TH72012 433MHz ASK Transmitter Features Application Examples Fully integrated PLL-stabilized VCO General digital data transmission Frequency range from 380 MHz to 450 MHz Tire Pressure Monitoring System (TPMS) Single-ended RF output Remote Keyless Entry (RKE) ASK achieved by on/off keying of internal Low-power telemetry power amplifier up to 40 kbit/s Alarm and security systems Wide power supply range from 1.95V to 5.5V Garage door openers Very low standby current Home automation On-chip low voltage detector High over-all frequency accuracy Pin Description Adjustable output power range from -12 dBm to +10 dBm Adjustable current consumption from 3.4 mA to 10.6 mA Conforms to EN 300 220 and similar standards 8-pin Small Outline Integrated Circuit (SOIC) Ordering information Product Code Temperature Code Package Code Option Code Packing Form Code TH72012 K DC BAA-000 RE TH72012 K DC BAA-000 TU Legend: Temperature Code: K for Temperature Range -40C to 125C Package Code: DC for SOIC Packing Form: RE for Reel, TU for Tube Ordering example: TH72012KDC-BAA-000-RE 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 any other country with similar frequency bands. The transmitter s carrier frequency f is determined by the frequency of the reference crystal f . The integrated PLL c ref synthesizer ensures that each RF value, ranging from 380 MHz to 450 MHz, can be achieved by using a crystal with a reference frequency according to: f = f /N, where N = 32 is the PLL feedback divider ratio. ref c Page 1 of 21 REVISION 013 - JUNE 14, 2017 3901072012 TH72012 433MHz ASK Transmitter Contents Features ..................................................................................................................................................... 1 Application Examples ................................................................................................................................. 1 Pin Description ........................................................................................................................................... 1 Ordering information ................................................................................................................................. 1 General Description ................................................................................................................................... 1 1. Theory of Operation ............................................................................................................................... 4 1.1. General................................................................................................................................................ 4 1.2. Block Diagram ..................................................................................................................................... 4 2. Functional Description ........................................................................................................................... 5 2.1. Crystal Oscillator ................................................................................................................................. 5 2.2. ASK Modulation .................................................................................................................................. 5 2.3. Crystal Pulling ..................................................................................................................................... 5 2.4. Output Power Selection ..................................................................................................................... 6 2.5. Lock Detection .................................................................................................................................... 6 2.6. Low Voltage Detection ....................................................................................................................... 6 2.7. Mode Control Logic ............................................................................................................................ 7 2.8. Timing Diagrams ................................................................................................................................. 7 3. Pin Definition and Description ................................................................................................................ 8 4. Electrical Characteristics ........................................................................................................................ 9 4.1. Absolute Maximum Ratings ............................................................................................................... 9 4.2. Normal Operating Conditions ............................................................................................................ 9 4.3. Crystal Parameters ............................................................................................................................. 9 4.4. DC Characteristics ............................................................................................................................ 10 4.5. AC Characteristics ............................................................................................................................. 11 4.6. Output Power Steps ......................................................................................................................... 11 5. Typical Operating Characteristics ......................................................................................................... 12 5.1. DC Characteristics ............................................................................................................................ 12 5.2. AC Characteristics ............................................................................................................................. 15 6. Test Circuit ........................................................................................................................................... 18 6.1. Test circuit component list to Fig. 17 .............................................................................................. 18 7. Package Information ............................................................................................................................ 19 Page 2 of 21 REVISION 013 - JUNE 14, 2017 3901072012