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LE79231QC

更新时间： 2024-11-30 06:04:03
品牌 Logo 应用领域
美高森美 - MICROSEMI /
页数 文件大小 规格书
24页 641K
描述
SLIC, Bipolar, 8 X 8 MM, MO-220, QFN-32

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LE79231QC 数据手册

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™
Le79231  
Intelligent Subscriber Line Interface Circuit  
VE790 Series  
DESCRIPTION  
APPLICATIONS  
„ Enables a cost effective voice solution for long or short  
loop applications providing POTS and integrated test  
capabilities  
The Le79231 ISLIC device, in combination with a VE790 series  
ISLAC™ device, implements the telephone line interface  
function. This enables the design of a low-cost, high  
performance, fully software programmable line interface for  
multiple country applications worldwide. All AC, DC, and  
signaling parameters are fully programmable via  
microprocessor or GCI interfaces on the VE790 series ISLAC  
devices. Additionally, the Le79231 ISLIC device has integrated  
self-test and line-test capabilities to resolve faults to the line or  
line circuit. The integrated test capability is crucial for remote  
applications where dedicated test hardware is not cost  
effective.  
— CO  
— DLC  
— PBX/KTS  
— Pair Gain  
FEATURES  
„ Monitor of two-wire interface voltages and currents  
supports  
— Voice transmission  
— Programmable DC feed characteristics  
RELATED LITERATURE  
–
–
Independent of battery  
Current limited  
„ 080250 Le79Q2241x Quad ISLAC™ Device Data Sheet  
„ 081065 Le79228 Quad ISLAC™ Device Data Sheet  
„ 080262 VE790 Series Evaluation Board User’s Guide  
„ 080804 Le79R2xx/Le79Q224x Chip Set User’s Guide  
„ 080923 Le79R2xx/Le79228 Chip Set User’s Guide  
— Selectable off-hook and ground-key thresholds  
— Subscriber line diagnostics  
–
–
–
–
–
Leakage resistance  
Loop resistance  
Line capacitance  
Bell capacitance  
Foreign voltage sensing  
— Power cross and fault detection  
„ Ring relay driver for external ringing  
„ +5 V and battery supplies  
BLOCK DIAGRAM  
„ Dual battery operation for system power saving  
Signal  
Transmission  
RSN  
VTX  
— Automatic battery switching  
AD  
SA  
— Intelligent thermal management  
„ Compatible with inexpensive protection networks  
— Accommodates low tolerance fuse resistors or PTC  
thermistors  
Longitudinal  
Control  
Gain/Level  
Shift  
VLB  
HPA  
HPB  
SB  
Two-Wire  
Interface  
Attenuator  
VSAB  
VREF  
„ Metering capable  
BD  
— 12 kHz and 16 kHz  
— Smooth polarity reversal  
Signal  
Conditioning  
IMT  
ILG  
„ Tip-open state supports ground start signaling  
„ Integrated test load switches/relay drivers  
„ Space Saving Package Options (8 x 8 QFN)  
TMN  
TMP  
TMS  
Thermal  
Management  
Control  
CREF  
Fault  
Meas.  
VBL  
ORDERING INFORMATION  
Switch Driver  
A VE790 series ISLAC™ device must be used with this part.  
VBH  
Relay  
Control  
Device  
Le79231JC  
Le79231DJC  
Package  
R2  
R3  
RYE  
Relay  
Drivers  
P1  
P2  
P3  
LD  
Input Decoder and  
Control Registers  
32-pin PLCC  
Relay  
Driver 1  
R1  
32-pin PLCC (Green package)1  
32-pin QFN  
Le79231QC2  
Le79231FQC2  
32-pin QFN (Green package)1  
1. Green package meets RoHS Directive 2002/95/EC of the European  
Council to minimize the environmental impact of electrical equipment.  
2. Due to size constraints, QFN devices are marked by omitting the  
“Le” prefix. For example, Le79231QC is marked 79231QC.  
Document ID# 080248 Date:  
Sep 19, 2007  
2
Rev:  
F
Version:  
Distribution:  
Public Document  
1234567...24

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