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AM79574-2JC Scheda tecnica(PDF) 11 Page - Advanced Micro Devices

Il numero della parte AM79574-2JC
Spiegazioni elettronici  Subscriber Line Interface Circuit
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Produttore elettronici  AMD [Advanced Micro Devices]
Homepage  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79574-2JC Scheda tecnica(HTML) 11 Page - Advanced Micro Devices

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SLIC Products
11
11. Assumes the following ZT network:
12. Tested with 0
Ω source impedance. 2 MΩ is specified for system design purposes only.
13. Group delay can be considerably reduced by using a ZT network such as that shown in Note 11 above. The network reduces
the group delay to less than 2
µs. The effect of group delay on linecard performance may be compensated for by using
QSLAC™ or DSLAC™ devices.
Note:
*
A logic Low on E0 disables the DET output into the Open Collector state.
Table 1.
SLIC Decoding
DET Output
State
C3 C2 C1
Two-Wire Status
E0 = 1*
E1 = 0
E0 = 1*
E1 = 1
0
0
0
0
Open Circuit
Ring trip
Ring trip
1
0
0
1
Ringing
Ring trip
Ring trip
2
0
1
0
Active
Loop detector
Ground key
3
0
1
1
On-hook TX (OHT)
Loop detector
Ground key
4
1
0
0
Tip Open
Loop detector
5
1
0
1
Reserved
Loop detector
6
1
1
0
Active Polarity Reversal
Loop detector
Ground key
7
1
1
1
OHT Polarity Reversal
Loop detector
Ground key
Table 2.
User-Programmable Components
ZT is connected between the VTX and RSN pins. The fuse
resistors are RF, and Z2WIN is the desired 2-wire AC input
impedance. When computing ZT, the internal current
amplifier pole and any external stray capacitance between
VTX and RSN must be taken into account.
ZRX is connected from VRX to the RSN pin, ZT is defined
above, and G42L is the desired receive gain.
RDC1, RDC2, and CDC form the network connected to the
RDC pin. RDC1 and RDC2 are approximately equal.
RD and CD form the network connected from RD to –5 V and
IT is the threshold current between on hook and off hook.
VTX
RSN
300 k
300 k
30 pF
Z
T
1000 Z
2WIN
2R
F
()
=
Z
RX
Z
L
G
42L
-----------
1000
Z
T
Z
T
1000 Z
L
2R
F
+
()
+
----------------------------------------------------
=
R
DC 1
R
DC2
50 R
FEED
2R
F
()
=
+
C
DC
1.5 ms
R
DC1
R
DC 2
+
R
DC 1
R
DC2
--------------------------------
=
R
D
365
I
T
---------
C
D
0.5 ms
R
D
------------------
=
,
=


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