外文翻译--单片MHZ无线收发器NRF905.doc

Single chip 433/868/915 MHz Transceiver nRF905 FEATURES ??True single chip GFSK transceiver in a small 32-pin package (32L QFN 5x5mm) ??ShockBurst? mode for low power operation ??Power supply range 1.9 to 3.6 V ??Multi channel operation – ETSI/FCC Compatible ??Channel switching time 650?s ??Extremely low cost Bill of Material (BOM) ??No external SAW filter ??Adjustable output power up to 10dBm ??Carrier detect for listen before transmit protocols ??Data Ready signal when a valid data package is received or transmitted ??Address Match for detection of incoming package ??Automatic retransmission of data packages ??Automatic CRC and preamble generation APPLICATIONS ??Wireless data communication ??Alarm and security systems ??Home Automation ??Remote control ??Surveillance ??Automotive ??Telemetry ??Industrial sensors ??Keyless entry ??Toys GENERAL DESCRIPTION nRF905 is a single-chip radio transceiver for the 433/868/915 MHz ISM band. The transceiver consists of a fully integrated frequency synthesiser, receiver chain with demodulator, a power amplifier, a crystal oscillator and a modulator. The ShockBurstTM feature automatically handles preamble and CRC. Configuration is easily programmable by use of the SPI interface. Current consumption is very low, in transmit only 11mA at an output power of -10dBm, and in receive mode 12.5mA. Built in power down modes makes power saving easily realizable. MODES OF OPERATION The nRF905 has two active (RX/TX) modes and two power-saving modes ACTIVE MODES ??ShockBurst? RX ??ShockBurst? TX POWER Saving Modes ??Power down and SPI - programming ??Standby and SPI - programming The nRF905 mode is decided by the settings of TRX_CE, TX_EN and PWR_UP. nRF ShockBurst? Modes The nRF905 uses the Nordic VLSI ShockBurst? feature. ShockBurstTM makes it possible to use the high data rate offered by the nRF905 without the need of a costly, high-speed micro controller (MCU) for data processing/clock recovery. By placing all high sp