SX1239 View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

SX1239

Low Power Integrated UHF Receiver

Semtech Corporation 

SX1239

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Table of Contents

Page

1. General Description ................................................................................................................................................ 8

1.1. Simplified Block Diagram ................................................................................................................................ 8

1.2. Pin and Marking Diagram................................................................................................................................ 9

1.3. Pin Description .............................................................................................................................................. 10

2. Electrical Characteristics....................................................................................................................................... 11

2.1. ESD Notice.................................................................................................................................................... 11

2.2. Absolute Maximum Ratings .......................................................................................................................... 11

2.3. Operating Range........................................................................................................................................... 11

2.4. Chip Specification ......................................................................................................................................... 12

2.4.1. Power Consumption ................................................................................................................................. 12

2.4.2. Frequency Synthesis ................................................................................................................................ 12

2.4.3. Receiver ................................................................................................................................................... 13

2.4.4. Digital Specification .................................................................................................................................. 14

3. Chip Description.................................................................................................................................................... 15

3.1. Power Supply Strategy.................................................................................................................................. 15

3.2. Low Battery Detector..................................................................................................................................... 15

3.3. Frequency Synthesis..................................................................................................................................... 15

3.3.1. Reference Oscillator ................................................................................................................................. 15

3.3.2. CLKOUT Output ........................................................................................................................................16

3.3.3. PLL Architecture ....................................................................................................................................... 16

3.3.4. Lock Time ..................................................................................................................................................17

3.3.5. Lock Detect Indicator................................................................................................................................ 17

3.4. Receiver Description ..................................................................................................................................... 17

3.4.1. Block Diagram .......................................................................................................................................... 17

3.4.2. LNA - Single to Differential Buffer .............................................................................................................18

3.4.3. Automatic Gain Control ............................................................................................................................ 18

3.4.4. Continuous-Time DAGC........................................................................................................................... 20

3.4.5. Quadrature Mixer - ADCs - Decimators.................................................................................................... 20

3.4.6. Channel Filter ........................................................................................................................................... 20

3.4.7. DC Cancellation ....................................................................................................................................... 21

3.4.8. Complex Filter - OOK ............................................................................................................................... 22

3.4.9. RSSI ......................................................................................................................................................... 22

3.4.10. Cordic ..................................................................................................................................................... 22

3.4.11. Bit Rate Setting ...................................................................................................................................... 22

3.4.12. FSK Demodulator ................................................................................................................................... 23

3.4.13. OOK Demodulator ...................................................................................................................................24

3.4.14. Bit Synchronizer ......................................................................................................................................26

3.4.15. Frequency Error Indicator....................................................................................................................... 26

3.4.16. Automatic Frequency Correction ............................................................................................................ 27

3.4.17. Optimized Setup for Low Modulation Index Systems ............................................................................. 28

Rev 3 - Jan 2011

Page 2

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