TH71221 datasheet(16/44 Pages) MELEXIS

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TH71221

27 to 930MHz

FSK/FM/ASK Transceiver

39010 071221

Page 16 of 44

Data Sheet

Rev. 005

June/07

RPS / kOhm

-40.00

-30.00

-20.00

-10.00

0.00

10.00

100

20.00

315MHz

433MHz

868MHz

915MHz

3.3.2

Output Power Adjustment

The maximum output power is adjustable via

the external resistor RPS as shown in Figure

8. There are four predefined power settings

in programmable user mode which can be

set in the register TXPOWER. The maxi-

mum power setting P4 is the default setting.

Fig. 8:

Output power vs. RPS

3.3.3

Modulation Schemes

The RF carrier generated by the PLL frequency synthesizer can be ASK or FSK modulated. Depending on

the selected user mode, the modulation type can be selected either by the ASK/FSK pin or via the serial

control interface. Data is applied to pin IN_DTA. The data signal can be inverted by the bit DTAPOL. The

following tables for ASK and FSK modulation are valid for non-inverted data (DTAPOL = 0)

3.3.4

ASK Modulation

IN_DTA

Description

Power amplifier is turned off

Power amplifier is turned on

(according to the selected output power)

The transceiver is ASK-modulated by

turning on and off the power amplifier.

Please also refer to para. 1.3 for ASK

modulation limits.

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