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| 型號(hào)： | L9216A |
| 英文描述： | CAP CER 270PF 3.15KVDC R3 RAD |
| 中文描述： | 短環(huán)振鈴用戶(hù)接口與地面開(kāi)始 |
| 文件頁(yè)數(shù)： | 10/48頁(yè) |
| 文件大小： | 1062K |
| 代理商： | L9216A |
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Preliminary Data Sheet
September 2001
Short-Loop Ringing SLIC with Ground Start
L9216A/G
10
Agere Systems Inc.
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 to ground for controlling rate of battery reversal. If ramped
battery reversal is not desired, this pin is left open.
Polarity Reversal Slowdown Capacitor.
Connect a capacitor from
this node to ground for controlling rate of battery reversal. If ramped
battery 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 overcur-
rent protection.
Protected Ring.
The output drive of the ring amplifier and input to the
loop sensing circuit. Connect to loop through overvoltage and overcur-
rent protection.
State Control Input.
These pins have an internal 110 k
pull-down.
20
26
FB1
—
21
29
PT
I/O
22
31
PR
I/O
23
24
25
26
33
34
35
38
B2
B1
B0
ITR
I
d
I
d
I
d
I
Transmit Gain.
Input to AX amplifier. Connect a 4.75 k
resistor from
this node to VTX to set transmit gain. Gain shaping for termination
impedance with a first-generation codec is also achieved with a net-
work 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.
27
40
VTX
O
28
41
TXI
I
B0
1
1
1
1
0
0
0
0
B1
1
0
1
0
0
1
0
1
B2
0
0
1
1
1
1
0
0
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
RGDET
0 = off-hook or ring trip or TSD.
1 = on-hook and no ring trip and no TSD or DISCONNECT state.
0 = no ring or tip ground.
1 = ring or tip ground.
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