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參數(shù)資料
| 型號： | L64733C-48 |
| 廠商： | LSI CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | TQFP-48 |
| 文件頁數(shù)： | 45/52頁 |
| 文件大?。?/td> | 552K |
| 代理商： | L64733C-48 |
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L64733C/L64734 Tuner and Satellite Receiver Chipset
5
has 3-state operation (see the “Synthesizer Control Interface” section on
The VCO requires an external resonant tank circuit, which includes
varactor diodes to vary the frequency of oscillation.
The VCO signal is fed to the Prescaler block before being passed
deferentially through the PSOUTp and PSOUTn pins to the L64734. The
L64734 MODp and MODn differential signals control the divider ratio for
the Prescaler block. The L64734 dynamically changes the divide ratio to
ensure that the tuning step size is not affected by the divider. The
L64734 contains programmable counters to further divide the signal
frequency before it is fed back to the L64733C through the PLLINp and
PLLINn pins. The crystal reference oscillator frequency is divided by
eight and fed to the phase detector. The phase detector generates a
current signal proportional to the difference in phase between PLLINp,
PLLINn, and the divided crystal frequency. A charge pump circuit
generates current that controls pins CP and FB, and an external
transistor to buffer the L64733C against the tuning voltage (28 V). The
current is passed through a discrete loop lter and is converted to a
tuning voltage that drives the external varactor diodes for the VCO tank
circuit. A frequency controlled loop is formed. Changing the frequency
divider ratios in the L64734 registers varies the VCO frequency. See
the VCO, crystal oscillator, charge pump, tank circuitry, and
frequency-controlled loop.
The chipset provides maximum integration and exibility for system
designers at a minimum cost. The number of external components
required to build a system is minimal because the synthesizer, variable
rate lters, and clock and carrier loops are integrated into the two
devices.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L64734 | 制造商:LSI 制造商全稱:LSI 功能描述:Tuner and Satellite Receiver Chipset |
| L64734C-45 | 制造商:LSI 功能描述: 制造商:LSI Corporation 功能描述: |
| L64735GM-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Image Processor |
| L64735GM-27 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Image Processor |
| L64735GM-35 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Image Processor |
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