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SKY73112 Datasheet(PDF) 6 Page - Skyworks Solutions Inc. |
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SKY73112 Datasheet(HTML) 6 Page - Skyworks Solutions Inc. |
6 / 13 page PRELIMINARY DATA SHEET • SKY73112 VCO/SYNTHESIZER Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 6 July 9, 2007 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 200736A N = M × 24 + A = 0101000110b (this is the same as N actual) Multiply the fractional portion that was removed in the previous step by 256 and remove the fractional portion of the result to determine FN: 0.55625 × 256 = 142.4 FN = 142 = 10001110b Divide FN by 256 to determine the actual fractional part, FNactual: FNactual = 142/256 = 0.5546875 Subtract this result from the fractional portion of (DTotal – 3.5) to determine the actual fractional modulus extender, MEactual: MEactual = (DTotal – 3.5 – Nactual) – FNactual = 0.55625 – 0.5546875 = 0.0015625 Multiply this result by 8388608 (the 23-bit ∆Σ modulator value, 223) and remove the fractional portion to determine the value of ME: 0.0015625 × 8388608 = 13107.2 ME = 13107 = 011001100110011b Example 2: A desired synthesizer frequency of 725 MHz is required using a crystal frequency of 13 MHz and an 8/9 prescaler. Since the maximum internal reference frequency is 25 MHz, the crystal frequency does not need to be divided. However, a reference divider ratio of 2 is used for this example. Restating Equation 2 as a function of DTotal: DTotal = (725 × 2)/13 = 111.538461538 Where: RF = 725 R1 = 2 FREF = 13 Determine Nactual by subtracting 3.5 from DTotal and removing the fractional portion: DTotal – 3.5 = 108.038461538 Using Equation 3: Nactual = 108 = Mactual × P + A actual Where: Mactual = 13 P = 8 Aactual = 4 M = Mactual = 13 = 001101b (the six MSBs) A = Aactual = 4 = 0100b (the four LSBs) N = M × 24 + A = 0011010100b (the value programmed) Multiply the fractional portion that was removed in the previous step by 256 and remove the fractional portion of the result to determine FN: 0.038461538 × 256 = 9.846153728 FN = 9 = 00001001b Divide FN by 256 to determine the actual fractional part, FNactual: FNactual = 9/256 = 0.03515625 Subtract this result from the fractional portion of (DTotal – 3.5) to determine the actual fractional modulus extender, MEactual: MEactual = (DTotal – 3.5 – Nactual) – FNactual = 0.038461538 – 0.03515625 = 0.003305288 Multiply this result by 8388608 (the 23-bit ∆Σ modulator value, 223) and remove the fractional portion to determine the value of ME: 0. 003305288 × 8388608 = 27726.7653 ME = 27726 = 110110001001110b Package and Handling Information Since the device package is sensitive to moisture absorption, it is baked and vacuum packed before shipping. Instructions on the shipping container label regarding exposure to moisture after the container seal is broken must be followed. Otherwise, problems related to moisture absorption may occur when the part is subjected to high temperature during solder assembly. The SKY73112 is rated to Moisture Sensitivity Level 3 (MSL3) at 260 °C. It can be used for lead or lead-free soldering. For additional information, refer to Skyworks Application Note, PCB Design and SMT Assembly/Rework Guidelines for MCM-L Packages, document number 101752. Care must be taken when attaching this product, whether it is done manually or in a production solder reflow environment. Production quantities of this product are shipped in a standard tape and reel format. For packaging details, refer to the Skyworks Application Note, Tape and Reel, document number 101568. Circuit Design Considerations The following design considerations are general in nature and must be followed regardless of final use or configuration 1. Paths to ground should be made as short and as low impedance as possible. |
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