am79574 Advanced Micro Devices, am79574 Datasheet - Page 11

• Manufacturer Part Number: am79574
• Description: Subscriber Line Interface Circuit
• Manufacturer: Advanced Micro Devices

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