參數(shù)資料
型號(hào)： KB8821
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： Tantalum Molded Capacitor; Capacitance: 10uF; Voltage: 35V; Case Size: 3.2x6 mm; Packaging: Tape & Reel
中文描述： 頻率合成器
文件頁(yè)數(shù)： 15/21頁(yè)
文件大?。?/td> 237K
代理商： KB8821
PRELIMINARY SPECIFICATION (V1.5)
FREQUENCY SYNTHESIZER
KB8821/22/23
15
99-06-15
FUNCTIONAL DESCRIPTION
- Continued
Powerdown mode operation
There are synchronous and asynchronous powerdown modes for KB8821/22/23.
Synchronous powerdown mode occurs if R18 bit is LOW, N20 bit is HIGH and charge pump output is in high
impedance state. In the synchronous power down mode, the powerdown function is activated by the charge
pump to diminish unwanted frequency jumps. Asynchronous powerdown mode occurs if R18 bit is HIGH and
N20 bit is HIGH.
When the PLL goes to either synchronous or asynchronous powerdown mode, preamp becomes debiased, R &
N counters keeps their load conditions and the charge pump becomes high impedance state. The oscillator cir-
cuitry function becomes disabled only when both IF and RF powerdown bits are activated, i.e. N20 HIGH.
The PLL returns to an active powerup mode when N20 bit becomes LOW(either in synchronous or asynchronous
modes).
Phase Detector and Charge pump Characteristics
Phase difference detection range : -2
π
~ +2
π
When R16 = HIGH
R18
N20
Powerdown mode status
0
0
PLL active
1
0
PLL active, only charge pump high impedance
0
1
Synchronous powerdown
1
1
Asynchronous powerdown
fr
fp
LD
fr>fp
fr=fp
fr<fp
fr<fp
fr<fp
CPo
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
KB8822 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FREQUENCY SYNTHESIZER
KB8823 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FREQUENCY SYNTHESIZER
KB8825 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:1.1GHZ DUAL PLL
KB8C5 制造商:IDEC Corporation 功能描述:DISTR. BOX/SIST. DI DISTR.
KB8D 制造商:IDEC Corporation 功能描述:DISTR. BOX/SIST. DI DISTR.
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