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EVB72036-433-FSK-C Datasheet(PDF) 3 Page - Melexis Microelectronic Systems |
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EVB72036-433-FSK-C Datasheet(HTML) 3 Page - Melexis Microelectronic Systems |
3 / 12 page PR EL IM INA RY EVB72036 868/915MHz FSK/ASK Transmitter Evaluation Board Description 3901272036 01 Page 3 of 12 EVB Description Rev. 002 June/07 1 Theory of Operation 1.1 General As depicted in Fig.1, the TH72036 transmitter consists of a fully integrated voltage-controlled oscillator (VCO), a divide-by-32 divider (div32), a phase-frequency detector (PFD) and a charge pump (CP). An inter- nal loop filter determines the dynamic behavior of the PLL and suppresses reference spurious signals. A Colpitts crystal oscillator (XOSC) is used as the reference oscillator of a phase-locked loop (PLL) synthe- sizer. The VCO’s output signal feeds the power amplifier (PA). The RF signal power Pout can be adjusted in four steps from Pout = –11 dBm to +9.5 dBm, either by changing the value of resistor RPS or by varying the voltage VPS at pin PSEL. The open-collector output (OUT) can be used either to directly drive a loop antenna or to be matched to a 50Ohm load. Bandgap biasing ensures stable operation of the IC at a power supply range of 1.95 V to 5.5 V. 1.2 Block Diagram Fig. 1: Block diagram with external components 2 Functional Description 2.1 Crystal Oscillator A Colpitts crystal oscillator with integrated functional capacitors is used as the reference oscillator for the PLL synthesizer. The equivalent input capacitance CRO offered by the crystal oscillator input pin ROI is about 18pF. The crystal oscillator is provided with an amplitude control loop in order to have a very stable fre- quency over the specified supply voltage and temperature range in combination with a short start-up time. CX1 FSKDTA antenna matching network XOSC PA XBUF VCO PLL CP PFD 32 OUT PSEL FSKSW ROI XTAL CX2 VEE 9 1 8 6 3 2 10 VCC div 8 div 32 CKDIV 5 7 mode control ENTX 4 CKOUT ASKDTA RPS R1 |
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