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ST70134 - ST70134A

ASCOT

TM

INTEGRATED ADSL CMOS

ANALOG FRONT-END CIRCUIT

s

FULLY INTEGRATED AFE FOR CPE ADSL

s

OVERALL 12 BIT RESOLUTION, 1.1MHz

SIGNAL BANDWIDTH IN Rx

s

8.8MS/s ADC

s

8.8MS/s DAC

s

THD: -60dB @FULL SCALE

s

4-BIT DIGITAL INTERFACE TO/FROM THE

DMT MODEM

TQFP64

ORDERING NUMBER:

ST70134 (TQFP64)

ST70134A (TQFP64)

The ST70134 analog front end handles 2 trans-

mission channels on a balanced 2 wire intercon-

nection; a 16 to 640Kbit/s upstream transmit

channel and a 1.536Mbit/s to 8.192Mbit/s down-

stream receive channel.

This asymmetrical data transmission system uses

high resolution, high speed analog to digital and

digital to analog conversion and high order analog

filtering to reduce the echo and noise in both

receivers and transmitters.

External low noise driver and input stage used

with ST70134 guarantee low noise performances.

The filters, with a programmable cutoff frequency,

use automatic Continuous Time Tuning to avoid

time varying phase characteristic which can be of

dramatic consequence for DMT modem.

It requires few external components, uses a 3.3V

supply. It is packaged in a 64-pin TQFP in order to

reduce PCB area.

s

1V FULL SCALE INPUT

s

DIFFERENTIAL ANALOG I/O

s

ACCURATE CONTINUOUS-TIME CHANNEL

FILTERING

s

3rd & 4th ORDER TUNABLE CONTINUOUS

TIME LP FILTERS

s

0.5 WATT AT 3.3V

s

0.5mm HCMOS5 LA TECHNOLOGY

s

64 PIN TQFP PACKAGE

DESCRIPTION

ST70134 is the Analog Front End of the STMicro-

electronics ASCOT

TM

ADSL chipset and when

coupled with ST70135A or ST70235 (DMT

modem) allows to get a T1.413 Issue 2 or G.dmt

compliant solution.

January 2001

1/22

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  英文版
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