參數(shù)資料
型號(hào)： PEF2445N
英文描述： ?Multipoint Switching and Conferencing Unit - Attenuation?
中文描述： ？多點(diǎn)交換和會(huì)議股-衰減？
文件頁(yè)數(shù)： 36/73頁(yè)
文件大?。?/td> 1618K
代理商： PEF2445N
PEB 2466
PEF 2466
Interface Description
Hardware Reference Manual
27
2001-02-20
5
Interface Description
The SICOFI
4-μC provides four interfaces:
Analog Interface,
PCM Interface,
Signaling Interface, and
Serial Microcontroller Interface.
A general description of these interface is given in the
Product Overview
, Chapter 4
.
Refer to the
Programmers Reference Manual
for information on the configuration and
operation of the four interfaces.
The subsequent chapters in this manual explain how to connect the SICOFI
4-μC to
subscriber line interface circuits (SLICs), microcontrollers, and PCM highways.
5.1
Analog Interface
The Analog Interface in combination with a Subscriber Line Interface Circuit (SLIC)
forms a configurable tip & ring (t/r) telephone line. The AC transmission characteristic of
the SICOFI
4-μC
—
SLIC combination can be controlled by programming the digital filter
structures inside the SICOFI
4-μC. The correct filter coefficients are determined by the
targeted AC transmission behavior (e.g. Telco specification) and by the transfer
functions of the SLIC.
The SICOFI
4-μC can be interfaced directly to electronic SLICs or transformer solutions.
The high driving capability of up to 300 Ohms eliminates the need for an external
amplifier that is normally used with transformer SLICs.
The peak amplitude of the analog inputs and outputs is at 2.223 V (overload point).
Out-of-band signals applied to the analog inputs are suppressed by the on-chip digital
hardware filters. The poles of these filters are fixed at 12 kHz and 16 kHz which
suppresses the echo signal from teletax pulses very efficiently: As long as the amplitude
of the teletax echo stays below the overload threshold of 2.223 Vp (1.57 Vrms), the voice
signal in the transmit path will not be disturbed. Thus, the on-chip hardware filters can
eliminate the need for external teletax filters.
5.1.1
Coupling Capacitors at the Analog Interface
A coupling capacitor >39 nF must be used on the
V
IN
-pins in the transmit direction. The
required value for the coupling capacitor on the
V
OUT
-pins depends on the input
resistance of the SLIC-circuitry (
R
Load
). It has to be chosen to fulfil the frequency
response requirement in the receive direction.
Figure 16
can be used to determine an
appropriate value for the coupling capacitor (
C
Ext1
).
相關(guān)PDF資料
PDF描述
PEF24622 ?SOCRATES-4?
PEF2466-H A-Law/u-Law CODEC
PEF24901 ISDN LINE INTERFACE|BASIC|CMOS|QFP|64PIN|PLASTIC
PEF24901H ?Quad ISDN Echocancellation Circuit Digital Front-End for 4B3T Line Code?
PEF24902 ISDN Line Interface
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PEF24470HV1.3 制造商:Rochester Electronics LLC 功能描述:- Bulk
PEF24471EV1.3 制造商:Lantiq 功能描述: 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Infineon Technologies AG 功能描述:
PEF24471EV1.3-G 功能描述:網(wǎng)絡(luò)控制器與處理器 IC T/E RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
PEF24471E-V12 制造商:Infineon Technologies AG 功能描述:
PEF24622 制造商:未知廠家 制造商全稱:未知廠家 功能描述:?SOCRATES-4?
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*