參數(shù)資料
型號(hào)： VES1848
英文描述： MODEM CIRCUIT|MODEM|CMOS|QFP|208PIN|PLASTIC
中文描述： 調(diào)制解調(diào)器電路|調(diào)制解調(diào)器|的CMOS | QFP封裝| 208PIN |塑料
文件頁(yè)數(shù)： 1/18頁(yè)
文件大小： 223K
代理商： VES1848
comatlas S.A.
, 30 rue du Chêne Germain, BP 814, 35518 CESSON SEVIGNE Cedex, France
VES 1848
SINGLE CHIP
DAVIC / DVB-RC
CABLE MODEM
FEATURES
Fully compliant ETS300800 and DAVIC 1.2
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) .
In Band scheme :
-
Parallel or serial MPEG2 Transport Stream
inputs.
-
MAC PID filtering.
-
DAVIC ATM cells transmission supported.
Up-Stream synchronization.
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.
External MAC functionality.
Package 208 MQFP.
CMOS technology (0.35
μ
m, 3.3V).
APPLICATIONS
Cable modem.
DVB interactive set-top box.
DAVIC ATM cable physical layer.
DESCRIPTION
Based
on the
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 …).
The VES 1848 is packaged in a 208 MQFP, and
operates over the commercial temperature 0-70°C.
DVB-RC
cable
and
DAVIC
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