SKY72300-362 Buy Now
Spur-Free, 2.1 GHz Dual Fractional-N Frequency Synthesizer

The SKY72300-362 direct digital modulation synthesizer is a key building block for high-performance radio system designs that require ultra-fine frequency resolution, fast switching speed, and low phase-noise performance. The fine step size of less than 100 Hz allows this synthesizer to be used in very narrowband wireless applications.

With proper temperature sensing or through control channels, the synthesizer's fine step size can compensate for crystal oscillator or IF filter drift.

The device is programmable through a three-wire, high-speed serial interface. A combination of large bandwidth, fine resolution, and the serial interface allows for a direct frequency modulation of the VCO. This capability eliminates the need for I/Q DACs, quadrature upconverters, and IF filters from the transmitter portion of the radio system.NEW! Skyworks offers lead (Pb)-free, RoHS (Restriction of Hazardous Substances) compliant packaging.

Please note: SKY72300-362 is being discontinued and is not recommended for new design.


  • Spur free operation
  • Dual 2.1 GHz main/RF and 500 MHz auxiliary/IF synthesizer
  • Step size <100 Hz @ 2 GHz
  • Very fast switching speed (below 100 µs)
  • Low phase noise -91 dBc/Hz @ 1800 MHz measured inside the loop bandwidth
Data Sheets SKY72300-362 Spur-Free,2.1 GHz Dual Fractional-N Frequency Synthesizer 200731B.pdf (179 KB)
Application Notes Fine Frequency Control Using the SKY72300,SKY72301,and SKY72302 Dual Synthesizers/PLLs 101266C.pdf (75 KB)
Application Notes Phase Noise Performance of the SKY72300,SKY72301,and SKY72302 Dual Synthesizers/PLLs 101348D.pdf (174 KB)
Application Notes Direct Digital Modulation Using the SKY72300,SKY72301, and SKY72302 Dual Synthesizers/PLLs 101349C.pdf (88 KB)
Application Notes Evaluation and Performance of the SKY72300,SKY72301,SKY72302,and SKY74038 Dual Synthesizers/PLLs 101513D.pdf (300 KB)
Application Notes Performance Issues With The SKY7230x-21 Series of Frequency Synthesizers 200534A.pdf (202 KB)
Designer Info Dual Fractional-N Synthesizers/PLLs Freq Asked Questions 103037C.pdf (228 KB)
Designer Info Low Pass Filter Component Calculator LPF_Component_Calculator.xls (15 KB)
White Paper Basics of Dual Fractional-N Synthesizers/PLLs 101463B.pdf (114 KB)
ProductName : SKY72300-362
Main Synthesizer Frequency (MHz) : 100-2100
Auxiliary Synthesizer Frequency (MHz) : 100-500
Main Synthesizer Phase Noise (dBc/Hz) : -91 @ 1800 MHz
Supply Voltage (V) : 2.7-3.3
Package : QFN, 24-pin
Package (mm) : 4 x 4 x 0.9
Product Information:
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