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參數(shù)資料
| 型號(hào)： | S1M8821 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | INTERGER RF/IF DUAL PLL |
| 中文描述： | 整數(shù)射頻/中頻雙鎖相環(huán) |
| 文件頁數(shù)： | 18/22頁 |
| 文件大?。?/td> | 426K |
| 代理商： | S1M8821 |
S1M8821/22/23
INTERGER RF/IF DUAL PLL
18
FUNCTIONAL DESCRIPTION
(Continued)
Powerdown mode operation
There are synchronous and asynchronous powerdown modes for S1M8821/22/23.
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 circuitry
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
to +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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| S1M8821X01-R0T0 | INTERGER RF/IF DUAL PLL |
| S1M8822 | INTERGER RF/IF DUAL PLL |
| S1M8822X01-R0T0 | INTERGER RF/IF DUAL PLL |
| S1M8823 | INTERGER RF/IF DUAL PLL |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S1M8821X01-R0T0 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:INTERGER RF/IF DUAL PLL |
| S1M8822 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:INTERGER RF/IF DUAL PLL |
| S1M8822X01-R0T0 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:INTERGER RF/IF DUAL PLL |
| S1M8823 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:INTERGER RF/IF DUAL PLL |
| S1M8823X01-R0T0 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:INTERGER RF/IF DUAL PLL |
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