacitor C
LP
The capacitor C
, which connects between
the terminals CLP and VBAT, positions
together with the resistive loop feed resis-
tor R
(see section Battery Feed), the high
end frequency break point of the low pass
filter in the dc loop in the SLIC. C
together
with R
, C
and Z
(see section Two-Wire
Impedance) forms the total two wire output
impedance of the SLIC. The choise of
these programmable components have an
influence on the power supply rejection
ratio (PSRR) from VBAT to the two wire
side at sub-audio frequencies. At these
frequencies capacitor C
also influences
the transversal to longitudinal balance in
the SLIC. Table 1 suggests suitable values
on C
for different Feeding characteristics.
Typical values of the transversal to longitu-
dinal balance (T-L bal.) at 200Hz is given in
table 1 for the chosen values on C
LP
.
R
Feed
R
SG
C
LP
T-L bal. C
HP
@200Hz
[dB]
-46
-46
-43
-36
[
]
2
50
2
200
2
400
2
800
[k
]
0
60.4
147
301
[nF]
150
100
47
22
[nF]
47
150
150
150
Table 1. R
, C
and C
values for
different Feeding characteristics.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PBL386402SOT | 制造商:ERICSSON 制造商全称:Ericsson 功能描述:Subscriber Line Interface Circuit |
| PBL386402SOTNT | 制造商:Infineon Technologies AG 功能描述:SLIC 1-CH 66dB 45mA 5V/-9V/-12V/-15V/-18V/-24V/-28V 24-Pin DSO T/R |
| PBL38650/2QNA | 功能描述:IC LINE INTERFACE SLIC PLCC-28 RoHS:否 类别:集成电路 (IC) >> 接口 - 电信 系列:FlexiSLIC™ 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 06/Feb/2012 标准包装:750 系列:* |
| PBL38650/2QNS | 功能描述:IC LINE INTERFACE SLIC PLCC-28 RoHS:否 类别:集成电路 (IC) >> 接口 - 电信 系列:FlexiSLIC™ 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 06/Feb/2012 标准包装:750 系列:* |
| PBL38650/2QNT | 功能描述:IC LINE INTERFACE SLIC PLCC-28 RoHS:否 类别:集成电路 (IC) >> 接口 - 电信 系列:FlexiSLIC™ 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 06/Feb/2012 标准包装:750 系列:* |
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