TH72031 Datasheet, PDF(1/20 Page) Melexis Microelectronic Systems

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TH72031 Datasheet, PDF (1/20 Pages) Melexis Microelectronic Systems – 868/915MHz FSK Transmitter

TH72031

868/915MHz

FSK Transmitter

Features

! Fully integrated PLL-stabilized VCO

! Frequency range from 850 MHz to 930 MHz

! Single-ended RF output

! FSK through crystal pulling allows modulation

from DC to 40 kbit/s

! High FSK deviation possible for wideband data

transmission

! Wide power supply range from 1.95 V to 5.5 V

! Very low standby current

! On-chip low voltage detector

! High over-all frequency accuracy

! FSK deviation and center frequency independ-

ently adjustable

! Adjustable output power range from

-12 dBm to +9.5 dBm

! Adjustable current consumption from

5.1 mA to 13.4 mA

! Conforms to EN 300 220 and similar standards

! 8-pin Small Outline Integrated Circuit (SOIC)

Ordering Information

Part Number

Temperature Code

TH72031

K (-40Â°C to 125Â°C)

Package Code

DC (SOIC8)

Delivery Form

98 pc/tube

2500 pc/T&R

Application Examples

! General digital data transmission

! Tire Pressure Monitoring Systems (TPMS)

! Remote Keyless Entry (RKE)

! Wireless access control

! Alarm and security systems

! Garage door openers

! Remote Controls

! Home and building automation

! Low-power telemetry systems

Pin Description

FSKDTA 1

FSKSW 2

ROI 3

ENTX 4

TH72031

8 VEE

7 OUT

6 VCC

5 PSEL

General Description

The TH72031 FSK transmitter IC is designed for applications in the European 868 MHz 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 930 MHz (e.g. for applications in the US 902

to 928 MHz ISM band).

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

grated PLL synthesizer ensures that each RF value, ranging from 850 MHz to 930 MHz, can be achieved.

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

feedback divider ratio.

3901072031

Rev. 008

Page 1 of 20

Data Sheet

June/07

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