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參數(shù)資料
| 型號： | AM79R70 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Ringing Subscriber Line Interface Circuit |
| 中文描述： | 振鈴用戶線接口電路 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 271K |
| 代理商： | AM79R70 |
P R E L I M I N A R Y
SLIC Products
13
RING-TRIP COMPONENTS
where R
LRT
= Loop-detection threshold resistance for ring trip and CF = Crest factor of ringing signal (
≈
1.25
)
R
SLEW
, C
SLEW
Ring waveform rise time
≈
0.214
(R
SLEW
C
SLEW
)
≈
tr.
For a 1.25 crest factor @ 20 Hz, tr
≈
10 mS.
∴
(R
SLEW
= 150 k
, C
SLEW
= 0.33
μ
F.)
C
SLEW
should be changed if a different crest factor is desired.
R
RT2
12 k
=
C
RT
1.5
μ
F
=
R
RT1
300
CF
V
300
Vbat
3.5
–
15
μ
A
CF
R
LRT
150
2R
F
+
+
(
)
(
)
–
-----------------------------------------------------------------------------------------------------------------------------------------
R
LRT
150
2R
F
+
+
(
)
=
0
A(TIP)
Battery
Figure 2. Ringing Waveforms
B(RING)
This is the best time for
switching between RINGING
and other states for minimizing
detect switching transients.
Ringing Reference
(Input to R
SLEW
)
A
B
I
L
RSN
RDC
R
DC2
R
DC1
C
DC
SLIC
R
L
a
b
Feed current programmed by R
DC1
and R
DC2
Figure 3. Feed Programming
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