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參數(shù)資料
| 型號： | ST70235A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | ASCOTTM DMT TRANSCEIVER |
| 中文描述： | ASCOTTM大唐收發(fā)器 |
| 文件頁數(shù)： | 1/28頁 |
| 文件大?。?/td> | 257K |
| 代理商： | ST70235A |
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1/28
October 2001
I
DMT
COMPATIBLE WITH THE FOLLOWING
STANDARDS:
- ANSI T1.413 ISSUE 2
- ITU-T G.992.1 (G.DMT)
- ITU-T G.992.2 (G.LITE)
MODEM
FOR
CPE
ADSL,
I
SUPPORTS EITHER ATM (UTOPIA LEVEL
1 & 2) OR BITSTREAM INTERFACE
I
16 BIT MULTIPLEXED MICROPROCESSOR
INTERFACE (LITTLE AND BIG ENDIAN
COMPATIBILITY)
I
ANALOG FRONT END MANAGEMENT
I
DUAL
INTERLEAVED
LATENCY
PATHS:
FAST
AND
I
ATM’S PHY LAYER: CELL PROCESSING
(CELL DELINEATION, CELL INSERTION,
HEC)
I
ADSL’S OVERHEAD MANAGEMENT
I
REED SOLOMON ENCODE/DECODE
I
TRELLIS ENCODE/DECODE (VITERBI)
I
DMT MAPPING / DEMAPPING OVER 256
CARRIERS
I
FINE (2PPM) TIMING RECOVER USING
ROTOR AND ADAPTATIVE FREQUENCY
DOMAIN EQUALIZING
I
TIME DOMAIN EQUALIZATION
I
FRONT END DIGITAL FILTERS
I
0.25
μ
m HCMOS7 TECHNOLOGY
144 PIN TQFP
I
I
POWER CONSUMPTION: 0.4 WATT
APPLICATIONS
Routers at SOHO, stand-alone modems, PC
modems.
GENERAL DESCRIPTION
The ST70235A is the DMT modem and ATM
framer of
the
STMicroelectronics
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.
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.
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.
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.
ASCOT
TQFP144 Full Plastic
(20 x 20 x 1.40 mm)
ORDER CODE:
ST70235A
ST70235A
ASCOT
TM
DMT TRANSCEIVER
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
PRELIMINARY DATA
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參數(shù)描述 |
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| ST7024 | 制造商:Pulse 功能描述:- Bulk |
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| ST70-27F | 功能描述:穩(wěn)壓二極管 Zener Diode RoHS:否 制造商:Vishay Semiconductors 齊納電壓:12 V 電壓容差:5 % 電壓溫度系數(shù):0.075 % / K 齊納電流: 功率耗散:3 W 最大反向漏泄電流:3 uA 最大齊納阻抗:7 Ohms 最大工作溫度:+ 150 C 安裝風格:SMD/SMT 封裝 / 箱體:DO-214AC 封裝:Reel |
| ST70-27F_10 | 制造商:SHINDENGEN 制造商全稱:Shindengen Electric Mfg.Co.Ltd 功能描述:Power zener Diode |
| ST70-27F-7072 | 功能描述:穩(wěn)壓二極管 27 Volt 7000 Watt RoHS:否 制造商:Vishay Semiconductors 齊納電壓:12 V 電壓容差:5 % 電壓溫度系數(shù):0.075 % / K 齊納電流: 功率耗散:3 W 最大反向漏泄電流:3 uA 最大齊納阻抗:7 Ohms 最大工作溫度:+ 150 C 安裝風格:SMD/SMT 封裝 / 箱體:DO-214AC 封裝:Reel |
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