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TH72032 Datasheet(PDF) 6 Page - Melexis Microelectronic Systems |
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TH72032 Datasheet(HTML) 6 Page - Melexis Microelectronic Systems |
6 / 20 page TH72032 868/915MHz ASK Transmitter 3901072032 Page 6 of 20 Data Sheet Rev. 011 Jun/12 2.7 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 2.8 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 frequency within the time duration ton. After successful PLL lock, the LOCK signal turns on the power amplifier, and then the RF carrier can be ASK modulated. Fig. 4: Timing diagram for ASK modulation low low high high LOCK ASKDTA RF carrier t low high ENTX t on |
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