參數(shù)資料
型號： L3235T
英文描述： Subscriber Line Interface Circuit
中文描述： 用戶線接口電路
文件頁數(shù)： 17/26頁
文件大?。?/td> 457K
代理商： L3235T
External components list for L3235
To set the SLIC into operation the following parametershave to be defined:
- The AC SLIC impedance at line terminals ”Zs” to which the return loss measurementsis referred. It can
bereal (typ.600
) or complex.
- The equivalentAC impedanceof the line ”Zl” used for evaluationof the trans-hybridloss performance
(2/4 wireconversion).It is usually a compleximpedance.
- The value of the two protection resistors Rp inseries with the linetermination.
Once, the above parameters are defined,it is possible to calculateall the externalcomponentsusing the
following table. The typical values has been obtained supposing:Zs = 600
; Zl = 600
; Rp = 50
Name
R
F
C
F
R
GF
C
GF
R
R
R
LIM
Suggested Value
39K
390nF
39K
390nF
51K
8.4K
to 33K
Function
Formula
Delay Time
On-hook Off-hook
Delay Time
GK Detector
Bias Set
Ext. Current Limit. Progr.
τ
= 0.69
C
F
39K
(1)
τ
= 0.69
C
GF
39K
R
LIM
=
564
I
LIM
3mA
1
2
π
16K
fp
47 < R
P
< 100
(2)
CR
4.7
μ
F
6.3 V 30%
NegativeBattery
Filter
C
AC
=
R
P
R
T
C
AC
50
Protection Resistors
Termination Resistor
DC/AC current feedback splitting
1M
20%
100
μ
F
6.3V 20%
C
AC
=
1
2
π
220
f
sp
R
PC
= 25
(2R
P
)
Z
AC
= 25
(Z
S
- 2R
P
)
R
PC
Z
AC
C
C
2500
1%
12500
1%
220pF 20%
R
P
insertionloss compensation
2W AC Impedance programmation
AC Feedback compensation
f1 = 300KHz
C
C
=
1
2
π
f1
50R
P
Z
AS
R
AS
ZB
C
H
12500
1%
2500
1%
15K
1%
220pF 20%
Slic Impedance Balancing Net.
Z
AS
= 25
(Z
S
- 2R
P
)
RAS = 25
(2R
P
)
Z
B
= 25
Zl
C
H
= C
C
Z
AC
Line impedance Balancing Net.
C
C
Transybrid loss Compensation
Z
AS
1
C
TX
4.7
μ
F 30%
DC Decoupling Tx Output
C
TX
=
6.28
fp
Z
load
D1, D2
Text
1N4007
(3)
Line Rectifier
External Transistor
P
Diss
> 2W, V
CEO
> 60V
H
FE
> 40, I
C
> 100mA
V
BE
< 0.8V @ 100mA
CV
SS
; CV
DD
C
VB
100nF
100nF/100V
±
5V supply filter
V
BAT
supply filter
Notes:
1) For proper operation Cf should be selected in order to verify the following conditions:
A)cf > 150nF
B)
τ
< 1/2
f
f
: Ringing signal frequency
2) For protectionpurposes the RP resistor is usually splittedin twopart R
P1
and R
P2
, with R
P1
> 30
.
3) ex: BD140; MJE172; MJE350.... (SOT32 or SOT82 package available also for surface mount).For low power application (reduced battery
voltage) BCP53 (SOT223 surface mount package) can beused. Dependingon application enviromentan heatsinkcould be necessary.
L3234 - L3235
17/26
相關(guān)PDF資料
PDF描述
L3234 CAP CER 1.5UF 50V 20% X7R 1812
L3235N HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS
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