L9216G データシートの表示（PDF） - Agere -> LSI Corporation
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L9216G Datasheet PDF : 48 Pages
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L9216A/G
Short-Loop Ringing SLIC with Ground Start
Preliminary Data Sheet
September 2001
Pin Information (continued)
Table 1. Pin Descriptions (continued)
28-Pin
PLCC
19
20
21
22
23
24
25
26
27
28
48-Pin
MLCC
25
26
29
31
33
34
35
38
40
41
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.
FB1
— 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.
PT
I/O 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.
PR
I/O 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.
B2
Id State Control Input. These pins have an internal 110 kΩ pull-down.
B1
Id
B0
Id
ITR
I Transmit Gain. Input to AX amplifier. Connect a 4.75 kΩ 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.
VTX
O ac Output Voltage. Output of internal AX amplifier. The voltage at this
pin is directly proportional to the differential tip/ring current.
TXI
I ac/dc Separation. Input to internal AAC amplifier. Connect a 0.1 µF
capacitor from this pin to VTX.
Operating States
Table 2. Control States
B0
B1
B2
1
1
0
1
0
0
1
1
1
1
0
1
0
0
1
0
1
1
0
0
0
0
1
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
Table 3. Supervision Coding
NSTAT
RGDET
0 = off-hook or ring trip or TSD.
0 = no ring or tip ground.
1 = on-hook and no ring trip and no TSD or DISCONNECT state. 1 = ring or tip ground.
10
Agere Systems Inc.
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