TH72012 datasheet(6/20 Pages) MELEXIS

No. de pieza	TH72012

Descripción Electrónicos	433MHz ASK Transmitter

PDF	20 Pages

Scroll/Zoom	100%

Fabricante Electrónico	MELEXIS [Melexis Microelectronic Systems]

Página de inicio	http://www.melexis.com

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6 / 20 page

TH72012

433MHz

ASK Transmitter

39010 72012

Page 6 of 20

Data Sheet

Rev. 009

July/06

2.7

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

TX standby

TX disabled

TX active

TX enable

2.8

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 modulated.

Fig. 5:

Timing diagram for ASK modulation

low

high

LOCK

ASKDTA

RF carrier

low

high

ENTX

t on

TH72012 Datasheet(PDF) 6 Page - Melexis Microelectronic Systems