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參數(shù)資料
| 型號： | 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)： | 13/22頁 |
| 文件大?。?/td> | 426K |
| 代理商： | S1M8821 |
INTERGER RF/IF DUAL PLL
S1M8821/22/23
13
FUNCTIONAL DESCRIPTION
The Samsung S1M8821/22/23 are dual PLL frequency synthesizer ICs. S1M8821/22/23 combined with external
LPFs and external VCOs form PLL frequency synthesizers. They include serial data control, R counter, N counter,
prescaler, phase detector, charge pump, and etc.
Serial data is moved into 20-bit shift register on the rising edge of the clock. These data enters MSB first. When LE
becomes HIGH, data in the shift register is moved into one of the 4 latches(by the 2-bit control). The divide ratios of
the prescaler and the counters are determined by the data stored in the latches. The external VCO output signal is
divided by the prescaler and the N counter. External reference signal is divided by the R counter. These two signals
are the two input signals to the phase detector. The phase detector drives the charge pump by comparing
frequencies and phases of the above two signals. The charge pump and the external LPF make the control voltage
for the external VCO and finally the VCO generates the appropriate frequency signal.
Serial Data Input Timing
MSB
LSB
N20(R20)
N19(R19)
N10(R10)
N9(R9)
C2
C1
t
DS
t
CWL
t
CWH
t
LEW
t
DH
DATA
CLOCK
LE
t
CLE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| S1M8823X01-R0T0 | INTERGER RF/IF DUAL PLL |
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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