TH7108 데이터 시트보기 (PDF) - Melexis Microelectronic Systems

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TH7108

868/915MHz FSK/FM/ASK Transmitter

Melexis Microelectronic Systems  

TH7108

868/915MHz

FSK/FM/ASK Transmitter

Features

! Fully integrated, PLL-stabilized VCO

! Frequency range from 850 MHz to 920 MHz

! FSK through crystal pulling allows modulation

from DC to 40 kbit/s

! High FSK deviation possible for wideband data

transmission

! ASK achieved by on/off keying of internal

power amplifier

! FM possible with external varactor

! Wide power supply range from 2.2 V to 5.5 V

! High over-all frequency accuracy

! Very low standby current

! Adjustable output power range from

-15 dBm to +1 dBm

! Adjustable current consumption from

6.2 mA to 12.5 mA

! FSK deviation and center frequency independ-

ently adjustable

! Differential output well-suited for loop antenna

! External clock available for µC drive,

down to 1.9 V supply

! ”Clock only” mode

! Conforms to EN 300 220 and similar standards

Ordering Information

Part No.

TH7108

Temperature Code

E (-40 C° to 85 °C)

Package Code

FC (QSOP16)

Application Examples

! Keyless car and central locking

! Low-power telemetry

! Alarm and security systems

! General digital data transmission

! General analog audio signal transmission

Pin Description

LF1 1

SUB 2

DATA 3

RO2 4

RO1 5

ENTX 6

ENCK 7

CKOUT 8

TH7108

16 LF2

15 VCC

14 VEE

13 OUT1

12 OUT2

11 VEE

10 VCC

9 PS

General Description

The TH7108 FSK/ASK/FM transmitter IC is designed for applications in the European 868MHz industrial-

scientific-medical (ISM) band, according to the EN 300 220 telecommunications standard. It can also be

used for any other system with carrier frequencies ranging from 850 MHz to 920 MHz (e.g. for applications

in the US 915MHz ISM band).

The transmitter's carrier frequency fc is determined by the frequency of the reference crystal fref that is used.

The integrated PLL synthesizer ensures that each RF value, ranging from 850 MHz to 920 MHz, can be

achieved by using a crystal with reference frequency according to: fref = fc/N, where N = 32 is the PLL feed-

back divider ratio.

3901007108

Rev. 008

Page 1 of 14

Data Sheet

May/03

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