Datasheet > TH72005_12

TH72005_12

更新时间： 2022-02-26 12:04:55

品牌	Logo	应用领域
迈来芯 - MELEXIS		/
页数	文件大小	规格书
20页	850K
描述
FSK/ASK Transmitter

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数据手册

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TH72005_12 数据手册

TH72005

315MHz

FSK/ASK Transmitter

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.

ENTX

Mode

Description

TX disabled

TX enable

TX standby

TX active

2.9 Timing Diagrams

After enabling the transmitter by the ENTX signal, the power amplifier remains inactive for the time t_on, the

transmitter start-up time. The crystal oscillator starts oscillation and the PLL locks to the desired output

frequency within the time duration t_on. After successful PLL lock, the LOCK signal turns on the power

amplifier, and then the RF carrier can be FSK or ASK modulated.

high

ENTX

low

high

ENTX

low

high

LOCK

low

high

FSKDTA

low

high

ASKDTA

low

RF carrier

Fig. 5: Timing diagrams for FSK and ASK modulation

3901072005

Rev. 011

Page 6 of 20

Data Sheet

Jul/12

1...3 4 567 8 9...20

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