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MC13224V 数据表(PDF) 7 Page - Freescale Semiconductor, Inc |
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MC13224V 数据表(HTML) 7 Page - Freescale Semiconductor, Inc |
7 / 48 page MC13224V Product Preview, Rev. 1.0 Freescale Semiconductor 7 2.4.1 RF Interface and Usage The MC13224V RF interface provides for a single-ended, 50- Ω port that connects directly to an antenna. There is an onboard balun that converts the single-ended interface to a full differential, bi-directional, on-chip interface with transmit/receive switch, LNA, and complementary PA outputs. The required port impedance matching is also onboard. This combination allows for a very small footprint and a very low cost RF solution. The receiver demodulator includes a module called the Differential Chip Detector which has two modes of operation: • Non-coherent Detection (NCD) with automatic frequency control (AFC) • Non-coherent Differential Chip Detection (DCD) without AFC The IEEE 802.15.4 standard allows a maximum clock drift of ±40 ppm (which equals ±80 ppm station-to-station). The MC13224V 802.15.4 demodulator includes two different methods of operating in the presence of such large frequency errors: NCD Mode Provides an increased ~3.5 dB of sensitivity. However, the addition of the AFC increases the demodulator current drain about 3-4 mA. DCD Mode RX performance loses ~3.5 dB of sensitivity. For longer range applications where external amplification may be desired (LNA and/or PA), additional ports are provided for secondary complementary PA outputs. These can be used as a separate PA interface while the single-ended port through the balun is used as an input only. Also, four control pins and a regulated 20mA voltage source are provided to control external components and supply power to the PA outputs. The RF Interface functionality can be summarized as follows: • Programmable output power — 0 dBm nominal output power, programmable from -30 to +4 dBm • Receive sensitivity (at 1% PER, 20-byte packet) - — < -96 dBm (typical) DCD receive (well above IEEE 802.15.4 specification of -85 dBm) — < -100 dBm (typical) NCD receive (higher current) • Single-ended 50- Ω antenna port — Uses integrated transmit/receive (T/R) switch, LNA, and onboard balun. Impedance matching onboard. • Maximum flexibility — The optional single-ended port becomes RF input only and a separate set of full differential PA outputs are provided. Separate input and outputs allow for a variety of RF configurations including external LNA and PA for increased range • Four control signals for external RF components such as a LNA or PA • Regulated voltage source for PA biasing and powering external components 2.4.2 Modem The modem supports the full requirement of the IEEE 802.15.4 Standard to transmit and receive data packets. In additional, the mechanism is present to measure received signal level to provide CCA, ED, and LQI as required by the 802.15.4 Standard. |
类似零件编号 - MC13224V |
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类似说明 - MC13224V |
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