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參數(shù)資料
| 型號： | CX72302 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | CX72302: Spur-Free, 6.1 GHz Dual Fractional-N Frequency Synthesizer |
| 中文描述： | CX72302：支線，免費，6.1 GHz雙分數(shù)N頻率合成器 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 162K |
| 代理商： | CX72302 |
DATA SHEET CX72302
Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
July 22, 2004 Skyworks Proprietary and Confidential information Products and Product Information are Subject to Change Without Notice 101216G
6
Case 1
: To achieve a desired F
frequency of 5900.4530 MHz using a crystal frequency of 40 MHz with operation
of the synthesizer in 18-bit mode. Since the maximum internal reference frequency (F
div_ref
) is 25 MHz, the crystal
frequency is divided by 2 to obtain a F
div_ref
of 20 MHz. Therefore:
Nfractional = Fvco_main
4 × Fdiv_ref
= 5900.4530
80
= 73.755663
The value to be programmed in the Main Divider Register is:
Nreg= Round[Nfractional] – 32
= Round[73.755663] – 32
= 74 – 32
= 42 (decimal)
= 000101010(binary)
With the modulator in 18-bit mode, the value to be programmed in the Main Dividend Registers is:
dividend = Round[divider × (Nfractional – Nreg – 32)]
= Round[262144 × (73.755663 – 42 – 32)]
= Round[262144 × (–0.2443375)]
= Round[–64051.6096]
= –64052 (decimal)
= 110000010111001100 (binary)
where 11 0000 0101 is loaded in the MSB of the Main Dividend Register and 11001100 is loaded in the LSB of the
Main Dividend Register.
Summary:
·
Main Divider Register = 0 0010 1010
·
Main Dividend LSB Register = 1100 1100
·
Main Dividend MSB Register = 11 0000 0101
·
The resulting main VCO frequency is 5900.4529 MHz
Note: The frequency step size for this case is 4 × 20 MHz divided by 2
18
, giving 305.2 Hz.
C1449
Figure 4. Fractional-N Applications: Sample Calculation (1 of 2)
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