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EVB72036-868-FSK-C Datasheet(PDF) 6 Page - Melexis Microelectronic Systems |
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EVB72036-868-FSK-C Datasheet(HTML) 6 Page - Melexis Microelectronic Systems |
6 / 12 page PR EL IM INA RY EVB72036 868/915MHz FSK/ASK Transmitter Evaluation Board Description 3901272036 01 Page 6 of 12 EVB Description Rev. 002 June/07 2.8 Mode Control Logic The mode control logic allows two different modes of operation as listed in the following table. The mode control pin EN is pulled-down internally. This guarantees that the whole circuit is shut down if this pin is left floating. EN Mode Description 0 TX standby TX disabled 1 TX active CKOUT active TX / CKOUT enabled 2.9 Clock Output The clock output CKOUT is CMOS-compatible and can be used to drive a microcontroller. The frequency of the clock can be changed by the clock divider control signal CKDIV, that can be selected according to the following table. A capacitor at pin CKOUT can be used to control the clock voltage swing and the spurious emission. CKDIV Clock divider ratio Clock frequency / fc=433.92 MHz 0 4 3.39 MHz 1 16 848 kHz 2.10 Timing Diagrams After enabling the transmitter by the EN signal, the power amplifier remains inactive for the time ton, the transmitter start-up time. The crystal oscillator starts oscillation and the PLL locks to the desired output fre- quency within the time duration ton. After successful PLL lock, the LOCK signal turns on the power amplifier, and then the RF carrier can be FSK or ASK modulated. Fig. 5: Timing diagrams for FSK and ASK modulation For more detailed information, please refer to the latest TH72036 data sheet revision. RF carrier low low high high LOCK FSKDTA t low high EN t on EN low low high high LOCK PSEL t low high t on |
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