TH72035 868/915MHz FSK/ASK Transmitter Features Application Examples Fully integrated PLL-stabilized VCO Tire Pressure Monitoring System (TPMS) Frequency range from 850 MHz to 930 MHz Remote Keyless Entry (RKE) Single-ended RF output Automatic Meter Reading (AMR) FSK through crystal pulling allows Alarm and security systems modulation from DC to 40 kbit/s Garage door openers High FSK deviation possible for wideband Home and building automation data transmission Low-power telemetry ASK achieved by on/off keying of internal Wireless access control power amplifier up to 40 kbit/s Wide power supply range from 1.95 V to 5.5 Pin Description V top view Very low standby current On-chip low voltage detector ASKDTA VCC FSKDTA VEE High over-all frequency accuracy FSKSW OUT FSK deviation and center frequency ROI VEE independently adjustable ENTX PSEL Adjustable output power range from -11 dBm to +9.5 dBm Adjustable current consumption from 5.1 mA to 13.4 mA Conforms to EN 300 220 and similar standards 10-pin quad flat no lead (QFN) package Ordering information Product Code Temperature Code Package Code Option Code Packing Form Code TH72035 K LD BAA-000 RE TH72035 K LD BAA-000 TU Legend: Temperature Code: K for Temperature Range -40C to 125C Package Code: LD for QFN double Packing Form: RE for Reel, TU for Tube Ordering example: TH72035KLD-BAA-000-TU General Description The TH72035 FSK/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 f is determined by the frequency of the reference crystal f . The integrated PLL c ref synthesizer ensures that each RF value, ranging from 850 MHz to 930 MHz, can be achieved. This is done 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 012 - JUNE 14, 2017 3901072035 TH72035 868/915MHz FSK/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 ........................................................................................................................... 4 2.1. Crystal Oscillator ................................................................................................................................. 4 2.2. FSK Modulation .................................................................................................................................. 5 2.3. Crystal Pulling ..................................................................................................................................... 5 2.4. ASK Modulation .................................................................................................................................. 6 2.5. Output Power Selection ..................................................................................................................... 6 2.6. Lock Detection .................................................................................................................................... 6 2.7. Low Voltage Detection ....................................................................................................................... 7 2.8. Mode Control Logic ............................................................................................................................ 7 2.9. 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. 18 .............................................................................................. 18 Page 2 of 21 REVISION 012 - JUNE 14, 2017 3901072035