EVB72016 Melexis Company, EVB72016 Datasheet - Page 6

• Manufacturer Part Number: EVB72016
• Description: 433mhz Fsk/ask Transmitter Evaluation Board Description
• Manufacturer: Melexis Company

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.
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.
2.10 Timing Diagrams
After enabling the transmitter by the EN signal, the power amplifier remains inactive for the time t
transmitter start-up time. The crystal oscillator starts oscillation and the PLL locks to the desired output fre-
quency within the time duration t
and then the RF carrier can be FSK or ASK modulated.
3901272016 01
Rev. 004
RF carrier
FSKDTA
For more detailed information, please refer to the latest TH72016 data sheet revision.
LOCK
high
high
high
low
low
low
EN
CKDIV
0
1
t
on
Fig. 5:
on
. After successful PLL lock, the LOCK signal turns on the power amplifier,
Timing diagrams for FSK and ASK modulation
Clock divider ratio
Page 6 of 12
16
4
t
LOCK
PSEL
EN
0
1
high
high
high
low
low
low
EN
433MHz FSK/ASK Transmitter
Evaluation Board Description
CKOUT active
TX standby
TX active
t
Clock frequency / f
on
Mode
EVB72016
3.39 MHz
848 kHz
EVB Description
TX / CKOUT
Description
TX disabled
c
enabled
=433.92 MHz
on
, the
June/07
t