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Out-Off Band demodulation scheme :

On chip 7-bit ADC.

-

DQPSK demodulator.

-

Roll-off factor = 0.3 .

-

Direct IF sampling.

-

Variable bit rate from 1 to 12 Mbit/s (SAW

-

@ 8MHz BW).

Automatic Gain Control PWM output.

-

Descrambler.

-

Frame synchronization.

-

Deinterleaver.

-

RS decoder (55,53) .

-

鈥?/div>

In Band scheme :

Parallel or serial MPEG2 Transport Stream

-

inputs.

MAC PID filtering.

-

DAVIC ATM cells transmission supported.

-

鈥?/div>

Up-Stream synchronization.

鈥?/div>

Up-Stream modulation scheme :

Burst QPSK/16QAM modulator.

-

Roll-off factor = 0.25/0.3 .

-

Programmable preamble value.

-

Programmable burst length.

-

Direct IF synthesys from 5 to 46 MHz.

-

I and Q base band outputs provided.

-

Variable bit rate from 256kbit/s to 16Mbit/s.

-

Programmable RS encoder.

-

Scrambler.

-

On chip 10 bit DACs.

鈥?/div>

External MAC functionality.

鈥?/div>

Package 208 MQFP.

鈥?/div>

CMOS technology (0.35碌m, 3.3V).

APPLICATIONS

鈥?/div>

Cable modem.

DVB interactive set-top box.

DAVIC ATM cable physical layer.

DESCRIPTION

Based on the DVB-RC cable and DAVIC

specifications, the VES 1848 allows interactive

communication through HFC network between set-

top boxes and headends.

For Down Stream (DS) channel the circuit

implements a differential QPSK demodulator (Out Of

Band application) and accepts MPEG2 Transport

Stream inputs from a DS QAM demodulator (In Band

application). This channel allows to synchronize the

Up Stream (US) channel and to provide data to the

MAC layer which remains external.

The US channel is highly programmable and built

around a digital burst QPSK or 16QAM modulator

with direct IF synthesys or I and Q base band

outputs. The modulator is fully DVB and MCNS

compliant thanks to its burst profile programmation

(burst length, preamble, RS encoder, scrambler, bit

rate 鈥?.

The VES 1848 is packaged in a 208 MQFP, and

operates over the commercial temperature 0-70擄C.

comatlas S.A.,

30 rue du Ch錨ne Germain, BP 814, 35518 CESSON SEVIGNE Cedex, France

Phone : + 33 2 99 27 55 55 鈥?Fax : +33 2 99 27 55 27, Internet : www.comatlas.fr / VES 1848 rev 1.2 / July 99

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