L9216B/H
High-Voltage Ringing SLIC with Ground Start
Preliminary Data Sheet
September 2001
Pin Information
NSTAT
RCVN
RCVP
VITR
VTX
27
ITR
26
25
24
23
L9216
28-PIN PLCC
22
21
20
13
V
CC
14
V
BAT1
15
V
BAT2
16
BGND
17
RGDET
19
18
ICM
B0
B1
B2
PR
PT
FB1
FB2
TXI
28
4
RING
IN
DCOUT
V
PROG
CF2
CF1
RTFLT
V
REF
5
6
7
8
9
10
11
12
AGND
3
2
1
12-3558.d (F)
Figure 2. 28-Pin PLCC
Table 1. Pin Descriptions
Pin
1
2
3
4
5
Symbol
NSTAT
VITR
RCVP
RCVN
RING
IN
Type
Name/Function
O
Loop Closure Detector Output—Ring Trip Detector Output.
When low, this
logic output indicates that an off-hook condition exists or ringing is tripped.
O
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.
I
Receive ac Signal Input (Noninverting).
This high-impedance input controls
the ac differential voltage on tip and ring. This node is a floating input.
I
Receive ac Signal Input (Inverting).
This high-impedance input controls the 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 factor low-
voltage ring signal. The input here is amplified to provide the full power ring sig-
nal at tip and ring. This signal may be applied continuously, even during nonring-
ing states.
O
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.
I
Current-Limit Program Input.
Connect ground to this pin to set current limit to
25 mA, float to this pin to set current limit to 40 mA.
—
Filter Capacitor.
Connect a capacitor from this node to ground.
—
Filter Capacitor.
Connect a capacitor from this node to CF2.
—
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.
O
SLIC Internal Reference Voltage.
Output of internal 1.5 V reference voltage.
GND
Analog Signal Ground.
PWR
Analog Power Supply.
User choice of 5 V or 3.3 V nominal power or supply.
PWR
Battery Supply 1.
High-voltage battery.
PWR
Battery Supply 2.
Lower-voltage battery.
GND
Battery Ground.
Ground return for the battery supplies.
6
DCOUT
7
8
9
10
V
PROG
CF2
CF1
RTFLT
11
12
13
14
15
16
V
REF
AGND
V
CC
V
BAT1
V
BAT2
BGND
8
Agere Systems Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
