參數(shù)資料
型號(hào)： L8551
廠商： Lineage Power
英文描述： Low-Power SLIC(低功耗用戶線接口（SLIC）)
中文描述： 低功耗用戶接口（低功耗用戶線接口電路（SLIC））
文件頁(yè)數(shù)： 5/32頁(yè)
文件大?。?/td> 526K
代理商： L8551
Lucent Technologies Inc.
5
Data Sheet
March 1997
L8551 Low-Power SLIC
Pin Information
(continued)
Table 1. Pin Descriptions
(continued)
32-
Pin
PLCC
11
44-
Pin
PLCC
16
Symbol
Type
Description
PR
I/O
Protected Ring.
The output of the ring driver amplifier and input to loop sensing
circuitry. Connect to the loop through overvoltage protection.
Filter Capacitor 2.
Connect a 0.1
μ
F capacitor from this pin to AGND.
Filter Capacitor 1.
Connect a 0.47
μ
F capacitor from this pin to pin CF2.
Transmit ac Output Voltage.
This output is a voltage that is directly proportional
to the differential Tip/Ring current.
Common-Mode Current Sense.
To program ring ground sense threshold, con-
nect a resistor to V
CC
and connect a capacitor to AGND to filter 50 Hz/60 Hz. If
unused, the pin should be connected to ground.
Ring Ground Detect.
When high, this open-collector output indicates the pres-
ence of a ring ground. To use, connect a 100 k
resistor to V
CC
.
State Control Input.
B0 and B1 determine the state of the SLIC. See Table 2.
Analog Signal Ground
.
dc Resistance for Low Loop Currents.
Leave open for dc feed resistance of
115
, or short to DCOUT for 610
. Intermediate values can be set by a simple
resistor divider from DCOUT to ground with the tap at DCR.
Battery Ground.
Ground return for the battery supply.
Protected Tip
. The output of the tip driver amplifier and input to loop sensing cir-
cuitry. Connect to loop through overvoltage protection.
Ring Trip Sense Negative
. Connect this pin to the ringing generator signal
through a high-value resistor.
Ring Trip Sense Positive
. Connect this pin to the ring relay and the ringer
series resistor through a high-value resistor.
Ring Trip Detector Output
. When low, this logic output indicates that ringing is
tripped.
Loop Detector Output
. When low, this logic output indicates an off-hook condi-
tion.
State Control Input
. B0 and B1 determine the state of the SLIC. See Table 2.
Pin B1 has a 40 k
pull-up. It goes low in the event of thermal shutdown.
Transmit ac Output Voltage
. The output of the uncommitted operational ampli-
fier.
Summing Node
. The inverting input of the uncommitted operational amplifier. A
resistor or network to XMT sets the gain.
Transmit Gain.
Connect a 25.5 k
from TG to VITR to set the transmit gain of
the SLIC.
12
13
14
18
19
20
CF2
CF1
VITR
—
—
O
15
21
ICM
I
16
22
RGDET
O
17
23
B0
I
18, 19
20
24, 25
26
AGND
DCR
—
I
21
22
27
30
BGND
PT
—
I/O
23
31
RTSN
I
24
32
RTSP
I
25
33
NRDET
O
26
34
NLC
O
27
36
B1
I/O
28
37
XMT
O
29
38
SN
I
30
40
TG
—
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