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參數(shù)資料
| 型號： | LMX2604LQX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | Triple-band VCO for GSM900/DCS1800/PCS1900 |
| 中文描述： | VCO, 880 MHz - 915 MHz |
| 封裝： | LLP-20 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 268K |
| 代理商： | LMX2604LQX |
Functional Description
(Continued)
FREQUENCY ACQUISITION
On the rising edge of CE the VCO goes through a frequency
acquisition mode which coarse locks the PLL to the approxi-
mate final frequency. This portion of the lock digitally sets the
frequency such that the final tuning voltage on the CPin line
of the VCO is approximately Vdd/2. Benefits of this system is
the maximum required charge pump voltage is reduced as
large frequency ranges may be tuned with a small tuning
voltage. This makes the digitally tuned VCO different from
conventional analog VCOs.
Frequency Acquisition Timing Diagram
20066122
L
www.national.com
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