TH72032 Datasheet, PDF (1/20 Pages) Melexis Microelectronic Systems – 868/915MHz ASK Transmitter

TH72032
868/915MHz
ASK Transmitter
Features
! Fully integrated PLL-stabilized VCO
! Frequency range from 850 MHz to 930 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 +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
TH72032
K (-40°C to 125°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
TH72032
8 VEE
7 OUT
6 VCC
5 PSEL
General Description
The TH72032 ASK 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 f_c is determined by the frequency of the reference crystal f_ref. 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: f_ref = f_c/N, where N = 32 is the PLL
feedback divider ratio.
3901072032
Rev. 008
Page 1 of 20
Data Sheet
June/07