TH72036 Datasheet, PDF (1/16 Pages) Melexis Microelectronic Systems – 868/915MHz FSK/ASK Transmitter

TH72036
868/915MHz
FSK/ASK 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
! 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
! Microcontroller clock output
! On-chip low voltage detector
! High over-all frequency accuracy
! FSK deviation and center frequency
independently adjustable
! Adjustable output power range from
-11 dBm to +9.5 dBm
! Adjustable current consumption from
5.5 mA to 13.8 mA
! Conforms to EN 300 220 and similar standards
! 10-pin Quad Flat No-Lead Package (QFN)
PRELIMINARY ^{Ordering Information}
Part Number
Temperature Code
TH72036
K (-40 °C to 125 °C)
Package Code
LD (10L QFN 3x3 Dual)
Delivery Form
120 pc/tray
5000 pc/T&R
Application Examples
! General digital data transmission
Pin Description
! Tire Pressure Monitoring Systems (TPMS)
! Remote Keyless Entry (RKE)
top
bottom
! Wireless access control
! Alarm and security systems
! Garage door openers
! Remote Controls
! Home and building automation
FSKDTA
VCC 10
1
FSKSW
VEE
9
2
ROI TH72036 OUT 8
3
EN
CKDIV 7
4
CKOUT
PSEL 6
5
! Low-power telemetry systems
General Description
The TH72036 FSK/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 carrier frequencies, 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.
A clock signal with selectable frequency is provided. It can be used to drive a microcontroller.
3901072036
Rev. 005
Page 1 of 16
Data Sheet
June/07