TH72011
433MHz
FSK Transmitter
Features
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Fully integrated PLL-stabilized VCO
Frequency range from 380 MHz to 450 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
Wide power supply range from 1.95 V to 5.5 V
Very low standby current
On-chip low voltage detector
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High over-all frequency accuracy
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FSK deviation and center frequency independ-
ently adjustable
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Adjustable output power range from
-12 dBm to +10 dBm
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Adjustable current consumption from
3.4 mA to 10.6 mA
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Conforms to EN 300 220 and similar standards
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8-pin Small Outline Integrated Circuit (SOIC)
Ordering Information
Part Number
TH72011
Temperature Code
K (-40°C to 125°C)
Package Code
DC (SOIC8)
Delivery Form
98 pc/tube
2500 pc/T&R
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
Pin Description
FSKDTA
1
FSKSW
2
ROI
3
ENTX
4
TH72011
8
VEE
7
OUT
6
VCC
5
PSEL
General Description
The TH72011 FSK transmitter IC is designed for applications in the European 433 MHz industrial-scientific-
medical (ISM) band, according to the EN 300 220 telecommunications standard; but it can also be used in
other countries with similar standards, e.g. FCC part 15.231.
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 380 MHz to 450 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.
39010 72011
Rev. 008
Page 1 of 20
Data Sheet
June /07
MELEXIS [ Melexis Microelectronic Systems ]
