[SILICON LAB]

Description
The Si4133 is a monolithic integrated circuit that performs both IF and dual band RF synthesis for wireless communications applications. The Si4133 includes three VCOs, loop filters, reference and VCO dividers, and phase detectors. Divider and power-down settings are programmable through a three-wire serial interface.

Features
■ Dual-Band RF Synthesizers
    • RF1: 900 MHz to 1.8 GHz
    • RF2: 750 MHz to 1.5 GHz
■ IF Synthesizer
    • IF: 62.5 MHz to 1000 MHz
■ Integrated VCOs, Loop Filters, Varactors, and Resonators
■ Minimal (2) External Components Required
■ Low Phase Noise
■ Programmable Power Down Modes
■ 1 µA Standby Current
■ 18 mA Typical Supply Current
■ 2.7 V to 3.6 V Operation
■ Packages: 24-Pin TSSOP, 28-Lead MLP

Applications
■ Dual-Band Communications
■ Digital Cellular Telephones GSM, DCS1800, PCS1900
■ Digital Cordless Phones
■ Analog Cordless Phones
■ Wireless LAN and WAN