TH72035KLD Melexis Inc, TH72035KLD Datasheet - Page 6

• Manufacturer Part Number: TH72035KLD
• Description: TRANSMITTER, FSK/ASK, 433MHZ, 10QFN
• Manufacturer: Melexis Inc

Specifications of TH72035KLD

• Transmitting Current: 17.3mA
• 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: RoHS Compliant
• Output Power: 9.5dBm
• Rohs Compliant: Yes

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.
2.9 Timing Diagrams
After enabling the transmitter by the ENTX 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.
39010 72035
Rev. 009
RF carrier
FSKDTA
LOCK
ENTX
high
high
high
low
low
low
t
on
Fig. 5:
on
. After successful PLL lock, the LOCK signal turns on the power amplifier,
Timing diagrams for FSK and ASK modulation
Page 6 of 20
t
ASKDTA
ENTX
LOCK
ENTX
0
1
high
high
high
low
low
low
TX standby
TX active
t
on
Mode
FSK/ASK Transmitter
TH72035
868/915MHz
Description
TX disabled
TX enable
Data Sheet
March/08
on
, the
t