Skyworks SKY73126-31 Voltage-Controlled Oscillator (VCO)/Synthesizer is a fully integrated, high performance signal source for base station transceivers. ¡El device provides low phase-noise performance for 3G base station transceivers and general RF system applications. ¡El SKY73126-31 VCO/Synthesizer is a key building block for high performance radio system designs that require low power and low phase noise. ¡El device provides a fixed 161.92 MHz frequency source output. A 10 MHz or 32 MHz reference clock frequency could be used for this device. ¡El integer-N Phase Locked Loop (PLL), loop filter, VCO, varactor, frequency divider and output buffer are integrated inside the device. An integrated 3.3 V voltage regulator provides superior phase-noise performance. ¡El SKY73126-31 is programmed through a three-wire Serial Peripheral Interface (SPI). ¡El SKY73126-31 VCO/Synthesizer is provided in a compact, 16-pin Multi-Chip Module (MCM). ¡El device package and pinout are shown in Figure 1. A functional block diagram is shown in Figure 2. Signal pin assignments and functional pin descriptions are provided in Table 1. S131412345613121110971415VCCGNDRF_OUTGNDN/CGNDN/CTCXO_INGNDLDLEDATAGNDCLKGNDGND168Figure 1. SKY73126-31 Pinout– 17-Pin MCM Package (Top View)