參數(shù)資料
型號(hào)： LE57D111JC
英文描述： Telecommunication IC
中文描述： 通信集成電路
文件頁(yè)數(shù)： 12/22頁(yè)
文件大小： 546K
代理商： LE57D111JC
P R E L I M I N A R Y
12
Le57D11 Data Sheet
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 VRX to RSN. Z
T
is defined above, and G
42L
is
the desired receive gain.
I
LOOP
is the desired loop current in the constant-current region.
Loop detect threshold is typically 1/3 of programmed Loop current.
C
CAS
is the regulator filter capacitor and f
c
is the desired filter cut-off
frequency.
Standby loop current (resistive region).
Thermal Management Equations (Normal, Active, and Polarity Reverse States)
R
TMG
is connected from TMG to VBAT and limits power within the
SLIC in Active and Off-Hook states.
Power dissipated in the TMG resistor, R
TMG
during Active and Off-
Hook states.
Power dissipated in the SLIC while in Active state.
Z
T
166.7 Z
2WIN
2R
F
–
)
=
Z
RX
Z
G
42L
I
LOOP
------------
500Z
166.7 Z
L
Z
T
2R
F
+
)
+
--------------------------------------------------------
=
R
REF
---------------
=
C
DC
1.5
μ
F
=
C
CAS
105
π
f
c
3.4
-------------1
=
I
STANDBY
V
5000
R
L
+
-----------------------3 V
=
R
TMG
V
I
LOOP
6 V
–
--------------------------------
70
–
≥
P
RTMG
V
---------------------------------------------------------------------
6 V
–
I
R
(
)
–
(
)
2
R
TMG
70
+
(
)
2
R
TMG
=
P
SLIC
V
BAT
I
L
P
RTMG
–
R
L
I
( )
2
0.12 W
+
–
=
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