TH72005_12 Datasheet, PDF (2/20 Pages) Melexis Microelectronic Systems – FSK/ASK Transmitter

TH72005
315MHz
FSK/ASK Transmitter
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 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 ............................................................................. 17
7 Package Description ................................................................................................18
7.1 Soldering Information.................................................................................................... 18
7.2 Recommended PCB Footprints..................................................................................... 18
8 Reliability Information..............................................................................................19
9 ESD Precautions ......................................................................................................19
10 Disclaimer .................................................................................................................20
3901072005
Rev. 011
Page 2 of 20
Data Sheet
Jul/12