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L9215A Datasheet(PDF) 10 Page - Agere Systems

Part # L9215A
Description  Short-Loop Sine Wave Ringing SLIC
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Manufacturer  AGERE [Agere Systems]
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Data Sheet
September 2001
Short-Loop Sine Wave Ringing SLIC
L9215A/G
10
Agere Systems Inc.
Pin Information (continued)
Table 1. Pin Descriptions (continued)
32-Pin
PLCC
48-Pin
MLCC
Symbol
Type
Name/Function
15
15
AGND
GND Analog Signal Ground.
16
16
VCC
PWR Analog Power Supply. User choice of 5 V or 3.3 V nominal power or sup-
ply.
17
19
VBAT1
PWR Battery Supply 1. High-voltage battery.
18
20
VBAT2
PWR Battery Supply 2. Lower-voltage battery.
19
22
BGND
GND Battery Ground. Ground return for the battery supplies.
20
23
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
24
ICM
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.
22
25
FB2
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.
23
26
FB1
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.
24
29
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 overcurrent pro-
tection.
25
31
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.
26
33
B2
Iu
State Control Input. These pins have an internal 60 k
Ω pull-up.
27
34
B1
28
35
B0
29
36
BR
30
38
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
40
VTX
O
ac Output Voltage. Output of internal AX amplifier. The voltage at this pin
is directly proportional to the differential tip/ring current.
32
41
TXI
I
ac/dc Separation. Input to internal AAC amplifier. Connect a 0.1
µF capac-
itor from this pin to VTX.


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