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EVB72005-915-FSK-A Datasheet(PDF) 6 Page - Melexis Microelectronic Systems |
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EVB72005-915-FSK-A Datasheet(HTML) 6 Page - Melexis Microelectronic Systems |
6 / 14 page EVB72005 315MHz FSK/ASK Transmitter Evaluation Board Description 39012 72005 01 Page 6 of 14 EVB Description Rev. 007 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 ENTX is pulled- down internally. This guarantees that the whole circuit is shut down if this pin is left floating. ENTX Mode Description 0 TX standby TX disabled 1 TX active TX enable 2.9 Timing Diagrams After enabling the transmitter by the ENTX 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 TH72005 data sheet revision. RF carrier low low high high LOCK FSKDTA t low high ENTX t on low low high high LOCK ASKDTA t low high ENTX t on |
Similar Part No. - EVB72005-915-FSK-A |
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Similar Description - EVB72005-915-FSK-A |
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