TH72036KLD Melexis Inc, TH72036KLD Datasheet - Page 6

• Manufacturer Part Number: TH72036KLD
• Description: TX, ASK/FSK W/CLOCK, 868/915MHZ, 10QFN
• Manufacturer: Melexis Inc

Specifications of TH72036KLD

• Data Rate: 40Kbps
• Frequency Range: 850MHz To 930MHz
• Modulation Type: ASK, FSK
• Rf Ic Case Style: QFN
• No. Of Pins: 10
• Supply Voltage Range: 1.95V To 5.5V
• Operating Temperature Range: -40°C To
• Output Power: 9.5dBm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 selected by the clock divider control signal CKDIV, according to the following table.
A capacitor at pin CKOUT can be used to control the clock voltage swing and the RF 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.
3901072036
Rev. 006
RF carrier
FSKDTA
LOCK
high
high
high
low
low
low
EN
CKDIV
0
1
t
on
Fig. 5: Timing diagrams for FSK and ASK modulation
on
. After successful PLL lock, the LOCK signal turns on the power amplifier,
Clock divider ratio
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32
8
t
LOCK
PSEL
EN
0
1
high
high
high
low
low
low
EN
CKOUT active
TX standby
TX active
t
on
Mode
Clock frequency / f
FSK/ASK Transmitter
3.39MHz
TH72036
848kHz
868/915MHz
TX / CKOUT
Description
TX disabled
enabled
c
=868.3MHz
Data Sheet
Jun/08
on
, the
t