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SKY73112-11 Datasheet(PDF) 2 Page - Skyworks Solutions Inc. |
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SKY73112-11 Datasheet(HTML) 2 Page - Skyworks Solutions Inc. |
2 / 13 page DATA SHEET • SKY72300-362 FREQUENCY SYNTHESIZER Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 2 July 30, 2007 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 200731B The unit operates with a three-wire, high-speed serial interface. A combination of large bandwidth, fine resolution, and the three- wire, high-speed serial interface allows for a direct frequency modulation of the VCO. This supports any continuous phase, constant envelope modulation scheme such as Frequency Modulation (FM), Frequency Shift Keying (FSK), Minimum Shift Keying (MSK), or Gaussian Minimum Shift Keying (GMSK). This capability can eliminate the need for In-phase and Quadrature (I/Q) Digital-to-Analog Converters (DACs), quadrature upconverters, and IF filters from the transmitter portion of the radio system. Figure 1 shows a functional block diagram for the SKY72300-362. The device package and pinout for the 24-pin Quad Flat No-Lead (QFN) package are shown in Figure 2. Serial Interface Modulation Unit Main Divider Auxiliary Divider Fvco_aux Fvco_aux Fvco_main Fpd_main Fpd_aux Fref_main Fref_aux Fref CPout_aux CPout_main LD/PSmain LD/PSaux Fvco_main Reference Frequency Oscillator Reference Frequency Oscillator Main Phase/Freq. Detector and Charge Pump Auxiliary Phase/Freq. Detector and Charge Pump Main Divider Auxiliary Prescaler Data Mux Mod_in Mux_out Clock CS Fractional Unit Fractional Unit ΔΣ 18-Bit ΔΣ 10-Bit Registers Modulation Data Main Divider Modulation Control Ref Freq Dividers PD/Charge Pump & Pwr-Dn/Mux Out Control Aux Divider Main MSB/LSB Dividend Aux Dividend Lock Detection or Power Steering Lock Detection or Power Steering C1447 Figure 1. SKY72300-362 Functional Block Diagram |
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