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參數資料
| 型號： | L9500A |
| 英文描述： | High-Voltage Ringing SLIC for VolP Applications |
| 中文描述： | 高壓振鈴用戶接口應用的福爾普 |
| 文件頁數： | 9/32頁 |
| 文件大小： | 616K |
| 代理商： | L9500A |
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Preliminary Data Sheet
September 2001
High-Voltage Ringing SLIC for VoIP Applications
L9500A
Agere Systems Inc.
9
Pin Information
(continued)
Table 1. Pin Descriptions
(continued)
Operating States
Table 2. Control States
Table 3. Supervision Coding
28-Pin
PLCC
19
48-Pin
MLCC
25
Symbol Type
Name/Function
FB2
—
Polarity Reversal Slowdown Capacitor.
Connect a capacitor
from this node for controlling rate of battery reversal. If ramped bat-
tery reversal is not desired, this pin is left open.
Polarity Reversal Slowdown Capacitor.
Connect a capacitor
from this node for controlling rate of battery reversal. If ramped bat-
tery reversal is not desired, this pin is left open.
Protected Tip.
The output drive of the tip amplifier and input to the
loop sensing circuit. Connect to loop through overvoltage and
overcurrent protection.
Protected Ring.
The output drive of the ring amplifier and input to
the loop sensing circuit. Connect to loop through overvoltage and
overcurrent protection.
State Control Input.
These pins have an internal 100 k
pull-up.
State Control Input.
These pins have an internal 100 k
pull-up.
State Control Input.
These pins have an internal 100 k
pull-up.
Transmit Gain.
Input to AX amplifier. Connect a 4.75 k
resistor
from this node to VTX to set transmit gain. Gain shaping for termi-
nation impedance with a first generation codec is also achieved
with a network from this node to VTX.
ac Output Voltage.
Output of internal AX amplifier. The voltage at
this pin is directly proportional to the differential tip/ring current.
ac/dc Separation.
Input to internal AAC amplifier. Connect a
0.1
μ
F capacitor from this pin to VTX.
20
26
FB1
—
21
28
PT
I/O
22
31
PR
I/O
23
24
25
26
33
34
35
38
B2
B1
B0
ITR
I
u
I
u
I
u
I
27
39
VTX
O
28
41
TXI
I
B0
0
0
0
0
1
1
1
1
B1
0
1
0
1
1
0
1
0
B2
1
1
0
0
0
0
1
1
State
Forward active
Reverse active
On-hook transmission forward battery
On-hook transmission reverse battery
Ground start
Scan
Disconnect—device will power up in this state
Ring
NSTAT
0 = off-hook or ring trip or thermal shutdown or ring ground.
1 = on-hook and no ring trip and no thermal shutdown and no ring ground.
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