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参数资料
型号： PBL386212SOT
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： 13/16页
文件大小： 130K
代理商： PBL386212SOT
PBL 386 21/2
13
is energized, dc current flows and the
comparator input voltage reverses polar-
ity.
Figure 11 gives an example of a ring trip
detection network. This network is
applicable, when the ring voltage is
superimposed on V
and is injected on the
ring lead of the two-wire port. The dc voltage
across sense resistor R
is monitored by
the ring trip comparator input DT and DR
via the network R
, R
, R
, R
, C
and C
2
.
With the line on-hook (no dc current) DT is
more positive than DR and the DET output
will report logic level high, i.e. the detector
is not tripped. When the line goes off-hook,
while ringing, a dc current will flow through
the loop including sense resistor R
and
will cause input DT to become more
negative than input DR. This changes out-
put DET to logic level low, i.e. tripped
detector condition. The system controller
(or line card processor) responds by de-
energizing the ring relay, i.e. ring trip.
Complete filtering of the 20 Hz ac
component at terminal DT and DR is not
necessary. A toggling DET output can be
examined by a software routine to deter-
mine the duty cycle. When the DET output
is at logic level low for more than half the
time, off-hook condition is indicated.
Ringing State
The ring relay driver and the ring trip detector
are activated and the ring trip detector is
indicating off hook with a logic low level at
the detector output.
As the SLIC do not have any stand by state
the SLIC will remain in the active normal
state.
Active States
TIPX is the terminal closest to ground and
sources loop current while RINGX is the
more negative terminal and sinks loop
current. Vf signal transmission is normal.
The loop current or the ground key detector
is activated. The loop current detector is
indicating off hook with a logic low level and
the ground key detector is indicating active
ground key with a logic high level present at
the detector output.
Relay driver
The PBL 386 21/2 SLIC incorporates a ring
relay driver designed as open collector
(npn) with a current sinking capability of
50 mA. The drive transistor emitter is
connected to BGND. The relay driver has
an internal zener diode clamp for inductive
kick-back voltages.Care must be taken
when using the relay driver together with
relays that have high impedance.
Control Inputs
The PBL 386 21/2 SLIC has three digital
control inputs, C1, C2 and C3.
A decoder in the SLIC interprets the control
input condition and sets up the commanded
operating state.
C1 to C3 are internal pull-up inputs.
Open Circuit State
In the Open Circuit State the TIPX and
RINGX line drive amplifiers as well as other
circuit blocks are powered down. This
causes the SLIC to present a high
impedance to the line. Power dissipation is
at a minimum and no detectors are active.
Figure 10. Programmable overhead voltage (POV). R
L
= 600
or
∞
.
0
10
20
30
40
50
60
0
1
2
3
4
5
6
7
V
T
P
)
R
OV
(k
)
相关PDF资料
PDF描述
PBL38621-2 Subscriber Line Interface Circuit
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相关代理商/技术参数
参数描述
PBL386212SOTNT 制造商:Infineon Technologies AG 功能描述:SLIC 1-CH 75dB 30mA 5V 24-Pin SSOP T/R
PBL38627/2SOTR2B 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Infineon Technologies AG 功能描述:
PBL38630/2QNA 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:*
PBL38630/2QNT 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:*
PBL38630/2R2 制造商:Infineon Technologies AG 功能描述:TELECOM-SLIC, SO-24
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