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TH72001 Datasheet(PDF) 3 Page - Melexis Microelectronic Systems |
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TH72001 Datasheet(HTML) 3 Page - Melexis Microelectronic Systems |
3 / 20 page TH72001 315MHz FSK Transmitter 3901072001 Page 3 of 20 Data Sheet Rev. 010 Jun/12 1 Theory of Operation 1.1 General As depicted in Fig.1, the TH72001 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 internal 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) synthesizer. The VCO’s output signal feeds the power amplifier (PA). The RF signal power Pout can be adjusted in four steps from Pout = –12 dBm to +11 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 2.1 V to 5.5 V. 1.2 Block Diagram Fig. 1: Block diagram with external components CX1 FSKDTA antenna matching network VEE XOSC low voltage detector PA XBUF VCO PLL CP PFD 32 OUT PSEL RPS FSKSW ROI XTAL CX2 8 1 7 5 3 2 mode control ENTX 4 6 VCC |
Similar Part No. - TH72001_12 |
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Similar Description - TH72001_12 |
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