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MTC20174

September 2004

This is preliminary information on a new product foreseen to be developed. Details are subject to change without notice.

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FEATURES

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Fully Integrated AFE and Line Driver for ADSL

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Overall 12 bit resolution, 1.1MHz signal

bandwidth

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8.8 MS/s ADC

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8.8 MS/s DAC

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Differential analog I/O

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Accurate continuous-time channel filtering

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and transmit filters respectively

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Support for multiple ADSL standards:

– ANSI T1.413 Issue 2

– ITU G.992.1 (G.dmt)

– Annex A

– Annex B (ADSL over ISDN)

– Annex C (ADSL over ISDN SBM/DBM/

G.dmt)

– ITU G.992.2 (G.lite)

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Highest performance:

– Operation up to 18 kft (26 AWG)

– More than 8 Mbps downstream and 832 Kbps

upstream up to 8 kft (26 AWG)

– More than 3 Mbps downstream and 760 kbps

upstream up to 12 kft (26 AWG)

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100 pin TQFP package allows high-density

board design

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Power dissipation of 900mW at 25°C, typical

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APPLICATIONS

The MTC20174 is an ADSL Analog Front-End

(AFE) with integrated Line-Driver for ATU-R appli-

cations offering Annex A, B and C.

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GENERAL DESCRIPTION

The MTC20174 Analog Front End (AFE) with inte-

grated line driver is designed for DMT based

ADSL CPE modems compliant with ANSI T1.413

issue 2, ITU G.992.1 (G.dmt) and ITU G.992.2

(G.lite), for Annex A, B and C.

It is intended to be used with the MTC20166 DMT

modem and ATM framer as part of the MTK20170

chipset, but may also be used to support other

ADSL signal processors. It includes the following

parts:

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A 12-bit 8.8Msamples/s DAC

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A 13-bit 8.8Msamples/s ADC

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Tunable low-pass and high-pass filters

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Low-noise PGAs

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A TX Pre-Amplifier

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A TX Line-Driver

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A fully integrated DCXO

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A PLL-based frequency doubler

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A filter tuning circuit

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A dying gasp circuit

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A digital module for control, test and interface

The following figure provides a graphical repre-

sentation of the MTC20174 functional blocks with

an additional separation in RX and TX path.

The analog and digital part have separated 3.3V

power supplies. In addition some part of the ana-

log section of the MTC20174 has a power supply

of 5V.

The typical total power consumption of the

MTC20174 is 900mW for 12dBm of line power (full

operation) at 250°C.

The package is a 100 pin TQFP.

DATA BRIEF

ADSL ANALOG FRONT END WITH INTEGRATED LINE

DRIVER FOR CPE APPLICATIONS

Figure 3. Package

Table 2. Order Codes

Part Number

Package

Temperature

MTC20174-TQ-C1

TQFP100

0 to 70°C

MTC20174-TQ-C1TR

Tape & Reel

0 to 70°C

TQFP100