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參數資料
| 型號： | LE79555-2VC |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數： | 11/16頁 |
| 文件大小： | 411K |
| 代理商： | LE79555-2VC |
SLIC Products
11
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 VRX to RSN. 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 R
DC
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 R
D
to AGND/
DGND and I
T
is the threshold current between on hook and
off hook.
C
CAS
is the regulator filter capacitor and f
c
is the desired filter
cut-off frequency.
Standby loop current (resistive region).
Z
T
250
Z
2WIN
(
2
R
F
–
)
=
Z
RX
Z
G
42L
------------
500
Z
250
Z
L
(
Z
T
2
R
F
+
)
+
---------------------------------------------------
=
R
DC1
R
DC2
I
LOOP
---------------
=
+
C
DC
1.5 ms
R
R
DC1
R
DC2
--------------+
=
RD
ON
I
T
---------
RD
OFF
I
T
---------
C
D
R
D
0.5 ms
=
,
=
,
=
C
CAS
105
π
f
c
3.4
--------------1
=
I
STANDBY
V
400
3 V
–
R
L
+
---------------------------------
=
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