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參數(shù)資料
| 型號： | L3235N |
| 英文描述： | HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS |
| 中文描述： | 高度集成的用戶接口盒針對交換機與關鍵系統(tǒng)應用 |
| 文件頁數(shù)： | 16/25頁 |
| 文件大?。?/td> | 3164K |
| 代理商： | L3235N |
External components list for L3235N
To set the SLIC into operation the following parameters have to be defined:
- The AC SLIC impedance at line terminals "Zs" to which the return loss measurements is referred. It can
be real (typ. 600
) or complex.
- The equivalent AC impedance of the line "Zl" used for evaluation of the trans-hybrid loss performance
(2/4 wire conversion). It is usually a complex impedance.
- The value of the two protection resistors Rp in series with the line termination.
Once, the above parameters are defined, it is possible to calculate all the external components using 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%
Negative Battery
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
= 12.5
(2R
P
)
Z
AC
= 12.5
(Z
S
- 2R
P
)
R
PC
Z
AC
C
C
1250
1%
6250
1%
470pF 20%
R
P
insertion loss compensation
2W AC Impedance programmation
AC Feedback compensation
f1 = 300KHz C
C
=
1
2
π
f1
25R
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 protection purposes the RP resistor is usually splitted in two part R
and R
, with R
> 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 be used. Depending on application enviroment an heatsink could be necessary.
L3234 - L3235N
16/25
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