- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄369714 > L64777 (LSI CORP) Digital Video Broadcasting(DVB)-Compliant,quadrature amplitude modulation (QAM)Modulator(數(shù)字視頻廣播系統(tǒng)適配的積分調(diào)幅調(diào)制器) PDF資料下載
參數(shù)資料
| 型號： | L64777 |
| 廠商： | LSI CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Digital Video Broadcasting(DVB)-Compliant,quadrature amplitude modulation (QAM)Modulator(數(shù)字視頻廣播系統(tǒng)適配的積分調(diào)幅調(diào)制器) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP120 |
| 封裝： | 32 MM, PLASTIC, QFP-120 |
| 文件頁數(shù)： | 53/124頁 |
| 文件大?。?/td> | 988K |
| 代理商： | L64777 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁當(dāng)前第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁
Interpolator
2-39
Note that the virtual FIFO, which indicates the FIFO under- or over-run,
is an internal location.
If the NCO_GAIN has reached the smallest possible value of 1, the
AUTO_ACQUISITION terminates. The AUTO_ACQUI_RUNNING bit
(Register 13, bit 3) sets to zero, indicating termination. If enabled, the
NCO can issue an interrupt on this condition.
This procedure updates the NCO step until the contents of the virtual
FIFO is zero during the measurement duration.
If ENABLE_NCO_LOOP and AUTO_ACQUI are not set, it is also
possible to set all parameters of the NCO loop through the
microprocessor interface and to run a frequency acquisition fully
controlled by the microprocessor. For monitoring purposes, it is possible
to read the current step and NCO_GAIN using the microprocessor
interface.
2.12.4 Regulation Phase
When the ENABLE_PHASE_LOOP bit is set in the NCO control register
(Register 14, bit 1), the loop starts running a phase compare between
the divided reference and the divided feedback clock. The NCO must set
counters CNT_I and CNT_O according to the rules applied for the other
PLL modes in Registers 7 through 10. The phase loop has a relatively
small gain, which can be adjusted in address 42. The NCO achieves a
phase lock only if the initial frequency is already close to the desired
range.
2.13 Interpolator
In PLL Mode 2, the interpolator retimes the output samples that the
Nyquist filter calculated. The interpolator is clocked with PCLK and
generates the output samples in the PCLK sampling grid. The
interpolator takes the required retiming information from the NCO.
PCLK is at least twice the frequency of the original OCLK obtained by
the formula for PLL Mode 1. The square-root raised cosine filter also
compensates for the sin(x)/x frequency characteristic of the digital-to-
analog converter with the faster sampling grid.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L64825 | Non-VGA Video Controller |
| L64845 | 64-Bit Graphics (GUI) Accelerator |
| L64850GC-25 | DRAM Controller |
| L64850GC-33 | DRAM Controller |
| L64850GC-40 | DRAM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L64780 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:L64780 DVB-T COFDM Demodulator technical manual 2/00 |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。