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TH72032
Transmitter - 868/915MHz, ASK
 Download TH72032 Datasheet (PDF)
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TH72032 General Description
The TH72032 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 fc is determined by the frequency of the reference crystal fref. The integrated 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: fref = fc/N, where N = 32 is the PLL feedback divider ratio.
TH72032 Features and Benefits
- Fully integrated PLL-stabilized VCO
- Frequency range from 850 MHz to 930 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
- Operating temperature range -40°C to +125°C
- Very low standby current
- On-chip low voltage detector
- High over-all frequency accuracy
- Adjustable output power range from -11 dBm to +9 dBm
- Adjustable current consumption from 5.1 mA to 13.4 mA
- Conforms to EN 300 220 and similar standards
- 8-pin Small Outline Integrated Circuit (SOIC)
TH72032 Applications
| Application Note |
File Type |
Size |
Revision |
Date |
Action |
| PA Output Matching |
PDF |
114.5 KB |
001 |
4/10/2006 |
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TH72032 Environmental Information
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TH72032 Frequently asked Questions
EVB72032 Antenna Gain
Question
Well, the 3dB bandwidth of this loop antenna loaded with the TH72032 output should be in the range of 30MHz, maybe a little less. This is just an estimation. But you could measure the bandwidth by sweeping the PLL reference signal. Usually a reference crystal is used (e.g. 27.1344MHz to yield an RF of 868.3MHz). But you can AC-connect the RO input to a generator to sweep the reference and so you can sweep the RF.
TH71081 replacement
Answer
We can suggest following replacements:
TH72031 Transmitter - 868/915MHz, FSK (SOIC8)
TH72032 Transmitter - 868/915MHz, ASK (SOIC8)
TH72035 Transmitter - 868/915MHz, FSK/ASK (10L QFN 3x3 Dual)
For an overview of the main parameters you can download our quick section guide:
http://www.melexis.com/Asset.aspx?nID=3752
For pricing, sampling and purchasing I would like to point you to our local partner in Slovenia:
IC Elektronika d.o.o.
Vodovodna cesta 100
Ljubljana.
1000 Slovenia
Phone +386 1 5680111
Fax +386 1 5689107
E-mail prodaja@ic-elect.si
Web www.ic-elect.si
TH72032 Noise Problem
Question
We are using the TH72032 and even unmodulated we are getting very strong phase noise, actually at 2Mhz from carrier still we get -36 dBcarrier noise when carrier power is 6dBm. According to the spec this should be much lower. We are using a good layout practice with ground plane one side and also under the IC body. Can anyone help please?
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