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TH72012 Dataheets PDF



Part Number TH72012
Manufacturers Melexis
Logo Melexis
Description ASK Transmitter
Datasheet TH72012 DatasheetTH72012 Datasheet (PDF)

TH72012 433MHz ASK Transmitter Features ! Fully integrated PLL-stabilized VCO ! Frequency range from 380 MHz to 450 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 ! Very low standby current ! On-chip low voltage detector ! High over-all frequency accuracy ! Adjustable output power range from -12 dBm to +11 dBm ! Adjustable current consumption from 3.2 mA to 10.3 mA ! Conforms to EN 300 220 .

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TH72012 433MHz ASK Transmitter Features ! Fully integrated PLL-stabilized VCO ! Frequency range from 380 MHz to 450 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 ! Very low standby current ! On-chip low voltage detector ! High over-all frequency accuracy ! Adjustable output power range from -12 dBm to +11 dBm ! Adjustable current consumption from 3.2 mA to 10.3 mA ! Conforms to EN 300 220 and similar standards ! 8-pin Small Outline Integrated Circuit (SOIC) Ordering Information Part Number Temperature Code TH72012 K (-40°C to 125°C) Package Code DC (SOIC8) Delivery Form 98 pc/tube 2500 pc/T&R Application Examples ! General digital data transmission ! Tire Pressure Monitoring Systems (TPMS) ! Remote Keyless Entry (RKE) ! Wireless access control ! Alarm and security systems ! Garage door openers ! Remote Controls ! Home and building automation ! Low-power telemetry systems Pin Description ASKDTA 1 n. c. 2 ROI 3 ENTX 4 TH72012 8 VEE 7 OUT 6 VCC 5 PSEL General Description The TH72012 ASK transmitter IC is designed for applications in the European 433 MHz industrial-scientificmedical (ISM) band, according to the EN 300 220 telecommunications standard; but it can also be used in other countries with similar standards, e.g. FCC part 15.231. 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 380 MHz 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. 39010 72012 Rev. 009 Page 1 of 20 Data Sheet July/06 TH72012 433MHz ASK Transmitter Document Content 1 Theory of Operation ...................................................................................................3 1.1 General............................................................................................................................. 3 1.2 Block Diagram .................................................................................................................. 3 2 Functional Description ..............................................................................................4 2.1 Crystal Oscillator .............................................................................................................. 4 2.2 ASK Modulation................................................................................................................ 4 2.3 Crystal Pulling................................................................................................................... 4 2.4 Output Power Selection.................................................................................................... 5 2.5 Lock Detection.................................................................................................................. 5 2.6 Low Voltage Detection...................................................................................................... 5 2.7 Mode Control Logic .......................................................................................................... 6 2.8 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 ...................


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