參數(shù)資料
型號: LMX9820ASMX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 通信及網(wǎng)絡
英文描述: Bluetooth Serial Port Module
中文描述: SPECIALTY TELECOM CIRCUIT, PBGA116
封裝: 10.10 X 14.10 MM, 2 MM HEIGHT, LGA-116
文件頁數(shù): 19/44頁
文件大?。?/td> 579K
代理商: LMX9820ASMX
Revision 1.0
19
www.national.com
L
8.0 Digital Smart Radio
(Continued)
Figure 11. Crystal Equivalent Circuit
2. Crystal Pullability
Pullability is another important parameter for a crystal,
which is the change in frequency of a crystal with units of
ppm/pF, either from the natural resonant frequency to a
load resonant frequency or from one load resonant fre-
quency to another. The frequency can be pulled in a paral-
lel resonant circuit by changing the value of load
capacitance. A decrease in load capacitance causes an
increase in frequency, and an increase in load capacitance
causes a decrease in frequency.
3. Frequency Tuning
Frequency tuning is achieved by adjusting the crystal load
capacitance with external capacitors. It is a Bluetooth
requirement that the frequency is always within 20 ppm.
The crystal network or oscillator must have cumulative
accuracy specifications of
15 ppm
to provide margin for
frequency drift with aging and temperature.
R1
C1
L1
C0
相關PDF資料
PDF描述
LMX9820A Bluetooth Serial Port Module
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