The Melexis TH72015 FSK/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. It can also be used in other countries with similar standards like FCC part 15.231.
The transmitter's carrier frequency is determined by the frequency of the reference crystal fref. The integrated phase-locked loop (PLL) synthesizer ensures that carrier frequencies, ranging from 380 to 450 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.
| Features |
Application examples |
- Fully integrated PLL-stabilized VCO
- Frequency range from 380MHz to 450MHz
- Single-ended RF output
- FSK through crystal pulling allows modulation from DC to 40kbit/s
- High FSK deviation possible for wideband data transmission
- ASK achieved by on/off keying of internal power amplifier up to 40kbit/s
- Wide power supply range from 1.95V to 5.5V
- Operating temp. range of -40°C to +125°C
- Very low standby current
- On-chip low voltage detector
- High over-all frequency accuracy
- FSK deviation and center frequency independently adjustable
- Adjustable output power range from -10dBm to max. +10Bm
- Adjustable current consumption from 3.4mA to 10.6mA
- Conforms to EN 300 220 and similar standards
- 10-pin Quad Flat No-Lead 10L QFN 3x3 (Dual)
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- Automatic meter reading (AMR)
- Tire pressure monitoring systems (TPMS)
- Home and building automation
- Low power telemetry systems
- Alarm and Security Systems
- Consumer remote controls
- Garage door openers
- Wireless access control
- Remote controls
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