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EVB72035 Datasheet(PDF) 2 Page - Melexis Microelectronic Systems |
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EVB72035 Datasheet(HTML) 2 Page - Melexis Microelectronic Systems |
2 / 14 page EVB72035 868/915MHz FSK/ASK Transmitter Evaluation Board Description 39012 72035 01 Page 2 of 14 EVB Description Rev. 007 June/07 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 Antenna Board Circuit Diagram ................................................................................7 3.1 Board Component Values to Fig. 6 .................................................................................. 7 3.2 Antenna Board PCB Top View ......................................................................................... 8 3.3 Board Connection ............................................................................................................. 8 4 50 Ω Connector Board Circuit Diagram.....................................................................9 4.1 Board Component Values to Fig. 7 .................................................................................. 9 4.2 50 Ω Connector Board PCB Top View ............................................................................ 10 4.3 Board Connection ........................................................................................................... 10 5 Evaluation Board Layouts .......................................................................................11 5.1 Antenna Board................................................................................................................ 11 5.2 PCB Loop Antenna Dimensions ..................................................................................... 11 5.3 Connector Board ............................................................................................................ 12 6 Board Variants..........................................................................................................12 7 Package Description ................................................................................................13 7.1 Soldering Information ..................................................................................................... 13 7.2 Recommended PCB Footprints ...................................................................................... 13 8 Disclaimer .................................................................................................................14 |
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