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VES1820X

更新时间： 2024-09-23 22:16:11
品牌 Logo 应用领域
恩智浦 - NXP /
页数 文件大小 规格书
12页 106K
描述
SINGLE CHIP DVB-C CHANNEL RECEIVER

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中文翻译

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VES1820X 技术参数

生命周期：Obsolete零件包装代码：QFP
包装说明：QFP,针数：100
Reach Compliance Code：unknownHTS代码：8542.39.00.01
风险等级：5.83其他特性：ALSO REQUIRES 5V SUPPLY
商用集成电路类型：CONSUMER CIRCUITJESD-30 代码：R-PQFP-G100
长度：20 mm功能数量：1
端子数量：100最高工作温度：70 °C
最低工作温度：封装主体材料：PLASTIC/EPOXY
封装代码：QFP封装形状：RECTANGULAR
封装形式：FLATPACK认证状态：Not Qualified
座面最大高度：3.3 mm最大供电电压 (Vsup)：3.46 V
最小供电电压 (Vsup)：3.14 V表面贴装：YES
技术：CMOS温度等级：COMMERCIAL
端子形式：GULL WING端子节距：0.65 mm
端子位置：QUAD宽度：14 mm
Base Number Matches：1

VES1820X 数据手册

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VES1820X  
SINGLE CHIP  
DVB-C  
CHANNEL RECEIVER  
FEATURES  
APPLICATIONS  
•
16/32/64/128/256 QAM demodulator  
(DVB-C compatible : ETS 300-429).  
On chip 9-bit ADC.  
On chip PLL for crystal frequency  
multiplication.  
•
•
•
•
•
DVB-C fully compatible.  
Digital data transmission using QAM modulations.  
Cable demodulation.  
Cable modems  
MMDS (ETS 300-429).  
•
•
•
•
•
Digital down conversion.  
Half Nyquist filters (roll off = 15 %).  
Automatic gain control PWM output  
(AGC).  
DESCRIPTION  
The VES1820X is a single chip channel receiver for 16, 32, 64, 128  
and 256-QAM modulated signals. The device interfaces directly to  
the IF signal, which is sampled by a 9-bit AD converter.  
The VES1820X performs the clock and the carrier recovery  
functions. The digital loop filters for both clock and carrier recovery  
are programmable in order to optimize their characteristics  
according to the current application.  
After base band conversion, equalization filters are used for echo  
cancellation in cable applications. These filters are configured as T-  
spaced transversal equalizer or DFE equalizer, so that the system  
performance can be optimized according to the network  
characteristics. A proprietary equalization algorithm, independent of  
carrier offset, is achieved in order to assist carrier recovery. Then a  
decision directed algorithm takes place, to achieve final  
equalization convergence.  
The VES1820X implements a FORNEY convolutional deinterleaver  
of depth 12 blocks and a Reed-Solomon decoder which corrects up  
to 8 erroneous bytes. The deinterleaver and the RS decoder are  
automatically synchronized thanks to the frame synchronization  
algorithm which uses the MPEG2 sync byte. Finally descrambling  
according to DVB-C standard, is achieved at the Reed Solomon  
output. This device is controlled via an I2C bus.  
•
•
Symbol timing recovery, with  
programmable second order loop filter.  
Variable symbol rate capability from  
SACLK/64 to SACLK/4  
(SACLK max = 36 MHz)  
•
•
•
Programmable anti-aliasing filters.  
Full digital carrier recovery loop.  
Carrier acquisition range up to 8 % of  
symbol rate.  
Integrated adaptative equalizer (Linear  
Transversal Equalizer or Decision  
Feedback Equalizer).  
On chip FEC decoder (Deinterleaver &  
RS decoder), full DVB-C compliant.  
DVB compatible differential decoding  
and mapping.  
Parallel or serial transport stream  
interface.  
•
•
•
•
•
•
I2C bus interface, for easy control.  
CMOS 0.35µm technology.  
Designed in 0.35 µm CMOS technology and housed in a 100 pin  
MQFP package, the VES1820X operates over the commercial  
temperature range.  
comatlas S.A., 30 rue du Chêne Germain, BP 814, 35518 CESSON-SEVIGNE Cedex, FRANCE  
Phone : +33 (0)2 99 27 55 55, Fax : +33 (0)2 99 27 55 27 , Internet: www.comatlas.fr / VES 1820X rev 2.0 / Mar 99  
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