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参数资料
| 型号： | PBL38650-2 |
| 厂商： | ERICSSON |
| 元件分类： | 其它接口 |
| 英文描述： | TERMINAL |
| 中文描述： | IGBT模块 |
| 文件页数： | 11/16页 |
| 文件大小： | 141K |
| 代理商： | PBL38650-2 |
PBL 386 50/2
11
ance) 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 longitudinal 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.
Figure 10. Hybrid function.
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 50/2 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
adjusted. Please, refer to the program-
mable 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 filtering.
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
TC
) and a
RINGX to ground impedance of
1/(2·
π
·f·C
RC
).
AC - DC Separation Capacitor, C
HP
The high pass filter capacitor con-
nected between terminals HP and TIPX
provides the separation of the ac signal
from the dc part. C
positions the low
end 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 con-
nected 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 resistor 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
HP
and Z
T
(see section Two-Wire Imped-
V
T
Combination
CODEC/Filter
R
TX
R
FB
Z
B
Z
RX
Z
T
VTX
RSN
V
RX
PBL
386 50/2
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