參數(shù)資料
型號(hào)： AM79212
廠商： Electronic Theatre Controls, Inc.
英文描述： Advanced Subscriber Line Interface Circuit
中文描述： 高級(jí)用戶(hù)線接口電路
文件頁(yè)數(shù)： 38/48頁(yè)
文件大小： 501K
代理商： AM79212
38
Am79213/Am79C203/031 Data Sheet
Table 10. User-Programmable Components
Z
T
is connected between the VTX and RSN pins. The fuse re-
sistors are R
F
. Z
2WIN
is the desired 2-wire AC input imped-
ance. 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 VRX to RSN. Z
T
is defined above, and
G
42L
is the desired receive gain.
Thermal Management Equations (Normal Active and Tip Open States)
R
TMG
is connected from TMG to VBAT and is used to reduce
power dissipation within the ASLIC device in normal Active
and Tip Open states.
Power dissipated in the thermal management resistor, R
TMG
,
during normal Active and Tip Open states
Power dissipated in the ASLIC device while in normal Active
and Tip Open states
Thermal Management equations (Polarity Reverse State)
Note: ASLIC device die temperature should not exceed 140
°
C.
Power dissipated in the ASLIC device while in the Polarity
Reverse state
Total die temperature
Thermal impedance of the 32-pin plastic leaded chip carrier
package
Z
T
63.5
Z
2WIN
2R
F
–
(
)
=
Z
RX
Z
G
42L
-----------
254
Z
Z
L
Z
T
63.5
2R
F
+
(
)
+
--------------------------------------------------------
=
R
TMG
V
------------------------------------
VOFF
–
I
LOOP
=
P
RTMG
V
-----------------------------------------------------------------------------------
VOFF
–
I
R
(
)
–
(
)
2
R
TMG
=
P
SLIC
V
BAT
I
LOOP
P
RTMG
–
R
L
I
LOOP
(
)
2
–
0.12 W
+
=
P
SLIC
V
BAT
I
LOOP
R
L
I
LOOP
(
)
2
(
)
–
0.12 W
+
=
T
SLIC
P
SLIC
θ
jA
T
AMBIENT
+
=
ThetajA
θ
jA
(
)
43
°
watt
=
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