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參數(shù)資料
| 型號： | L3234T |
| 英文描述： | Telephone Ringer |
| 中文描述： | 電話鈴聲 |
| 文件頁數(shù)： | 17/26頁 |
| 文件大?。?/td> | 457K |
| 代理商： | L3234T |
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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 |
|---|---|
| L3235T | Subscriber Line Interface Circuit |
| L3234 | CAP CER 1.5UF 50V 20% X7R 1812 |
| L3235N | HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS |
| L3235 | CAP CER 1.5UF 100V 10% X7R 1812 |
| L34024 | Optoelectronic |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L3235 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS |
| L3235-D2 | 功能描述:射頻無線雜項(xiàng) SLIC PABX & Key Sys RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| L3235-D2/TR | 功能描述:電信集成電路 SLIC PABX & Key Sys RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray |
| L3235N | 功能描述:電信集成電路 SLIC PABX & Key Sys RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray |
| L3235N-TR | 制造商:STMicroelectronics 功能描述:SLIC 49DB 77MA 5V/100V 44TQFP - Tape and Reel |
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