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參數(shù)資料
| 型號： | AM7945 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Subscriber Line Interface Circuit |
| 中文描述： | 用戶線接口電路 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 157K |
| 代理商： | AM7945 |
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
1
1
0
Reserved
7
1
1
1
Reserved
Table 2.
User-Programmable Components
Z
T
is connected between the VTX and RSN pins. The fuse
resistors are R
F
, and Z
2WIN
is the desired 2-wire AC input
impedance. When computing Z
T
, the internal current amplifier
pole and any external stray capacitance between VTX and
RSN must be taken into account.
Z
RX
is connected from V
RX
to R
SN
. Z
T
is defined above, and
G
42L
is the desired receive gain.
R
DC1
, R
DC2
, and C
DC
form the network connected to the RDC
pin. R
DC1
and R
DC2
are approximately equal. I
LOOP
is the
desired loop current in the constant-current region.
R
D
and C
D
form the network connected from RD to
–
5 V and
I
T
is the threshold current between on hook and off hook.
OHT loop current (constant-current region).
C
CAS
is the regulator filter capacitor and f
c
is the desired filter
cutoff frequency.
Thermal Management Equations (Normal Active and Tip Open States)
R
TMG
is connected from T
MG
to V
BAT
and is used to limit power
dissipation within the SLIC in Normal Active and Tip Open
states only.
Power dissipated in the T
MG
resistor, R
TMG
, during Active and
Tip Open states.
Power dissipated in the SLIC while in Active and Tip Open
states.
Z
T
200 Z
2WIN
2R
F
–
)
=
Z
RX
Z
G
42L
-----------
200
200 Z
L
+
Z
T
2
R
F
)
+
------------------------------------------------------
=
R
DC1
R
DC2
I
LOOP
-------------
=
+
C
DC
1.5 ms
R
R
DC1
R
DC2
-------------------------------
=
R
D
I
T
R
DC1
--------
C
D
R
D
R
DC2
----------------
=
,
=
I
OHT
+
-------------------------------
=
C
CAS
10
5
π
f
c
3.4
-----------------------------
=
R
TMG
V
-------------------------------
6 V
–
I
LOOP
≥
P
RTMG
V
-------------------------------------------------------------
6 V
R
TMG
)
2
=
P
SLIC
V
BAT
I
L
P
RTMG
R
L
I
L
(
)
2
–
(
)
–
0.12 W
+
=
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| AM79489 | SUBSCRIBER LINE INTERFACE CIRCUIT |
| AM79489-1JC | SUBSCRIBER LINE INTERFACE CIRCUIT |
| AM79489-2JC | SUBSCRIBER LINE INTERFACE CIRCUIT |
| AM79489-3JC | SUBSCRIBER LINE INTERFACE CIRCUIT |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AM7945JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| AM7946-1JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Interface Circuit |
| AM7946-2JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| AM7946-3JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Interface Circuit |
| AM7946-4JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Interface Circuit |
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