TH72012
433MHz
ASK Transmitter
Features
!
!
!
!
Fully integrated PLL-stabilized VCO
Frequency range from 380 MHz to 450 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 +11 dBm
!
Adjustable current consumption from
3.2 mA to 10.3 mA
!
Conforms to EN 300 220 and similar standards
!
8-pin Small Outline Integrated Circuit (SOIC)
Ordering Information
Part Number
TH72012
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
ASKDTA
1
n. c.
2
ROI
3
ENTX
4
TH72012
8
VEE
7
OUT
6
VCC
5
PSEL
General Description
The TH72012 ASK 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 72012
Rev. 009
Page 1 of 20
Data Sheet
July/06
MELEXIS [ Melexis Microelectronic Systems ]
