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| 型號(hào)： | L9215A |
| 廠商： | Lineage Power |
| 英文描述： | Short-Loop Sine Wave Ringing SLIC(短環(huán)路正弦波振鈴用戶接口（SLIC）) |
| 中文描述： | 短回路正弦波振鈴用戶接口（短環(huán)路正弦波振鈴用戶接口電路（SLIC）） |
| 文件頁(yè)數(shù)： | 28/46頁(yè) |
| 文件大?。?/td> | 1165K |
| 代理商： | L9215A |
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Advance Data Sheet
October 2000
Short-Loop Sine Wave Ringing SLIC
L9215A/G
28
Lucent Technologies Inc.
Supervision
(continued)
Power Ring
(continued)
Sine Wave Input Signal and Sine Wave Power Ring
Signal Output
(continued)
The point at which clipping of the power ring signal
begins at tip and ring is a function of the battery volt-
age, the input capacitor at RING
IN
, and the input signal
at RING
IN
and Vcc. Typical characteristic conditions
showing the onset of clipping are given below.
Table 16. Onset of Power Ringing Clipping
V
CC
= 5 V, Cinput = 0.47
μ
F
Table 17. Onset of Power Ringing Clipping
V
CC
= 3.1 V, Cinput = 0.47
μ
F
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 cer-
tain timing considerations that should be made with
respect to state changes which are detailed in the
application note Switching Behavior of L9215 Ringing
SLIC.
PWM Input Signal and Sine Wave Power Ring Sig-
nal 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 below. This approach gives a sine
wave output at tip and ring.
12-3578F
Figure 12. Sine Wave Signal Providing Ringing
Input to RING
IN
Modulation waveforms showing PWM are in Figure 13
below.
Figure 13. Modulation Waveforms
Input
T/R
V
BAT1
(V)
–
70.15
–
68.06
–
66.00
–
64.08
–
62.04
–
60.05
Vrms (mV)
891
858
833
814
789
747
Vrms (V)
46.88
45.11
43.69
42.57
41.21
39.11
Gain
52.62
52.58
52.45
52.30
52.23
52.36
Input
T/R
V
BAT1
(V)
–70.12
–68.07
–66.06
–64.01
–62.00
–60.00
Vrms (mV)
894
855
824
799
780
749
Vrms (V)
47.15
45.11
43.38
41.95
40.79
39.09
Gain
52.74
52.76
52.65
52.5
52.29
52.19
12-3381(F)
A. Upper = Pwm Signal Centered at 10 kHz
Lower = Modulation Signal
12-3380(F)
B. Same as A but Expanded
PWM
IN
R
1
10 k
C
1
0.22
μ
F
C
2
0.47
μ
F
RING
IN
L9215
100 k
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