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參數資料

型號：	L64733C-44
廠商：	LSI CORP
元件分類：	消費家電
英文描述：	SPECIALTY CONSUMER CIRCUIT, PQCC44
封裝：	7 X 7 MM, 0.90 MM HEIGHT, QFN-44
文件頁數：	45/52頁
文件大小：	552K
代理商：	L64733C-44

L64733C/L64734 Tuner and Satellite Receiver Chipset

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

Figure 7, on page 23, for more details regarding the external circuitry for

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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相關代理商/技術參數	參數描述
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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