TH72035 868/915MHz FSK/ASK Transmitter Features Fully integrated PLL-stabilized VCO On-chip low voltage detector Frequency range from 850 MHz to 930 MHz High over-all frequency accuracy Single-ended RF output FSK deviation and center frequency FSK through crystal pulling allows modulation independently adjustable from DC to 40 kbit/s Adjustable output power range from High FSK deviation possible for wideband data -11 dBm to +9.5 dBm transmission Adjustable current consumption from 5.1 mA to 13.4 mA ASK achieved by on/off keying of internal power amplifier up to 40 kbit/s Conforms to EN 300 220 and similar standards Wide power supply range from 1.95 V to 5.5 V 10-pin quad flat no lead (QFN) package Very low standby current Ordering Code Product Code Temperature Code Package Code Option Code Packing Form Code TH72035 K LD BAA-000 TU TH72035 K LD BAA-000 RE 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 Application Examples Pin Description top view Tire Pressure Monitoring System (TPMS) Remote Keyless Entry (RKE) ASKDTA VCC Automatic Meter Reading (AMR) FSKDTA VEE FSKSW OUT Alarm and security systems ROI VEE Garage door openers ENTX PSEL Home and building automation Low-power telemetry Wireless access control 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 inte- c ref grated PLL 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 ref c feedback divider ratio. 39010 72035 Page 1 of 20 Data Sheet Rev. 011 Jan/12 TH72035 868/915MHz FSK/ASK Transmitter Document Content 1 Theory of Operation ................................................................................................... 3 1.1 General .............................................................................................................................. 3 1.2 Block Diagram .................................................................................................................... 3 2 Functional Description .............................................................................................. 3 2.1 Crystal Oscillator ................................................................................................................ 3 2.2 FSK Modulation ................................................................................................................. 4 2.3 Crystal Pulling .................................................................................................................... 4 2.4 ASK Modulation ................................................................................................................. 5 2.5 Output Power Selection...................................................................................................... 5 2.6 Lock Detection ................................................................................................................... 5 2.7 Low Voltage Detection ....................................................................................................... 5 2.8 Mode Control Logic ............................................................................................................ 6 2.9 Timing Diagrams ................................................................................................................ 6 3 Pin Definition and Description .................................................................................. 7 4 Electrical Characteristics .......................................................................................... 8 4.1 Absolute Maximum Ratings ................................................................................................ 8 4.2 Normal Operating Conditions ............................................................................................. 8 4.3 Crystal Parameters ............................................................................................................ 8 4.4 DC Characteristics ............................................................................................................. 9 4.5 AC Characteristics ........................................................................................................... 10 4.6 Output Power Steps ......................................................................................................... 10 5 Typical Operating Characteristics .......................................................................... 11 5.1 DC Characteristics ........................................................................................................... 11 5.2 AC Characteristics ........................................................................................................... 14 6 Test Circuit ............................................................................................................... 17 6.1 Test circuit component list to Fig. 18 ................................................................................ 17 7 Package Description ................................................................................................ 18 7.1 Soldering Information ....................................................................................................... 18 7.2 Recommended PCB Footprints ........................................................................................ 18 8 Standard information regarding manufacturability of Melexis products with different soldering processes ................................................................................. 19 9 ESD Precautions ...................................................................................................... 19 10 Disclaimer ................................................................................................................. 20 39010 72035 Page 2 of 20 Data Sheet Rev. 011 Jan/12