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ST70235A

Features: ` DMT MODEM FOR CPE ADSL,COMPATIBLE WITH THE FOLLOWING STANDARDS: - ANSI T1.413 ISSUE 2 - ITU-T G.992.1 (G.DMT) - ITU-T G.992.2 (G.LITE)` SUPPORTS EITHER ATM (UTOPIA LEVEL 1 & 2) OR BITSTREAM INTERFACE` 16 BIT MULTIPLEXED MICROPROCESSOR INTERFACE (LITTLE AND BIG ENDIAN COMPATIBILITY)...

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SeekIC No. : 004506690 Detail

ST70235A: Features: ` DMT MODEM FOR CPE ADSL,COMPATIBLE WITH THE FOLLOWING STANDARDS: - ANSI T1.413 ISSUE 2 - ITU-T G.992.1 (G.DMT) - ITU-T G.992.2 (G.LITE)` SUPPORTS EITHER ATM (UTOPIA LEVEL 1 & 2) OR BI...

ST70235A Data Sheet

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Part Number:
ST70235A
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

 `  DMT MODEM FOR CPE ADSL,COMPATIBLE WITH THE FOLLOWING STANDARDS:
   - ANSI T1.413 ISSUE 2
   - ITU-T G.992.1 (G.DMT)
   - ITU-T G.992.2 (G.LITE)
 `  SUPPORTS EITHER ATM (UTOPIA LEVEL 1 & 2) OR BITSTREAM INTERFACE
 `  16 BIT MULTIPLEXED MICROPROCESSOR INTERFACE (LITTLE AND BIG ENDIAN COMPATIBILITY)
 `  ANALOG FRONT END MANAGEMENT
 `  DUAL LATENCY PATHS: FAST AND INTERLEAVED
 `  ATM'S PHY LAYER: CELL PROCESSING (CELL DELINEATION, CELL INSERTION, HEC)
 `  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
 `  0.25m HCMOS7 TECHNOLOGY
 `  144 PIN TQFP
 `  POWER CONSUMPTION: 0.4 WATT


Application

 · Routers at SOHO, stand-alone modems, PC modems.


Pinout

Connection Diagram


Specifications

Symbol Parameter Min. Typ. Max. Unit
VDD3.3 Supply Voltage 3.0 3.3 3.6 V
VDD1.8 Supply Voltage 1.62 1.8 1.98 V
Ptot Total Power Dissipation   300 400 mW
Tamb Ambient Temperature 1m/s airflow 0   70
Rth J/A Thermal Resistivity   38   /W
I3.3 Current Consumption     14 mA
I1.8 Current Consumption     135 mA



Description

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.

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 Controller,ATC) that sets the programmable coefficients. The firmware controls the initialization phase and carries out the consequent adaptation operations.




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