L9215G データシートの表示（PDF） - Agere -> LSI Corporation
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L9215G Datasheet PDF : 50 Pages
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L9215A/G
Short-Loop Sine Wave Ringing SLIC
Data Sheet
September 2001
Pin Information (continued)
Table 1. Pin Descriptions (continued)
32-Pin
PLCC
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
48-Pin
MLCC
15
16
19
20
22
23
24
25
26
29
31
33
34
35
36
38
40
41
Symbol
AGND
VCC
VBAT1
VBAT2
BGND
TRGDET
ICM
FB2
FB1
PT
PR
B2
B1
B0
BR
ITR
VTX
TXI
Type
Name/Function
GND
PWR
PWR
PWR
GND
O
I
—
—
I/O
I/O
Iu
Analog Signal Ground.
Analog Power Supply. User choice of 5 V or 3.3 V nominal power or sup-
ply.
Battery Supply 1. High-voltage battery.
Battery Supply 2. Lower-voltage battery.
Battery Ground. Ground return for the battery supplies.
Tip/Ring Ground Detect. When high, this open collector output indicates
the presence of a ring ground or a tip ground. This supervision output may
be used in ground key or common-mode fault detection applications.
Common-Mode Current Sense. To program tip or ring ground sense
threshold, connect a resistor to VCC and connect a capacitor to AGND to fil-
ter 50/60 Hz. If unused, the pin is connected to ground.
Polarity Reversal Slowdown Capacitor. Connect a capacitor from this
node 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 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 overcurrent pro-
tection.
Protected Ring. The output drive of the ring amplifier and input to the loop
sensing circuit. Connect to loop through overvoltage and overcurrent pro-
tection.
State Control Input. These pins have an internal 60 kΩ pull-up.
I Transmit Gain. Input to AX amplifier. Connect a resistor from this node to
VTX to set transmit gain. Gain shaping for termination impedance with a
COMBO I codec is also achieved with a network from this node to VTX.
O ac Output Voltage. Output of internal AX amplifier. The voltage at this pin
is directly proportional to the differential tip/ring current.
I ac/dc Separation. Input to internal AAC amplifier. Connect a 0.1 µF capac-
itor from this pin to VTX.
10
Agere Systems Inc.
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