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CX74038-12 데이터시트(PDF) 6 Page - Skyworks Solutions Inc. |
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CX74038-12 데이터시트(HTML) 6 Page - Skyworks Solutions Inc. |
6 / 12 page DATA SHEET • CX74038 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 6 January 31, 2005 • Skyworks Proprietary and Confidential information • Products and product information are subject to change without notice • 101075I Case 2: To achieve a desired FVCO_RF frequency of 1400 MHz using a crystal frequency of 13 MHz with operation of the synthesizer in RF mode using the 8/9 prescaler (PS = 0). The crystal frequency does not need to be divided further, since the maximum comparison frequency is 15 MHz. Divide the operating frequency by the internal reference frequency to determine the value of NTotal: NTotal = 1400 MHz 13 MHz =107.6923076 Subtract 3.5 from NTotal and remove the fractional portion of the result to determine N1: 107.6923076 – 3.5 = 104.1923076 N1 = 104 (decimal) Fractional portion = 0.1923076 (decimal) N1 = 000001101000 (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: 0.1923076 × 256 = 49.230746 FN = 49 (decimal) FN = 00110001 (binary) D9 -------D2 Register Address 112 Divide FN by 256 to determine the actual fractional portion: 49 = 0.1914962 256 Subtract this result from the fractional portion of N1: 0.1923076 – 0.1914062 = 0.0009014 Multiply this result by 2097152 (the 21-bit ∆Σ modulator value 221) and remove the fractional portion to determine the ME: 0.0009014 × 2097152 = 1890.3728 ME = 1890 (decimal) ME = 0011101100010 (binary) D21 --------------D9 Register Address 012 In this example, N1 is greater than 64, the minimum divide ratio for the 8/9 prescaler. C1455 Figure 5. Fractional-N Applications: Sample Calculation (2 of 2) |
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