EVB72035 Datasheet, PDF (2/14 Pages) Melexis Microelectronic Systems – 868/915MHz FSK/ASK Transmitter Evaluation Board Description

EVB72035
868/915MHz FSK/ASK Transmitter
Evaluation Board Description
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 50Ω Connector Board Circuit Diagram.....................................................................9
4.1 Board Component Values to Fig. 7 .................................................................................. 9
4.2 50Ω 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
39012 72035 01
Rev. 007
Page 2 of 14
EVB Description
June/07