TH72036_12 Datasheet, PDF (1/15 Pages) Melexis Microelectronic Systems – 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
TH72036
868/915MHz
FSK/ASK Transmitter
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
-13 dBm to +9.5 dBm
Adjustable current consumption from
2.5 mA to 20.1 mA
Conforms to EN 300 220 and similar standards
10-pin quad flat no lead (QFN) package
Ordering Code
Product Code Temperature Code
TH72036
K
TH72036
K
Package Code
LD
LD
Option Code
CAA-000
CAA-000
Packing Form Code
TU
RE
Legend:
Temperature Code:
Package Code:
Packing Form:
K for Temperature Range -40°C to 125°C
LD for QFN double
RE for Reel, TU for Tube
Ordering example:
TH72036KLD-CAA-000-TU
Application Examples
Tire Pressure Monitoring System (TPMS)
Remote Keyless Entry (RKE)
Automatic Meter Reading (AMR)
Alarm and security systems
Garage door openers
Home and building automation
Low-power telemetry
Wireless access control
Pin Description
FSKDTA
FSKSW
ROI
ENTX
CKOUT
top view
VCC
VEE
OUT
CKDIV
PSEL
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. 009
Page 1 of 15
Data Sheet
Jun/12