MTC20454-TQ-I datasheet(1/15 Pages) STMICROELECTRONICS

No de pièce	MTC20454-TQ-I

Description	QUAD INTEGRATED ADSL CMOS ANALOG FRONT END CIRCUIT

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MTC20454

February 2004

■ Fully integrated quad AFE for ADSL

■ Overall 12 bit resolution

■ 1.1MHz signal bandwidth

■ 8.8 MS/s ADC

■ 8.8 MS/s DAC

■ THD: -60 dB @ full scale

■ 1 V full scale input

■ Differential analog I/O

■ Accurate continuous-time channel filtering

■ 3rd & 4th order tuneable continuous time LP

Filters

■ 100 pin TQFP package, Industrial Range

qualified

■ 175 mW power consumption per line

APPLICATIONS

■ ADSL Front-end for high density, low power

central office and digital loop carrier equipment

■ DESCRIPTION

The MTC20454 is the first DynaMiTe ADSL (Asyn-

chronous Digital Subscriber Line) analog front end

designed specifically for the central office. It is a

fifth generation Analog Front End (AFE) designed

for DMT based ADSL modems compliant with ITU

G.992.1 and G.992.1 standards. It includes four 12

bit DACs and one 13 bit ADC.

It is intended to be used with the MTC20455 DMT/

ATM processor as part of the MTK20450. The

MTC20454 provides programmable low pass fil-

ters for each of the two channels and automatic

gain control for four individual ADSL modems.

The pipeline ADC architecture provides 13 bit dy-

namic range and a signal bandwidth of 1.1 MHz.

The device consumes only 0.7 Watt in full opera-

tion of all four modems and has a power down

mode for standby.

It is housed in a compact 100 pin thin plastic quad

flat package.

TQFP100 14x14x1.4

ORDERING NUMBER: MTC20454-TQ-I

QUAD INTEGRATED ADSL CMOS

ANALOG FRONT END CIRCUIT

Figure 1. Sample board layout

ATM

SDRAM

MTC20136

Modem

Controller

Line

Discrete

FE

MTC20454

Quad Analog Front End

MTC20455

Quad ADSL DMT Modem

and ATM Framer

LD

Discrete

FE

Discrete

FE

Discrete

FE

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