SX1211 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
Manufacturer
SX1211 Datasheet PDF : 92 Pages
| |||
ADVANCED COMMUNICATIONS & SENSING
7.6.9. Pout Stability over Temperature and Voltage .................... 84
7.6.10. Transmitter Spectral Purity ............................................. 85
7.6.11. OOK Channel Bandwidth................................................ 86
7.6.12. FSK Spectrum in Europe ................................................ 87
7.6.13. Digital Modulation Schemes............................................ 88
7.6.14. Current Stability over Temperature and Voltage ............. 89
Index of Figures
Figure 1: SX1211 Simplified Block Diagram ................................. 5
Figure 2: SX1211 Pin Diagram ..................................................... 6
Figure 3: SX1211 Detailed Block Diagram.................................. 12
Figure 4: Power Supply Breakdown............................................ 13
Figure 5: Frequency Synthesizer Description.............................. 14
Figure 6: LO Generator .............................................................. 14
Figure 7: Loop Filter ................................................................... 16
Figure 8: Transmitter Architecture .............................................. 18
Figure 9: I(t), Q(t) Overview ........................................................ 18
Figure 10: PA Control ................................................................. 21
Figure 11: Optimal Load Impedance Chart ................................. 21
Figure 12: Recommended PA Biasing and Output Matching ..... 22
Figure 13: Front-end Description ................................................ 22
Figure 14: Receiver Architecture ................................................ 23
Figure 15: FSK Receiver Setting ................................................ 23
Figure 16: OOK Receiver Setting ............................................... 23
Figure 17: Active Channel Filter Description ............................... 24
Figure 18: Butterworth Filter's Actual BW ................................... 26
Figure 19: Polyphase Filter's Actual BW ..................................... 26
Figure 20: RSSI Dynamic Range................................................ 27
Figure 21: RSSI IRQ Timings ..................................................... 28
Figure 22: OOK Demodulator Description................................... 29
Figure 23: Floor Threshold Optimization ..................................... 30
Figure 24: BitSync Description.................................................... 31
Figure 25: SX1211’s Data Processing Conceptual View............. 34
Figure 26: SPI Interface Overview and uC Connections ............. 35
Figure 27: Write Register Sequence ........................................... 36
Figure 28: Read Register Sequence........................................... 37
Figure 29: Write Bytes Sequence (ex: 2 bytes) ........................... 37
Figure 30: Read Bytes Sequence (ex: 2 bytes)........................... 38
Figure 31: FIFO and Shift Register (SR) ..................................... 38
Figure 32: FIFO Threshold IRQ Source Behavior ....................... 39
Figure 33: Sync Word Recognition ............................................. 40
Figure 34: Continuous Mode Conceptual View ........................... 41
Figure 35: Tx Processing in Continuous Mode............................ 41
Figure 36: Rx Processing in Continuous Mode ........................... 42
Figure 37: uC Connections in Continuous Mode......................... 43
Figure 38: Buffered Mode Conceptual View................................ 44
Figure 39: Tx processing in Buffered Mode ................................ 45
Figure 40: Rx Processing in Buffered Mode................................ 46
Figure 41: uC Connections in Buffered Mode ............................. 47
Figure 42: Packet Mode Conceptual View .................................. 49
Figure 43: Fixed Length Packet Format...................................... 50
Figure 44: Variable Length Packet Format.................................. 51
Figure 45: CRC Implementation ................................................. 53
SX1211
8. Packaging Information ............................................................ 90
8.1. Package Outline Drawing..................................................... 90
8.2. PCB Land Pattern................................................................ 90
8.3. Tape & Reel Specification.................................................... 91
9. Revision History...................................................................... 92
10. Contact Information .............................................................. 92
Figure 46: Manchester Encoding/Decoding ................................ 54
Figure 47: Data Whitening .......................................................... 54
Figure 48: uC Connections in Packet Mode ................................ 55
Figure 49: Optimized Rx Cycle ................................................... 67
Figure 50: Optimized Tx Cycle.................................................... 68
Figure 51: Tx Hop Cycle ............................................................. 69
Figure 52: Rx Hop Cycle............................................................. 70
Figure 53: Rx Tx Rx Cycle ................................................. 71
Figure 54: POR Timing Diagram................................................. 72
Figure 55: Manual Reset Timing Diagram................................... 72
Figure 56: Reference Design Circuit Schematic.......................... 73
Figure 57: Reference Design‘s Stackup...................................... 74
Figure 58: Reference Design Layout (top view) .......................... 74
Figure 59: 915 MHz SAW Filter Plot ........................................... 75
Figure 60: 869 MHz SAW Filter Plot ........................................... 75
Figure 61: Sensitivity Across the 868 MHz Band......................... 77
Figure 62: Sensitivity Across the 915 MHz Band......................... 77
Figure 63: FSK Sensitivity Loss vs. LO Drift................................ 78
Figure 64: OOK Sensitivity Loss vs. LO Drift............................... 78
Figure 65: FSK Sensitivity vs. Rx BW ......................................... 79
Figure 66: OOK Sensitivity Change vs. Rx BW ........................... 79
Figure 67: Sensitivity Stability ..................................................... 80
Figure 68: FSK Sensitivity vs. BR ............................................... 80
Figure 69: OOK Sensitivity vs. BR .............................................. 81
Figure 70: ACR in FSK Mode...................................................... 81
Figure 71: ACR in OOK Mode..................................................... 82
Figure 72: Pout for 869 MHz Band Operation ............................. 82
Figure 73: Pout for 915 MHz Band Operation ............................. 83
Figure 74: Pout and IDD at all PA Settings, 869 MHz ................. 83
Figure 75: Pout and IDD at all PA Settings, 915 MHz ................. 84
Figure 76: Pout Stability.............................................................. 84
Figure 77: 869 MHz Spectral Purity DC-1GHz ............................ 85
Figure 78: 869 MHz Spectral Purity 1-6GHz ............................... 85
Figure 79: OOK Spectrum - 2kbps.............................................. 86
Figure 80: OOK Spectrum - 8kbps.............................................. 86
Figure 81: OOK Spectrum - 16.7kbps ......................................... 86
Figure 82: FSK - 1.56kbps - +/-33 kHz........................................ 87
Figure 83: FSK - 25 kbps - +/-50 kHz.......................................... 87
Figure 84: FSK - 40 kbps - +/-40 kHz.......................................... 87
Figure 85: DTS 6dB Bandwidth................................................... 88
Figure 86: DTS Power Spectral Density...................................... 88
Figure 87: IDD vs. Temp and VDD.............................................. 89
Figure 88: Package Outline Drawing........................................... 90
Figure 89: PCB Land Pattern...................................................... 90
Figure 90: Tape & Reel Dimensions ........................................... 91
Rev 7 – Sept 2nd, 2008
Page 3 of 92
www.semtech.com
Share Link: 