參數(shù)資料
型號(hào)： LE79R251JC
英文描述： Telecommunication IC
中文描述： 通信集成電路
文件頁(yè)數(shù)： 3/22頁(yè)
文件大?。?/td> 533K
代理商： LE79R251JC
P R E L I M I N A R Y
Le79R251 ISLIC Data Sheet
3
PRODUCT DESCRIPTION
Legerity’s Intelligent Access voice chipsets integrate all the functions of a subscriber line. Two chip types are used to implement
the line card: an Le79R251 device and an ISLAC device. Current ISLAC devices include the following: 79Q2241, 79Q2242,
79Q2243, and 79D2251. These provide the following basic functions:
1.
The Le79R251 device: A high voltage, bipolar device that drives the subscriber line, maintains longitudinal balance and
senses line conditions.
The ISLAC device: A low voltage CMOS IC that provides conversion, control and DSP functions for the Le79R251 de-
vice.
2.
A complete schematic of the line card using the Intelligent Access voice chipsets for internal ringing is shown in “Internal Ringing
Line Card Schematic” on page 18.
The Le79R251 device uses reliable, bipolar technology to provide the power necessary to drive a wide variety of subscriber lines.
It can be programmed by the ISLAC device to operate in eight different modes that control power consumption and signaling,
enabling it to have full control over the subscriber loop. The Le79R251 device is designed to be used exclusively with the ISLAC
devices, and requires only +5 V, 3.3 V battery supplies for its operation.
The Le79R251 device implements a linear loop-current feeding method with the enhancement of intelligent thermal
management. This limits the amount of power dissipated on the Le79R251 device chip by dissipating power in external resistors
in a controlled manner.
The ISLAC device contains high-performance circuits that provide A/D and D/A conversion for the voice (codec), DC-feed and
supervision signals. The ISLAC device contains a DSP core that handles signaling, DC-feed, supervision and line diagnostics for
all channels.
The DSP core selectively interfaces with three types of backplanes:
Standard PCM/MPI
Standard GCI
Modified GCI with a single analog line per GCI channel
The Intelligent Access voice chipset provides a complete software configurable solution to the BORSCHT functions as well as
complete programmable control over subscriber line DC-feed characteristics, such as current limit and feed resistance. In
addition, these chipsets provide system level solutions for the loop supervisory functions and metering. In total, they provide a
programmable solution that can satisfy worldwide line card requirements by software configuration.
Software programmed filter coefficients, DC-feed data and supervision data are easily calculated with the WinSLAC software.
This PC software is provided free of charge, and it allows the designer to enter a description of system requirements. WinSLAC
then computes the necessary coefficients and plots the predicted system results.
The Le79R251 device includes circuitry to report metallic voltages and longitudinal currents on Tip/Ring to the ISLAC device.
These inputs allow the ISLAC device to place several key Le79R251 device performance parameters under software control.
The main functions that can be observed and/or controlled through the ISLAC backplane interface are:
DC-feed characteristics
Ground-key detection
Off-hook detection
Metering signal
Longitudinal operating point
Subscriber line voltage and currents
Ring-trip detection
Abrupt and smooth battery reversal
Subscriber line matching
Ringing generation
Sophisticated line and circuit tests
To accomplish these functions, the ISLIC device collects the following information and feeds it, in analog form, to the ISLAC
device:
The metallic (IMT) and longitudinal (ILG) loop currents
The AC (VTX) and DC (VSAB) loop voltage
The outputs supplied by the ISLAC device to the ISLIC device are then:
A voltage (VHLi) that provides control for the following high-level ISLIC device outputs:
–
DC loop current
–
Internal ringing signal
相關(guān)PDF資料
PDF描述
LEA20033 ASIC
LEA20040 ASIC
LEA20046 ASIC
LEA20056 ASIC
LEA20066 ASIC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LE79R70-1DJC 制造商:Microsemi Corporation 功能描述:SLIC 1CH 40DB 110MA 5V 32PLCC - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SLIC 1CH 40DB LGBAL 32PLCC
LE79R70-1DJCT 制造商:Microsemi Corporation 功能描述:1CH SLIC 40DB LGBAL P RV PL32TR 制造商:Microsemi Corporation 功能描述:SLIC 1CH 40DB 110MA 5V 32PLCC - Tape and Reel 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SLIC 1CH 40DB LGBAL 32PLCC 制造商:Microsemi Corporation 功能描述:IC SLIC 1CH 40DB LGBAL 32PLCC
LE79R70-1FQC 制造商:Microsemi Corporation 功能描述:SLIC 1CH 40DB 110MA 5V 32QFN EP - Trays 制造商:Microsemi Corporation 功能描述:SINGLE SLIC SHORT LOOP LONG-BAL POL REV 制造商:Zarlink Semiconductor Inc 功能描述:SINGLE SLIC SHORT LOOP LONG-BAL POL REV
LE79R70-1FQCT 制造商:Microsemi Corporation 功能描述:SLIC 1CH 40DB 110MA 5V 32QFN EP - Tape and Reel
LE79R70DJC 制造商:Microsemi Corporation 功能描述:SLIC 1CH 40DB 110MA 5V 32PLCC - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SLIC 1CH 40DB LGBAL 32PLCC 制造商:Microsemi Corporation 功能描述:IC SLIC 1CH 40DB LGBAL 32PLCC
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

*
*
*