ADF7020
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Image Rejection Calibration..................................................... 26
Transmit Protocol and Coding Considerations ..................... 27
Device Programming after Initial Power-Up ......................... 27
Interfacing to Microcontroller/DSP ........................................ 27
Power Consumption and battery lifetime calculations......... 28
Serial Interface ................................................................................ 31
Readback Format........................................................................ 31
Registers........................................................................................... 32
Register 0—N Register............................................................... 32
Register 1—Oscillator/Filter Register...................................... 33
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
General Description ......................................................................... 4
Specifications..................................................................................... 5
Timing Characteristics..................................................................... 8
Timing Diagrams.......................................................................... 8
Absolute Maximum Ratings.......................................................... 10
ESD Caution................................................................................ 10
Pin Configuration and Function Descriptions........................... 11
Typical Performance Characteristics ........................................... 13
Frequency Synthesizer ................................................................... 15
Reference Input........................................................................... 15
Choosing Channels for Best System Performance................. 17
Transmitter ...................................................................................... 18
RF Output Stage.......................................................................... 18
Modulation Schemes.................................................................. 18
Receiver............................................................................................ 20
RF Front End............................................................................... 20
RSSI/AGC.................................................................................... 21
FSK Demodulators on the ADF7020....................................... 21
FSK Correlator/Demodulator................................................... 21
Linear FSK Demodulator .......................................................... 23
AFC .............................................................................................. 23
Automatic Sync Word Recognition ......................................... 24
Applications Information .............................................................. 25
LNA/PA Matching...................................................................... 25
Register 2—Transmit Modulation Register (ASK/OOK
Mode)........................................................................................... 34
Register 2—Transmit Modulation Register (FSK Mode) ..... 35
Register 2—Transmit Modulation Register (GFSK/GOOK
Mode)........................................................................................... 36
Register 3—Receiver Clock Register ....................................... 37
Register 4—Demodulator Setup Register ............................... 38
Register 5—Sync Byte Register................................................. 39
Register 6—Correlator/Demodulator Register ...................... 40
Register 7—Readback Setup Register...................................... 41
Register 8—Power-Down Test Register .................................. 42
Register 9—AGC Register......................................................... 43
Register 10—AGC 2 Register.................................................... 44
Register 11—AFC Register ....................................................... 44
Register 12—Test Register......................................................... 45
Register 13—Offset Removal and Signal Gain Register ....... 46
Outline Dimensions....................................................................... 47
Ordering Guide .......................................................................... 47
Rev. D | Page 2 of 48
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