L9215A/G
Short-Loop Sine Wave Ringing SLIC
Data Sheet
September 2001
Pin Information (continued)
Table 1. Pin Descriptions (continued)
32-Pin 48-Pin Symbol Type
PLCC MLCC
Name/Function
15
16
15
16
AGND
VCC
GND Analog Signal Ground.
PWR Analog Power Supply. User choice of 5 V or 3.3 V nominal power or sup-
ply.
17
18
19
20
19
20
22
23
VBAT1
VBAT2
PWR Battery Supply 1. High-voltage battery.
PWR Battery Supply 2. Lower-voltage battery.
GND Battery Ground. Ground return for the battery supplies.
BGND
TRGDET
O
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.
21
22
23
24
25
24
25
26
29
31
ICM
FB2
FB1
PT
I
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.
I/O 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.
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 overcurrent pro-
tection.
Iu
26
27
28
29
30
33
34
35
36
38
B2
B1
State Control Input. These pins have an internal 60 kΩ pull-up.
B0
BR
ITR
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.
31
32
40
41
VTX
TXI
O
I
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 µF capac-
itor from this pin to VTX.
10
Agere Systems Inc.
AGERE [ AGERE SYSTEMS ]
