The RF105, a fully integrated transceiver device, provides the transmit, receive, and frequency synthesis functions for Digital Spread Spectrum (DSS) systems operating in the 902–928 MHz Industrial, Scientific, and Medical (ISM) band. It implements a direct conversion architecture and Time Division Duplexing (TDD) of the transmit and receive signals to minimize circuit complexity.

FEATUREs
• Complete 900 MHz ISM band transceiver with fully integrated synthesizer and VCO including resonator
• Low power dissipation
• Fast settling from standby mode to active mode
• Separate enable lines for transmit, receive, and synthesizer
• 41 programmable channels with 600 kHz channel spacing
• 3-battery cell operation (2.7–4.5 V)
• 48-pin TQFP package (see Figure 2)

APPLICATIONs
• DSS cordless telephone
• Direct sequence spread spectrum systems
• Frequency hopping spread spectrum systems
• Wireless LANs
• Wireless modems
• Wireless security
• Inventory control systems