© Semtech 2006 www.semtech.com
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XE1202A TrueRF™
TABLE OF CONTENTS
1 Functional Block Diagram....................................................................................................................... 4
2 Pin description......................................................................................................................................... 5
3 Electrical Characteristics........................................................................................................................ 6
3.1 Absolute Maximum Operating Ranges.................................................................................................. 6
3.2 Specifications........................................................................................................................................ 6
3.2.1 Operating Range ....................................................................................................................................... 6
3.2.2 Electrical Specifications ............................................................................................................................. 6
4 Description............................................................................................................................................... 9
4.1 Detailed description .................................................................................................................................. 9
4.1.1 Receiver .................................................................................................................................................... 9
4.1.2 Receiver LNA modes .............................................................................................................................. 10
4.1.3 RSSI ........................................................................................................................................................ 11
4.1.4 Frequency Error Indicator - FEI................................................................................................................ 11
4.1.5 Transmitter............................................................................................................................................... 14
4.1.6 Pattern recognition................................................................................................................................... 15
4.1.7 Frequency synthesizer............................................................................................................................. 15
5 Serial Interface Definition, Principles of Operation............................................................................. 16
5.1 Serial Control Interface ............................................................................................................................ 16
5.1.1 General description.................................................................................................................................. 16
5.1.2 Write sequence........................................................................................................................................ 16
5.1.3 Read sequence........................................................................................................................................ 16
5.2 Configuration and Status registers........................................................................................................... 17
5.2.1 RTParam configuration register ............................................................................................................... 17
5.2.2 FSParam configuration register ............................................................................................................... 19
5.2.3 DataOut register ...................................................................................................................................... 20
5.2.4 ADParam configuration register............................................................................................................... 20
5.2.5 Pattern register ........................................................................................................................................ 21
5.3 Operating Modes ................................................................................................................................ 23
5.4 Transmitted Data Interface ................................................................................................................. 25
5.5 Received Data Interface ..................................................................................................................... 25
5.6 Pattern Recognition Interface.............................................................................................................. 26
5.7 Clock Output Interface........................................................................................................................ 26
5.8 Default settings at power-up ............................................................................................................... 26
6 Application Information......................................................................................................................... 27
6.1 Receiver matching network................................................................................................................. 27
6.2 Transmitter matching network ............................................................................................................ 27
6.3 VCO tank............................................................................................................................................ 29
6.4 Loop filter of the frequency synthesizer............................................................................................... 30
6.5 Reference crystal for the frequency synthesizer .................................................................................30
7 Packaging information .......................................................................................................................... 32
