TH72002 Datasheet, PDF(1/20 Page) Melexis Microelectronic Systems

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TH72002 Datasheet, PDF (1/20 Pages) Melexis Microelectronic Systems – ASK Transmitter

TH72002

315MHz

ASK Transmitter

Features

! Fully integrated PLL-stabilized VCO

! Frequency range from 290 MHz to 350 MHz

! Single-ended RF output

! ASK achieved by on/off keying of internal

power amplifier up to 40 kbit/s

! 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

! Adjustable output power range from

-12 dBm to +11 dBm

! Adjustable current consumption from

3.2 mA to 10.3 mA

! Conforms to FCC part 15 and similar standards

! 8-pin Small Outline Integrated Circuit (SOIC)

Ordering Information

Part Number

Temperature Code

TH72002

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

ASKDTA 1

n. c. 2

ROI 3

ENTX 4

TH72002

8 VEE

7 OUT

6 VCC

5 PSEL

General Description

The TH72002 ASK transmitter IC is designed for applications in the 315 MHz industrial-scientific-medical

(ISM) band. It can also be used for any other system with carrier frequencies ranging from

290 MHz to 350 MHz.

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

grated PLL synthesizer ensures that carrier frequencies, ranging from 290 MHz to 350 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.

3901072002

Rev. 007

Page 1 of 20

Data Sheet

June/07

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