Preliminary Data Sheet
September 2001
L9216B/H
High-Voltage Ringing SLIC with Ground Start
Supervision
(continued)
Power Ring
(continued)
Sine Wave Input Signal and Sine Wave Power Ring Signal Output
(continued)
During nonring modes, the sinusoidal ringing waveform may be left on at RING
IN
. Via the state table, the ring signal
will be removed from tip and ring even if the low-voltage input is still present at RING
IN
. There are certain timing
considerations that should be made with respect to state changes which are detailed in the
Switching Behavior of
L9215/6 Ringing SLIC
Application Note.
PWM Input Signal and Sine Wave Power Ring Signal Output
A pulse-width modulated (PWM) signal may be used to provide the ringing input to RING
IN
. The signal is applied
through a low-pass filter and ac-coupled into RING
IN
as shown in Figure 12 below. This approach gives a sine
wave output at tip and ring.
L9215/16
R
1
INPUT
C
1
C
2
RING
IN
12-3578bF
Figure 12. L9215/16 Ringing Input Circuit Selection Table for Square Wave and PWM Inputs
Table 23. Signal and Component Selection Chart
V
BAT
70 V
70 V
70 V
70 V
70 V
70 V
85 V
85 V
85 V
85 V
85 V
85 V
V
CC
5V
3V
5V
3V
5V
3V
5V
3V
5V
3V
5V
3V
Input
5 V Square
3 V Square
10 kHz PWM 5 V
10 kHz PWM 3 V
90 kHz PWM 5 V
90 kHz PWM 3 V
5 V Square
3 V Square
10 kHz PWM 5 V
10 kHz PWM 3 V
90 kHz PWM 5 V
90 kHz PWM 3 V
R1
12 kΩ
7 kΩ
10 kΩ
10 kΩ
7 kΩ
7 kΩ
10 kΩ
7 kΩ
10 kΩ
4 kΩ
4 kΩ
4 kΩ
C1
1
µF
1
µF
0.22
µF
0.22
µF
0.1
µF
0.1
µF
1
µF
1
µF
0.22
µF
0.22
µF
0.1
µF
0.1
µF
C2
0.47
µF
0.47
µF
0.47
µF
0.47
µF
0.47
µF
0.47
µF
0.47
µF
0.47
µF
0.47
µF
0.47
µF
0.47
µF
0.47
µF
CF
1.3
1.3
sine
sine
sine
sine
1.3
1.3
sine
sine
sine
sine
Typical 5 REN Ringing Voltage RMS
48 V
49 V
42 V
42 V
42 V
42 V
59 V
51 V
51 V
47 V
51 V
49 V
Agere Systems Inc.
27
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
