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參數資料
| 型號： | WB1225 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Serial Input PLL with 2.5-GHz Prescaler(帶2.5-GHz 預標定器的串聯輸入PLL) |
| 中文描述： | 串行輸入鎖相環2.5 - GHz的預分頻器（帶2.5 - GHz的預標定器的串聯輸入鎖相環） |
| 文件頁數： | 6/9頁 |
| 文件大小： | 141K |
| 代理商： | WB1225 |
WB1225
6
Timing Waveforms
Phase Characteristics
Phase Detector Output Waveform
D
O
Charge Pump Output Current Waveform
VCO Input Voltage
Phase Comparator Sense
VCO
Output
Frequency
divider output, F
r
. When FC is set LOW, F
out
pin is set to the programmable
divider output F
p
.
When FC is set HIGH or OPEN CIRCUIT, F
out
pin is set to the reference
(2)
(1)
For normal operation, the FC pin is used to select the output polarity of the
phase detector. Both the internal and any external charge pump are affected.
Depending upon VCO characteristics, FC pin should be set accordingly:
When VCO characteristics are like (1), FC should be set HIGH or OPEN
CIRCUIT:
When VCO characteristics are like (2), FC should be set LOW.
tw
tw
F
R
F
P
LD
tw
tw
F
R
F
P
ID
O
Three-state
D
o
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