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參數(shù)資料
| 型號： | L3845B |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TRUNK INTERFACE |
| 中文描述： | 中繼接口 |
| 文件頁數(shù)： | 3/7頁 |
| 文件大?。?/td> | 57K |
| 代理商： | L3845B |
DC ELECTRICAL CHARACTERISTICS
(I
L
= 10 mA to 100 mA, R
1
= 56
, S
1
= Open, T
amb
= + 25
°
C,
unless otherwisespecified)
Symbol
V
L
Parameter
Test Condition
PULSE = Open
IL = 10 mA
I
L
= 20 mA
I
L
= 100 mA
PULSE = V
–
I
L
= 20 mA
I
L
= 35 mA
I
L
= 80 mA
Min.
Typ.
Max.
Unit
Line Voltage
(normal mode)
5
6
12
V
V
V
V
LP
Line Voltage
(pulse mode)
4
5.5
9.5
9.5
V
V
V
I
hn
ON/OFF-Hook
Line Current Detection
Threshold
OFF/ON-Hook
Line Current Detection
Threshold
OFF-Hook
Output Drive Current at Pin
HDO
Pulse Input Low Voltage
Pull-up Input Current at Pin
PULSE (pulse mode)
Imput Current at Pin Pulse
(normal mode)
6.5
mA
I
hf
5
9.2
mA
I
OUT
IL = 10 mA
I
L
≥
20 mA
1.5
2
mA
mA
V
PM
I
PM
0.8
20
V
μ
A
IL = 100 mA
Pulse = V
–
I
NM
3
μ
A
AC ELECTRICAL CHARACTERISTICS
(I
L
= 10mA to 100mA, R
1
= 56
, R
2
= 470K
, R
3
= 130 K
,
T
amb
= + 25
°
C, unlessotherwise specified)
Symbol
Z
L
Parameter
Test Condition
S
1
= Open, S
2
= Open
C
1
= 2.2mF
f = 1KHz
S
1
= Open, S
2
= Open
f = 1KHz
V
AC-L
= 775mVrms
I
L
= 15 to 100mA
S
1
= Closed; S
2
= Open
V
AC-L
= 1.3Vrms
S
1
= Open; S
2
= Closed
V
AC-L
= 1.9Vrms
Min.
Typ.
Max.
Unit
AC Line Impedance
20
K
Sending/Receiving Distortion
2
%
Sending/Receiving Distortion
2
%
%
Sending/Receiving Distortion
2(*)
(*) Not tested,guaranteed only by design.
APPLICATION INFORMATION
With the use of this circuit it is possible to termi-
nate an analog trunk so that all the DC current
component is flowing in the TRUNK TERMINA-
TION CIRCUIT while the AC component is de-
coupled with a low voltage capacitor and can be
used with a small and low cost audio coupler
transformer to provide the AC balancing termina-
tionand two to four wire conversion.
Therefore it is usefull both for MODEM and PABX
systems.
Figure 1 gives the typical application circuit ; it is
worth to note that the TRUNK TERMINATION
CIRCUIT, togetherwith the LS5018transient sup-
pressor provides a compact and low cost module
fully protected against lightning or overvoltages
frequentlypresenton telephonelines.
The PULSE input when connected to V- allows
the device to reduce the Line Voltage and to
show a resistive impedance equal to R1 to the
line. When PULSE input is left open, this function
is disable.
L3845
3/7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L3845B1 | 制造商:STMicroelectronics 功能描述:3845B1 |
| L3845D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TRUNK INTERFACE |
| L3845D1 | 功能描述:電信集成電路 Analog Trunk Intrfc 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 |
| L3845D1013TR | 功能描述:電信集成電路 Analog Trunk Intrfc 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 |
| L38512-ADJ | 制造商:Texas Instruments 功能描述: |
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