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EVB72035-315-FM-A Datasheet(PDF) 6 Page - Melexis Microelectronic Systems

Part # EVB72035-315-FM-A
Description  868/915MHz FSK/ASK Transmitter Evaluation Board Description
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Manufacturer  MELEXIS [Melexis Microelectronic Systems]
Direct Link  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

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EVB72035
868/915MHz FSK/ASK Transmitter
Evaluation Board Description
39012 72035 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 TH72035 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


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