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參數資料
| 型號： | L9217A |
| 英文描述： | CAP CER 2700PF 3.15KVDC R3 RAD |
| 中文描述： | 低成本線接口，具有反向電池和PPM |
| 文件頁數： | 5/30頁 |
| 文件大小： | 414K |
| 代理商： | L9217A |
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Agere Systems Inc.
5
Data Sheet
November 2001
with Reverse Battery and PPM
L9217A/G Low-Cost Line Interface
Pin Information
(continued)
Table 1. Pin Descriptions
(continued)
PLCC
7
Symbol
LCTH
Type
I
Description
Loop Closure Threshold Input.
Connect a resistor to DCOUT to set off-hook
threshold.
dc Output Voltage.
This output is a voltage that is directly proportional to the abso-
lute value of the differential tip/ring current.
Battery Supply.
Negative high-voltage power supply.
Protected Ring.
The output of the ring driver amplifier and input to loop sensing cir-
cuitry. 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.
State Control Input.
B0, B1, and B2 determine the state of the SLIC. See Table 2.
Pin B2 has internal pull-down.
State Control Input.
B0, B1, and B2 determine the state of the SLIC. See Table 2.
Pin B1 has internal pull-down.
State Control Input.
B0, B1, and B2 determine the state of the SLIC. See Table 2.
Pin B0 has internal pull-down.
Analog Signal Ground.
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.
Receive PPM Signal Input.
This high-impedance input controls the PPM differential
voltage on tip and ring. The PPM signal may be present at this pin at all times: how-
ever, PPM will only be transmitted to tip and ring if the appropriate PPM state is cho-
sen. ac couple the PPM signal to this node.
Ring Trip Detector Output/Loop Detector Output.
When low, this logic output indi-
cates that ringing is tripped or that an off-hook condition exists.
ac Output Voltage.
The voltage at this point is directly proportional to the differential
tip/ring current.
ac/dc Separation.
Connect a 0.1
μ
F capacitor from this point to VTX.
ac Output Voltage.
This output is a voltage that is directly proportional to the differ-
ential tip/ring current.
Transmit Gain.
Connect an 8.06 k
from TG to VTX to set the transmit gain of the
SLIC.
PPM Overhead.
Connect a resistor from this node to ground to set the overhead volt-
age during PPM high overhead modes.
PPM Signal Output.
Connect a resistor from this node to TG for hybrid cancellation
of the periodic pulse metering (PPM) signal.
8
DCOUT
O
9
10
V
BAT
PR
—
I/O
11
12
13
CF2
CF1
B2
—
—
I
14
B1
I
15
B0
I
16
17
18
AGND
BGND
PT
—
—
I/O
19
RTSN
I
20
RTSP
I
21
PPMIN
I
22
NSTAT
O
23
VITR
O
24
25
TXI
VTX
I
O
26
TG
—
27
OVH
I
28
PPMOUT
O
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