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AM7945JC Datasheet(PDF) 11 Page - Advanced Micro Devices

Part # AM7945JC
Description  Subscriber Line Interface Circuit
PDF  18 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM7945JC Datasheet(HTML) 11 Page - Advanced Micro Devices

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SLIC Products
11
Note:
E0 High enables DET.
Table 1.
SLIC Decoding
DET Output
State
C3 C2 C1
2-Wire Status
E1 = 1
E1 = 0
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
Ground key
5
1
0
1
Standby
Loop detector
Ground key
6
110
Reserved
7
111
Reserved
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 RSN. 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. ILOOP is the
desired loop current in the constant-current region.
RD and CD form the network connected from RD to –5 V and
IT is the threshold current between on hook and off hook.
OHT loop current (constant-current region).
CCAS is the regulator filter capacitor and fc is the desired filter
cutoff frequency.
Thermal Management Equations (Normal Active and Tip Open States)
RTMG is connected from TMG to VBAT and is used to limit power
dissipation within the SLIC in Normal Active and Tip Open
states only.
Power dissipated in the TMG resistor, RTMG, during Active and
Tip Open states.
Power dissipated in the SLIC while in Active and Tip Open
states.
Z
T
200 Z
2W IN
2R
F
–
()
=
Z
RX
Z
L
G
42L
-----------
200
Z
T
•
Z
T
200 Z
L
2R
F
•
+
()
+
-------------------------------------------------------
•
=
R
DC 1
R
DC2
500
I
LOOP
--------------
=
+
C
DC
1.5 ms
R
DC1
R
DC2
+
R
DC1
R
DC2
•
--------------------------------
•
=
R
D
375
I
T
---------
C
D
0.5 ms
R
D
-----------------
=
,
=
I
OHT
500 V
0.66
•
R
DC 1
R
DC2
+
--------------------------------
=
C
CAS
1
3.4
10
5πf
c
•
-----------------------------
=
R
TMG
V
BAT
6V
–
I
LOOP
--------------------------------
≥
P
RTM G
V
BAT
6 V
–
I
L
R
L
•
()
2
–
R
TMG
--------------------------------------------------------------
=
P
SLIC
V
BAT
I
L
P
RTMG
R
L IL
()
2
–
()
–
•
0.12 W
+
=



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