TH72036
868/915MHz
FSK/ASK Transmitter
Features
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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
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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)
Ordering Information
Part Number
TH72036
Application Examples
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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
Y
R
A
IN
IM
L
E
R
P
Temperature Code
Package Code
K (-40 °C to 125 °C)
LD (10L QFN 3x3 Dual)
Delivery Form
120 pc/tray
5000 pc/T&R
Pin Description
top
bottom
VCC
VEE
OUT
CKDIV
PSEL
10
9
8
7
6
1
2
3
4
5
FSKDTA
FSKSW
ROI
EN
CKOUT
TH72036
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
MELEXIS [ Melexis Microelectronic Systems ]
