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參數(shù)資料
| 型號： | L9214A |
| 廠商： | Lineage Power |
| 英文描述： | Low-Cost Ringing SLIC(低價格振鈴用戶環(huán)路接口電路) |
| 中文描述： | 低成本振鈴用戶接口（低價格振鈴用戶環(huán)路接口電路） |
| 文件頁數(shù)： | 27/44頁 |
| 文件大?。?/td> | 964K |
| 代理商： | L9214A |
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Preliminary Data Sheet
October 2000
Low-Cost Ringing SLIC
L9214A/G
Lucent Technologies Inc.
27
Supervision
(continued)
Power Ring
(continued)
The ring signal will appear balanced on tip and ring.
That is, the ring signal is applied on both tip and ring,
with the signal on tip 180
°
out of phase from the signal
on ring. This operation is shown in Figure 11 below.
Ringing loop range is calculated as follows:
V
RINGLOAD
= {(V
BATTERY
– 4)/Crest Factor} *
{R
LOAD
/(R
LOAD
+ R
LOOP
+ 2 x R
PROTECTION
)}
As a practical example, calculate the maximum dc loop
length, assuming the following conditions:
Minimum required ring voltage = 40 Vrms
V
BATTERY
= –67 V
Trapezoidal ringing, crest factor = 1.2
Protection resistors = 30
each
Ring Load = 2 North American REN = 3500
+ 16
μ
F
Ringing frequency = 25 Hz
First, calculate the equivalent ringing load resistance at
25 Hz.
R
LOAD
= {(3500
)
2
+ (2 *
π
* 25 * 16E–6)
–2
}
0.5
R
LOAD
= 3522
40 Vrms = {(67 – 4)/1.2)} {3522
/(R
LOOP
+ 3522
+
60
)}
R
LOOP
= 1040
Effects such as power supply tolerance and crest fac-
tor tolerance can affect this calculation.
Crest factor is estimated by the formula:
Where:
f = ringing frequency; C
FB
= (C
FB1
+ C
FB2
)/2;
Ics = 30
μ
A with B3 = 1 and 90
μ
A with B3 = 0;
V
OHH
= 4 V
1
I
CS
×
-----------------------------------------------------------------------------------------
3
–
-------------------------------------------------------------------------------------------------------
=
12-3532.B (F)
Figure 11. Ring Operation
GND
V
BAT
RING
LOAD
1/2 R
LOOP
+ R
PROTECTION
1/2 R
LOOP
+ R
PROTECTION
PT
+1
PR
B1
SQUARE WAVE OR
PWM SIGNAL
L9214
V
TIP
V
RING
–1
3 V
1 V
相關PDF資料 |
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|---|---|
| L9214G | Low-Cost Ringing SLIC(低價格振鈴用戶環(huán)路接口電路) |
| L9215G | Short-Loop Sine Wave Ringing SLIC(短環(huán)路正弦波振鈴用戶接口（SLIC）) |
| L9215A | Short-Loop Sine Wave Ringing SLIC(短環(huán)路正弦波振鈴用戶接口（SLIC）) |
| L9216A | Short-Loop Ringing SLIC with Ground Start(接地起動的短環(huán)路振鈴用戶接口) |
| L9216G | Short-Loop Ringing SLIC with Ground Start(接地起動的短環(huán)路振鈴用戶接口) |
相關代理商/技術參數(shù) |
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|---|---|
| L9215A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Short-Loop Sine Wave Ringing SLIC |
| L9216A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Short-Loop Ringing SLIC with Ground Start |
| L9217A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and PPM |
| L9218A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
| L9219A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and Dual Current Limit |
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