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參數(shù)資料
| 型號： | AM79R70SC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | Ringing Subscriber Line Interface Circuit |
| 中文描述： | TELECOM-SLIC, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 270K |
| 代理商： | AM79R70SC |
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
320
CF
V
320
Vbat
5
–
24
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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