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SX1223
Table of Contents
1
2
3
3.1
3.2
3.2.1
3.2.2
4
4.1
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.2
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.3
4.4
5
5.1
5.2
5.2.1
5.2.2
5.2.3
6
6.1
6.2
6.3
6.4
6.5
7
Functional Block Diagram .................................................................................................................. 3
Pin description..................................................................................................................................... 4
Electrical Characteristics.................................................................................................................... 5
Absolute Maximum Operating Ranges.................................................................................................. 5
Specifications ........................................................................................................................................ 5
Operating Range ................................................................................................................................... 5
Electrical Specifications......................................................................................................................... 5
General description............................................................................................................................. 7
Frequency synthesizer........................................................................................................................... 7
General Structure .................................................................................................................................. 7
Crystal Oscillator ................................................................................................................................... 8
VCO....................................................................................................................................................... 8
Charge Pump ...................................................................................................................................... 10
Loop Filter............................................................................................................................................ 10
Lock Detect.......................................................................................................................................... 11
Modulator............................................................................................................................................. 11
Introduction.......................................................................................................................................... 11
Data Interface ...................................................................................................................................... 11
Bit Rate Setting for MW1 and MW2 .................................................................................................... 12
Deviation Setting for MW1 and MW2 .................................................................................................. 12
Shaping for MW1 and MW2 ................................................................................................................ 13
Modulator Saturation for MW1 and MW2............................................................................................ 13
Summary of Modulator Settings for MW1 and MW2........................................................................... 13
Frequency deviation setting for MW3.................................................................................................. 13
Power Amplifier ................................................................................................................................... 14
Voltage regulators ............................................................................................................................... 14
Serial Interface definition and Principles of operation .................................................................. 15
Serial Control Interface........................................................................................................................ 15
Configuration and Status registers ...................................................................................................... 16
Operating Modes ................................................................................................................................. 16
Other Settings...................................................................................................................................... 17
Optional and Test Parameters ............................................................................................................ 19
Application Information .................................................................................................................... 21
Matching network of the transmitter .................................................................................................... 21
Reference crystal for the frequency synthesizer ................................................................................. 22
Loop filter components ........................................................................................................................ 22
Recommended modulation conditions ................................................................................................ 22
TYPICAL APPLICATION SCHEMATICS ............................................................................................ 23
Packaging information...................................................................................................................... 24
? Semtech 2007
2
www.semtech.com
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