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參數(shù)資料
| 型號： | L8576B |
| 英文描述： | Dual Ringing SLIC |
| 中文描述： | 雙振鈴用戶接口 |
| 文件頁數(shù)： | 6/26頁 |
| 文件大小： | 583K |
| 代理商： | L8576B |
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6
Agere Systems Inc.
Data Sheet
May 2001
L8576B Dual Ringing SLIC
Pin Information
(continued)
Table 1. Pin Descriptions
(continued)
* On the printed-wiring board (PWB), make the leads to BGND and V
BAT
as wide as possible for thermal and electrical reasons. Also, maxi-
mize the amount of PWB copper on all leads connected to this device for the lowest operating temperature.
Note: I
u
and O
u
indicate a pull-up device is included on this lead.
Pin,
Circuit
a
40
Pin,
Circuit
b
6
Symbol
Type
Name/Function
RNGNG
I
u
Ringing Input.
Refer to Operating States section. A pull-up device is
included.
Loop Detector Output/Ring Trip Detector Output.
When low, this lead indi-
cates an off-hook condition. When in ringing mode, a low output on this lead
indicates a ring trip. A pull-up device is included.
Disconnect Input
. Refer to Operating States section. A pull-up device is
included.
Power Resistor.
Connect a resistor between this pin and V
BAT
. A 2.2 k
, 2 W
resistor should be used for a V
BAT
of –68.5 V. See the Applications section to
calculate resistor values for other V
BAT
potentials.
Protected Tip.
The input to the tip fault protection and output of tip current
drive amplifier. Connect this pin to the tip of the loop through a 30
overvolt-
age protection resistor.
Protected Ring.
The input to the ring fault protection and output of ring cur-
rent drive amplifier. Connect this pin to the ring of the loop through a 30
overvoltage protection resistor.
Transmit ac Output Voltage.
This output is a voltage that is directly propor-
tional to the differential tip/ring current.
Transmit Gain 2.
Transmit gain and current limiting for ringing is set by the
value of R
GX2
. R
GX2
is connected between TG2 and VITR.
Transmit Gain 1.
Transmit gain is set by the series resistor combination of
R
GX1
and R
GX2
from this lead to TG2.
Ring Trip Filter.
Connect this lead to RTTH via a resistor and to AGND with a
capacitor to filter the ring trip circuit to prevent spurious responses.
Ring Trip Threshold.
Connect this lead to DC
OUT
via a resistor to set the ring
trip threshold.
dc Voltage Out
. This output is a voltage that is directly proportional to the
absolute value of the differential tip/ring current.
Current-Limit Program Input.
A resistor to DC
OUT
sets the dc current limit of
the circuit.
Receive Signal Input (+).
This high-impedance input controls the ac differen-
tial voltage on tip/ring.
Receive Signal Input (–).
This high-impedance input controls the ac differen-
tial voltage on tip/ring.
Analog Signal Ground.
Analog 5 V Power Supply.
Ringing Slope Resistor.
Connect this lead to AGND with a resistor to set the
slope of the ringing waveform. Note that this pin is shared with both sections.
39
7
NSTAT
O
u
38
8
NDISC
I
u
37
9
RPWR
—
36
10
PT
I/O
35
11
PR
I/O
34
12
VITR
O
33
13
TG2
—
32
14
TG1
—
31
15
RTFLT
—
30
16
RTTH
—
29
17
DC
OUT
O
28
18
I
PROG
I
27
19
RCVP
I
26
20
RCVN
I
25
24
23
21
22
23
AGND
V
CC
RRNG
—
—
—
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