Description
The Si4136 is a monolithic integrated circuit that performs both IF and RF synthesis for wireless communications applications. The Si4136 includes three VCOs, loop filters, reference and VCO dividers, and phase detectors. Divider and powerdown settings are programmable through a three-wire serial interface.

Features
■ Dual-band RF synthesizers
    ● RF1: 2300 MHz to 2500 MHz
    ● RF2: 2025 MHz to 2300 MHz
■ IF synthesizer
 ● 62.5 MHz to 1000 MHz
■ Integrated VCOs, loop filters, varactors, and resonators
■ Minimal external components required
■ Low phase noise
■ 5 µA standby current
■ 25.7 mA typical supply current
■ 2.7 V to 3.6 V operation
■ Packages: 24-pin TSSOP, 28-lead QFN
    ● Lead-free/RoHS-compliant options available

Applications
■ ISM and MMDS band communications
■ Wireless LAN and WAN
■ Dual-band communications