參數(shù)資料
型號(hào)： 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(fèi)，6.1 GHz雙分?jǐn)?shù)N頻率合成器
文件頁(yè)數(shù)： 7/20頁(yè)
文件大小： 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
101216G Skyworks Proprietary and Confidential information Products and Product Information are Subject to Change Without Notice July 22, 2004
7
Case 2
: To achieve a desired F
frequency of 5217.1776 MHz using a crystal frequency of 19.2 MHz with operation
of the synthesizer in 10-bit mode. Since the maximum internal reference frequency (F
div_ref
) is 25 MHz, the crystal
frequency does not require the internal division to be greater than 1, which makes F
div_ref
= 19.2 MHz. Therefore:
Nfractional = Fvco_main
4 × Fdiv_ref
= 5217.1776
4 × 19.2
=
67.9320
The value to be programmed in the Main Divider Register is:
Nreg= Round[Nfractional] – 32
= Round[67.9320] – 32
= 68 – 32
= 36 (decimal)
= 000100100(binary)
With the modulator in 10-bit mode, the value to be programmed in the Main Dividend Registers is:
dividend = Round[divider × (Nfractional – Nreg – 32)]
= Round[1024 × (67.9320 – 36 – 32)]
= Round[1024 × (– 0.068)]
= Round[– 69.632]
= –70 (decimal)
= 1110111010 (binary)
where 11 1011 1010 is loaded in the MSB of the Main Dividend Register.
Summary:
·
Main Divider Register = 0 0010 0100
·
Main Dividend MSB Register = 11 1011 1010
·
The resulting main VCO frequency is 5217.15 MHz
Note: The frequency step size for this case is 4 × 19.2 MHz divided by 2
10
, giving 75 kHz.
C1450
Figure 4. Fractional-N Applications: Sample Calculation (2 of 2)
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