WLAN Chipset with Low Power Consumption
The chipset will comply to the new IEEE802.11 High Rate standard, now awaiting final approval. PRISM II can downshift to slower data rates (5.5, 2 or 1 Mbps) when necessary for maintain link integrity or when operating with legacy 802.11-compliant 1 or 2 Mbps systems.
The four ICs required in PRISM II-based system also integrate other functions that were previously handled by separate components on the board. The chipset's five ICs implement a complete data communications radio operating in the 2.4 GHz ISM band at speeds up to 11 Mbps. From the antenna, the four chips in the PHY later include: the Power Amplifier and Detector (HFA3983), the RF-to-IF Converter (HFA3683), the I/Q Modulator/Demodulator and Synthesizer (HFA3783), and a Direct Sequence Spread Spectrum Baseband Processor (HFA3861). The HFA3841 comprises the MAC layer and is the interface between the physical layer and the host computer.