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ST70235A PDF预览

ST70235A

更新时间: 2024-11-22 22:33:59
品牌 Logo 应用领域
意法半导体 - STMICROELECTRONICS ATM集成电路SONET集成电路SDH集成电路电信集成电路电信电路异步传输模式
页数 文件大小 规格书
28页 258K
描述
ASCOTTM DMT TRANSCEIVER

ST70235A 技术参数

是否Rohs认证: 符合生命周期:Active
零件包装代码:QFP包装说明:LFQFP, QFP144,.87SQ,20
针数:144Reach Compliance Code:compliant
HTS代码:8542.39.00.01风险等级:5.77
应用程序:ATMJESD-30 代码:S-PQFP-G144
JESD-609代码:e4长度:20 mm
功能数量:1端子数量:144
最高工作温度:70 °C最低工作温度:
封装主体材料:PLASTIC/EPOXY封装代码:LFQFP
封装等效代码:QFP144,.87SQ,20封装形状:SQUARE
封装形式:FLATPACK, LOW PROFILE, FINE PITCH电源:1.8,3.3 V
认证状态:Not Qualified座面最大高度:1.6 mm
子类别:Other Telecom ICs标称供电电压:1.8 V
表面贴装:YES技术:CMOS
电信集成电路类型:ATM/SONET/SDH SUPPORT CIRCUIT温度等级:COMMERCIAL
端子面层:Nickel/Palladium/Gold (Ni/Pd/Au)端子形式:GULL WING
端子节距:0.5 mm端子位置:QUAD
宽度:20 mmBase Number Matches:1

ST70235A 数据手册

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ST70235A  
ASCOTTM DMT TRANSCEIVER  
PRELIMINARY DATA  
DMT  
MODEM  
FOR  
CPE  
ADSL,  
GENERAL DESCRIPTION  
COMPATIBLE WITH THE FOLLOWING  
STANDARDS:  
- ANSI T1.413 ISSUE 2  
- ITU-T G.992.1 (G.DMT)  
- ITU-T G.992.2 (G.LITE)  
The ST70235A is the DMT modem and ATM  
framer of the STMicroelectronics ASCOT™  
chipset. When coupled with ST70134 analog  
front-end and an external controller running  
dedicated firmware, the product fulfills ANSI  
T1.413 "Issue 2" DMT ADSL specification. The  
chip supports UTOPIA level 1 and UTOPIA level 2  
interface.  
SUPPORTS EITHER ATM (UTOPIA LEVEL  
1 & 2) OR BITSTREAM INTERFACE  
The ST70235A can be split up into two different  
sections. The physical one performs the  
DMT modulation, demodulation, Reed-Solomon  
encoding, bit interleaving and 4D trellis coding.  
16 BIT MULTIPLEXED MICROPROCESSOR  
INTERFACE (LITTLE AND BIG ENDIAN  
COMPATIBILITY)  
ANALOG FRONT END MANAGEMENT  
The ATM section embodies framing functions for  
the generic and ATM Transmission Convergence  
(TC) layers. The generic TC consists of data  
scrambling and Reed Solomon error corrections,  
with and without interleaving.  
DUAL LATENCY PATHS: FAST AND  
INTERLEAVED  
ATM’S PHY LAYER: CELL PROCESSING  
(CELL DELINEATION, CELL INSERTION,  
HEC)  
The ST70235A is controlled and programmed  
by an external controller (ADSL Transceiver Con-  
troller, ATC) that sets the programmable coeffi-  
cients. The firmware controls the initialization  
phase and carries out the consequent adaptation  
operations.  
ADSL’S OVERHEAD MANAGEMENT  
REED SOLOMON ENCODE/DECODE  
TRELLIS ENCODE/DECODE (VITERBI)  
DMT MAPPING / DEMAPPING OVER 256  
CARRIERS  
FINE (2PPM) TIMING RECOVER USING  
ROTOR AND ADAPTATIVE FREQUENCY  
DOMAIN EQUALIZING  
TIME DOMAIN EQUALIZATION  
FRONT END DIGITAL FILTERS  
0.25µm HCMOS7 TECHNOLOGY  
144 PIN TQFP  
TQFP144 Full Plastic  
(20 x 20 x 1.40 mm)  
POWER CONSUMPTION: 0.4 WATT  
ORDER CODE: ST70235A  
APPLICATIONS  
Routers at SOHO, stand-alone modems, PC  
modems.  
October 2001  
1/28  
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.  

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