TH71081EDC 查看數據表（PDF） - Melexis Microelectronic Systems

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TH71081EDC

868/915MHz ASK Transmitter / LO Source

Melexis Microelectronic Systems  

Not recommended for new designsTH71081

868/915MHz

ASK Transmitter / LO Source

2 Functional Description

2.1 ASK Modulation

The TH71081 can be ASK-modulated by applying data directly at pin PS/DATA. This turns the PA on and off

and therefore leads to an ASK signal at the output.

2.2 Frequency Modulation

For FM operation an external varactor is required. It simply acts as a pulling capacitor connected in series to

the crystal. Then the analog modulation signal, applied through a series resistor, directly modulates the

XOSC.

2.3 LO Source

Many applications require a stable RF source. For this purpose, the TH71081 can be used without modula-

tion as an easy-to-use, PLL-stabilized, continuous wave (CW) generator.

2.4 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

0

1

Mode

TX standby

TX active

Description

TX disable

TX enable

3901071081

Rev. 009

Page 4 of 12

Data Sheet

May/05

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