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參數(shù)資料
| 型號： | SKY72310-362LF |
| 廠商： | Skyworks Solutions Inc |
| 文件頁數(shù)： | 15/19頁 |
| 文件大小： | 0K |
| 描述： | IC SYNTHESIZER 2.1GHZ 24-QFN |
| 產(chǎn)品目錄繪圖： | 24-QFN |
| 標準包裝： | 1 |
| 類型： | 分數(shù) N 合成器（RF） |
| PLL： | 是 |
| 輸入： | 時鐘，晶體 |
| 輸出： | 時鐘，晶體 |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:2 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 2.1GHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 2.7 V ~ 3.3 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 24-QFN 裸露焊盤（4x4） |
| 包裝： | 標準包裝 |
| 產(chǎn)品目錄頁面： | 587 (CN2011-ZH PDF) |
| 其它名稱： | 863-1080-6 |
DATA SHEET SKY72310 FREQUENCY SYNTHESIZER
Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
200705E Skyworks Proprietary and Confidential information Products and Product Information are Subject to Change Without Notice July 30, 2008
5
Case 1: To achieve a desired Fvco_main frequency of 902.4530 MHz using a crystal frequency of 40 MHz with operation
of the synthesizer in 18-bit mode. Since the maximum internal reference frequency (Fdiv_ref) is 25 MHz, the crystal
frequency is divided by 2 to obtain a Fdiv_ref of 20 MHz. Therefore:
Nfractional
=
Fvco_main
Fdiv_ref
= 902.4530
20
= 45.12265
The value to be programmed in the Divider Register is:
Nreg
= Round[Nfractional] – 32
= Round[45.12265] – 32
= 45 – 32
= 13 (decimal)
= 000001101 (binary)
With the modulator in 18-bit mode, the value to be programmed in the Dividend Registers is:
dividend = Round[divider × (Nfractional – Nreg – 32)]
= Round[262144 × (45.12265 – 13 – 32)]
= Round[262144 × (0.12265)]
= Round[32151.9616]
= 32152 (decimal)
= 000111110110011000 (binary)
where 00 0111 1101 is loaded in the Dividend MSB Register and 1001 1000 is loaded in the Dividend LSB Register.
Summary:
Divider Register = 0 0000 1101
Dividend LSB Register = 1001 1000
Dividend MSB Register = 00 0111 1101
The resulting VCO frequency is 902.453 MHz
Step size is 76.3 Hz
Note: The frequency step size for this case is 20 MHz divided by 218, giving 76.3 Hz.
S1059
Figure 4. Fractional-N Applications: Sample Calculation (1 of 2)
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