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CX72302 Scheda tecnica(PDF) 10 Page - List of Unclassifed Manufacturers |
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CX72302 Scheda tecnica(HTML) 10 Page - List of Unclassifed Manufacturers |
10 / 20 page DATA SHEET • CX72302 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 10 July 22, 2004 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 101216G C1418 A3 A2 A1 A0 11 10 9 8 7 6 5 4 3 2 1 0 00 01 X X MSB LSB Main Synthesizer Dividend (MSBs) Figure 7. Main Dividend MSB Register (Write Only) A3 A2 A1 A0 11 10 9 8 7 6 5 4 3 2 1 0 00 10 X X X X MSB LSB Main Synthesizer Dividend (LSBs) C1419 Figure 8. Main Dividend LSB Register (Write Only) A3 A2 A1 A0 11 10 9 8 7 6 5 4 3 2 1 0 00 11 X X X MSB LSB Auxiliary Synthesizer Divider Index C1420 Figure 9. Auxiliary Divider Register (Write Only) Auxiliary Synthesizer Registers. The Auxiliary Divider Register contains the integer portion closest to the desired fractional-N (or integer-N) value minus 32 for the auxiliary synthesizer. This register, in conjunction with the Auxiliary Dividend Register, which controls the fraction offset (from –0.5 to +0.5) allows selection of a precise frequency. As shown in Figure 9, the value to be loaded is: • Auxiliary Synthesizer Divider Index = 9-bit value for the integer portion of the auxiliary synthesizer dividers. Valid values for this register are from 6 to 505 (fractional-N) or from 0 to 511 (integer-N). The Auxiliary Dividend Register controls the fraction part of the desired fractional-N value and allows an offset of –0.5 to +0.5 to the auxiliary integer selected through the Auxiliary Divider Register. As shown in Figure 10, the value to be loaded is: • Auxiliary Synthesizer Dividend = 10-bit value for the dividend for the auxiliary synthesizer. For information on programming and loading order for these registers, refer to the Operation section of this document. General Synthesizer Registers. The Reference Frequency Dividers Register configures the dual-programmable reference frequency dividers for the main and auxiliary synthesizers. The dual-programmable reference frequency dividers provide the reference frequencies to the phase detectors by dividing the crystal oscillator frequency. The lower five bits hold the reference frequency divide index for the main phase detector. The next five bits hold the reference frequency divide index for the auxiliary phase detector. Divide ratios from 1 to 32 are possible for each reference frequency divider (see Tables 2 and 3). As shown in Figure 11, the values to be loaded are: • Main Reference Frequency Divider Index = Desired main oscillator frequency division ratio –1. Default value on power-up is 0, signifying that the reference frequency is not divided for the main phase detector. • Auxiliary Reference Frequency Divider Index = Desired auxiliary oscillator frequency division ratio –1. Default value on power-up is 0, signifying that the reference frequency is not divided for the auxiliary phase detector. |
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