參數(shù)資料
型號(hào)： 935264535557
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PQFP208
封裝： SOT-316, MQFP-208
文件頁(yè)數(shù)： 14/23頁(yè)
文件大?。?/td> 194K
代理商： 935264535557
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VES1848
Information as of 2000-08-17
VES1848; Single Chip DAVIC/DVB-RC Cable Modem
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 ...).
The VES 1848 is packaged in a 208 MQFP, and operates over the commercial temperature 0-70 Cel.
l
Fully compliant ETS300800 and DAVIC 1.2
l
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).
l
In Band scheme:
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