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參數(shù)資料
| 型號(hào)： | L64780 |
| 英文描述： | L64780 DVB-T COFDM Demodulator technical manual 2/00 |
| 中文描述： | L64780的DVB - T COFDM解調(diào)器技術(shù)手冊2 / 00 |
| 文件頁數(shù)： | 2/4頁 |
| 文件大小： | 164K |
| 代理商： | L64780 |
Features
2K and8K FFT size
Includes FECand10-bt ADC
Dgital timng recovery
6MHz,7MHz and8MHz variabe bandwidth
capablity
Impements non-herarchcal QPSK16-QAM
and64-QAMconstellations andherarchcal
constellations withscale factors a = 1,2 and4
Viterb code rates 1/2,2/3,3/4,5/6,7/8
Guardintervals:1/4,1/8,1/16,1/32
Includes dgital commonphase error
correction(CPE)
Channel state informationfor protection
against mutipathandinterference
NMboardwithCOFDMdemoduatortuner
andserial host interface
Low IF (4.57MHz) samping withdgital
basebanddown-conversionallowing for
single ADC
Serial mcroprocessor interface
L64781 Single-Chip COFDM Receiver
Technical Description
The L64781 implements all operational modes specified in the DVB-T specification,
i.e., 2K and 8K FFT, non-hierarchical and hierarchical modulations, all guard
interval sizes and Viterbi code rates. The chip samples a low IF signal (IF = 4.57 MHz)
and converts it digitally into baseband.
The L64781 then applies all digital processing steps to extract the data from the
received signal, i.e., FFT, timing and frequency synchronization, channel estimation
and equalization, generation of optimal soft decisions using the channel state
information, symbol and bit de-interleaving. It also extracts the system information
carried by the TPS pilots, stores it into internal registers and delivers it to an
external micro controller. The L64781 finally applies all error correcting codes to
deliver an error-free MPEG2 transport stream to the source decoding chip.
The L64781 is a highly integrated device that contains both digital timing and
frequency loops. No external components are required to operate the demodulation,
and only a low cost XO is required. If the tuner requires an analog feedback, the
device also provides means for analog timing and frequency control signals in the
form of one wire sigma-delta modulated signals. This requires minimal external
circuitry and interconnection.
It implements a standard serial micro controller interface.
The L64781 applies all error correcting codes to deliver an error-free MPEG2 transport streamto the
source decoding chip
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L64801GC-20 | 32-Bit Microprocessor |
| L64801GC-25 | 32-Bit Microprocessor |
| L64801GM-20 | 32-Bit Microprocessor |
| L64801NC-20 | 32-Bit Microprocessor |
| L64801NC-25 | 32-Bit Microprocessor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L64781 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Chip COFDM Receiver |
| L64782 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:L64782 Single-Chip COFDM Receiver |
| L6480 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:The L6480, realized in analog mixed signal technology, is an advanced fully integrated solution suitable for driving two-phase bipolar stepper motors with microstepping. |
| L64801GC-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
| L64801GC-25 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
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