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參數資料
| 型號： | L3845D |
| 廠商： | 意法半導體 |
| 英文描述： | TRUNK INTERFACE |
| 中文描述： | 中繼接口 |
| 文件頁數： | 1/7頁 |
| 文件大小： | 57K |
| 代理商： | L3845D |
L3845
TRUNK INTERFACE
ON CHIP POLARITYGUARD
MEETS DC LINE CHARACTERISTICS OF
EITHER CCITT AND EIA RS 464 SPECS
PULSE FUNCTION
HIGH AC IMPEDANCE
OFF HOOK-STATUS DETECTION OUTPUT
LOW EXTERNAL COMPONENT COUNT
DESCRIPTION
The circuit provides DC loop termination for ana-
log trunklines.
The V-I characteristics is equivalent to a fixed
voltage drop (zener like characteristic) in series
with an external resistance that determines the
slope of the DC characteristic.
An external low voltage electrolytic capacitor
causes the circuit to exhibit a very high imped-
ance to all AC signal above a minimum frequency
that is determinedby the capacitor itself and by a
20 K nominalresistor integratedon the chip.
The Off-Hook status is detected all the time a
typicof 8 mA is flowinginto the circuit. In this con-
dition a constant current generator is activated to
supply an external device (typically an optocou-
pler) without affecting the AC characteristic of the
circuit.
When Pulse Dialing is required the PULSE input
(pin 3) connected to V- causes the device to re-
duce the fixed DC voltage drop and to exhibit a
pure resistive impedanceequal to the external re-
sistor.
This is advanced information on a new product now indevelopment or undergoingevaluation. Details are subject to change without notice.
June 1996
POLARITY
GUARD
DC
LINE
TERMINATION
OF
HOOK
DETECTION
CIRCUIT
1
7
8
3
4
IN1
IN2
5
6
2
ACT
R2
DCT
V-
R3
R1
S1
C1
S2
V+
PULSE
HD0
D96TL263
BLOCK DIAGRAM
Minidip
SO8
ORDERING NUMBERS:
L3845B
L3845D
1/7
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相關代理商/技術參數 |
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| 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 安裝風格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray |
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