th71221 Melexis Company, th71221 Datasheet - Page 2

• Manufacturer Part Number: th71221
• Description: Transceiver - 27 To 930mhz, Fsk/fm/ask, Multi-channel 32l Qfn 5x5 Quad
• Manufacturer: Melexis Company

Document Content
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39010 071221
Rev. 006
1.1
1.2
1.3
1.4
1.5
3.1
3.2
3.3
4.1
4.2
5.1
Theory of Operation ...................................................................................................4
Pin Definitions and Descriptions ..............................................................................6
Functional Description ............................................................................................10
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.1.8
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
Description of User Modes......................................................................................18
4.1.1
4.1.2
4.1.3
4.1.4
4.2.1
Register Description ................................................................................................20
General ............................................................................................................................. 4
Technical Data Overview.................................................................................................. 4
Note on ASK Operation .................................................................................................... 4
Block Diagram .................................................................................................................. 5
User Mode Features ......................................................................................................... 5
PLL Frequency Synthesizer ........................................................................................... 10
Receiver Part .................................................................................................................. 13
Transmitter Part .............................................................................................................. 15
Stand-alone User Mode Operation ................................................................................. 18
Programmable User Mode Operation............................................................................. 19
Register Overview .......................................................................................................... 21
Reference Oscillator (XOSC)..................................................................................................... 11
Reference Divider ...................................................................................................................... 11
Feedback Divider ....................................................................................................................... 11
Frequency Resolution and Operating Frequency ...................................................................... 11
Phase-Frequency Detector ........................................................................................................ 12
Lock Detector............................................................................................................................. 12
Voltage Controlled Oscillator with external Loop Filter.............................................................. 13
Loop Filter .................................................................................................................................. 13
LNA ............................................................................................................................................ 14
Mixer .......................................................................................................................................... 14
IF Amplifier ................................................................................................................................. 14
ASK Demodulator ...................................................................................................................... 14
FSK Demodulator ...................................................................................................................... 15
Power Amplifier.......................................................................................................................... 15
Output Power Adjustment .......................................................................................................... 16
Modulation Schemes ................................................................................................................. 16
ASK Modulation ......................................................................................................................... 16
FSK Modulation ......................................................................................................................... 17
Crystal Tuning............................................................................................................................ 17
Frequency Selection .................................................................................................................. 18
Operation Mode ......................................................................................................................... 18
Modulation Type ........................................................................................................................ 19
LNA Gain Mode ......................................................................................................................... 19
Serial Control Interface Description ........................................................................................... 19
Page 2 of 44
FSK/FM/ASK Transceiver
TH71221
27 to 930MHz
Data Sheet
June/08