TH72016 datasheet(6/16 Pages) MELEXIS

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TH72016

433MHz

FSK/ASK Transmitter

39010 72016

Page 6 of 16

Data Sheet

Rev. 006

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 EN is pulled-down

internally. This guarantees that the whole circuit

is shut down if this pin is left floating.

Mode

Description

TX standby

TX disabled

TX active

CKOUT active

TX / CKOUT

enabled

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.

CKDIV

Clock divider ratio

Clock frequency / fc=433.92MHz

3.39MHz

848kHz

2.10 Timing Diagrams

After enabling the transmitter by the EN 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

RF carrier

low

high

LOCK

FSKDTA

low

high

t on

low

high

LOCK

PSEL

low

high

t on

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