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MTC20454-TQ-I Datasheet

  • MTC20454-TQ-I

  • QUAD INTEGRATED ADSL CMOS ANALOG FRONT END CIRCUIT

  • 518.34KB

  • 15頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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MTC20454
QUAD INTEGRATED ADSL CMOS
ANALOG FRONT END CIRCUIT
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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
TQFP100 14x14x1.4
ORDERING NUMBER: MTC20454-TQ-I
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.
APPLICATIONS
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ADSL Front-end for high density, low power
central office and digital loop carrier equipment
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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
Figure 1. Sample board layout
Discrete
FE
LD
Discrete
FE
LD
MTC20454
Quad Analog Front End
MTC20455
Quad ADSL DMT Modem
and ATM Framer
Line
Discrete
FE
LD
ATM
Discrete
FE
LD
SDRAM
MTC20136
Modem
Controller
February 2004
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