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參數(shù)資料
| 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)： | 30/46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
30
Lucent Technologies Inc.
Supervision
(continued)
Power Ring
(continued)
Square Wave Input Signal and Trapezoidal Power
Ring Signal Output
A low-voltage square wave signal may be used to pro-
vide 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 18. This approach gives a trapezoidal
wave output at tip and ring.
12-3579F
Figure 18. Low-Voltage Square Wave Signal Provid-
ing Ringing Input to RING
IN
Using this approach, a trapezoidal waveform can be
achieved at tip and ring. This has the advantage of
increasing the power transfer to the load for a given
battery voltage, thus increasing the effective ringing
loop length as compared to a sine wave. The actual
crest factor achieved is a function of the magnitude of
the battery, the magnitude of the input voltage, fre-
quency, and R
1
. It is recommended to use the C
2
and
C
1
values shown in Figure 18. Figure 19 shows actual
results with a given set of conditions.
12-3572F
Notes:
CH1 – CMOS Input (5 V) at RING
IN
CH2 – Filtered input at RING
IN
CH3 – Tip
CH4 – Ring
R
1
= 14 k
, C
1
= 1.0
μ
F, C
2
= 0.47
μ
F
V
BAT1
= –70 V,
Vrms
= 51 V, V
pp
= 67 V, frequency = 20 Hz,
Crest
Factor = 1.3
Figure 19. Square Wave Input Signal and Trapezoi-
dal Power Ring Signal Output
SQUARE
WAVE
R
1
14 k
C
1
1.0
μ
F
C
2
0.47
μ
F
RING
IN
L9215
100 k
IN
CH1
CH2
CH3
CH4
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