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CX74038-12 데이터시트(PDF) 5 Page - Skyworks Solutions Inc. |
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CX74038-12 데이터시트(HTML) 5 Page - Skyworks Solutions Inc. |
5 / 12 page DATA SHEET • CX74038 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 101075I • Skyworks Proprietary and Confidential information • Products and product information are subject to change without notice • January 31, 2005 5 Case 1: To achieve a desired FVCO_RF frequency of 2440.2 MHz using a crystal frequency of 24 MHz with operation of the synthesizer in RF mode using the 16/17 prescaler (PS = 1). R1 is set to divide by 3 to achieve a comparison frequency of 8 MHz, since the maximum internal reference frequency is 9 MHz. Divide the operating frequency by the internal reference frequency to determine the value of NTotal: NTotal = 2440.2 MHz 8 MHz = 305.025 Subtract 3.5 from NTotal and remove the fractional portion of the result to determine N1: 305.025 – 3.5 = 301.525 N1 = 301 (decimal) Fractional portion = 0.525 (decimal) N1 = 000100101101 (binary) D21 -----------D10 Register Address 112 Multiply the fractional portion of N1 by 256 and remove the fractional portion of the result to determine FN: 0.525 × 256 = 134.4 FN = 134 (decimal) FN = 10000110 (binary) D9 -------D2 Register Address 112 Divide FN by 256 to determine the actual fractional portion: 134 = 0.5234375 256 Subtract this result from the fractional portion of N1: 0.525 – 0.5234375 = 0.0015625 Multiply this result by 2097152 (the 21-bit ∆Σ modulator value 221) and remove the fractional portion to determine the ME: 0.0015625 × 2097152 = 3276.8 ME = 3276 (decimal) ME = 0110011001100 (binary) D21 --------------D9 Register Address 012 In this example, N1 is greater than 256, the minimum divide ratio for the 16/17 prescaler. C1454 Figure 5. Fractional-N Applications: Sample Calculation (1 of 2) |
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