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AM79R70JC Datasheet(PDF) 13 Page - Advanced Micro Devices

No. de pieza AM79R70JC
Descripción Electrónicos  Ringing Subscriber Line Interface Circuit
PDF  20 Pages
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Fabricante Electrónico  AMD [Advanced Micro Devices]
Página de inicio  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79R70JC Datasheet(HTML) 13 Page - Advanced Micro Devices

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SLIC Products
13
RING-TRIP COMPONENTS
where RLRT = Loop-detection threshold resistance for ring trip and CF = Crest factor of ringing signal (≈ 1.25)
RSLEW, CSLEW
Ring waveform rise time
≈ 0.214 • (RSLEW • CSLEW) ≈ tr.
For a 1.25 crest factor @ 20 Hz, tr
≈ 10 mS.
∴ (RSLEW = 150 kΩ, CSLEW = 0.33 µF.)
CSLEW should be changed if a different crest factor is desired.
R
RT2
12 k
Ω
=
C
RT
1.5
µF
=
R
RT1
320
CF
V
BAT1
Vbat
5
–
24
µA320 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 RSLEW)
A
B
IL
RSN
RDC
RDC2
RDC1
CDC
SLIC
RL
a
b
Feed current programmed by RDC1 and RDC2
Figure 3. Feed Programming



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