L9215A/G
Short-Loop Sine Wave Ringing SLIC
Data Sheet
September 2001
Pin Information (continued)
Table 1. Pin Descriptions
32-Pin
PLCC
48-Pin
MLCC
Symbol Type
Name/Function
1
43
NSTAT
NC
O
Loop Closure Detector Output—Ring Trip Detector Output. When
low, this logic output indicates that an off-hook condition exists or ring-
ing is tripped.
2
3, 4, 8, 11,
14, 17, 18,
21, 27, 28,
30, 32, 37,
39, 42, 44, 46
—
No Connection.
3
4
5
6
45
47
48
1
VITR
RCVP
RCVN
RINGIN
O
I
Transmit ac Output Voltage. Output of internal AAC amplifier. This
output is a voltage that is directly proportional to the differential ac tip/
ring current.
Receive ac Signal Input (Noninverting). This high-impedance input
controls to ac differential voltage on tip and ring. This node is a floating
input.
I
Receive ac Signal Input (Inverting). This high-impedance input con-
trols to ac differential voltage on tip and ring. This node is a floating
input.
I
Power Ring Signal Input. ac-couple to a sine wave or lower crest fac-
tor low-voltage ring signal. The input here is amplified to provide the
full-power ring signal at tip and ring. This signal may be applied contin-
uously, even during nonringing states.
7
8
2
5
PPMIN
OVH
I
I
Receive PPM Signal Input. ac-couple to a 12 kHz or 16 kHz PPM sig-
nal. The input here is amplified to provide the differential PPM voltage
on tip and ring. This signal may be applied continuously, even during
non-PPM modes.
Overhead Voltage Program Input. Connect a voltage source to this
point to program the overhead voltage. Voltage source may be external
or derived via a resistor divider from VREF. A programmable external
voltage source may be used to provide software control of the over-
head voltage. If a resistor or voltage source is not connected, the over-
head voltage will default to a nominal 6.0 V. If the default overhead is
desired, connect this pin to ground.
9
6
7
DCOUT
VPROG
O
I
dc Output Voltage. This output is a voltage that is directly proportional
to the absolute value of the differential tip/ring current. This is used to
set ring trip threshold.
10
Current-Limit Program Input. Connect a voltage source to this point
to program the dc current limit. Voltage source may be external or
derived via a resistor divider from VREF. A programmable external volt-
age source may be used to provide software control of the current limit.
11
12
13
9
CF2
CF1
—
—
—
Filter Capacitor. Connect a capacitor from this node to ground.
Filter Capacitor. Connect a capacitor from this node to CF2.
10
12
RTFLT
Ring Trip Filter. Connect this lead to DCOUT via a resistor and to
AGND with a capacitor to filter the ring trip circuit to prevent spurious
responses. A single-pole filter is needed.
14
13
VREF
O
SLIC Internal Reference Voltage. Output of internal 1.5 V reference
voltage.
Agere Systems Inc.
9
AGERE [ AGERE SYSTEMS ]
