ADF7025
TABLE OF CONTENTS
Features .............................................................................................. 1
Automatic Sync Word Recognition ......................................... 22
Applications Section....................................................................... 23
LNA/PA Matching...................................................................... 23
Transmit Protocol and Coding Considerations ..................... 24
Device Programming after Initial Power-Up............................. 24
Interfacing to Microcontroller/DSP ........................................ 24
Serial Interface ................................................................................ 27
Readback Format........................................................................ 27
Registers........................................................................................... 28
Register 0—N Register............................................................... 28
Register 1—Oscillator/Filter Register...................................... 29
Register 2—Transmit Modulation Register ............................ 30
Register 3—Receiver Clock Register ....................................... 31
Register 4—Demodulator Setup Register ............................... 32
Register 5—Sync Byte Register................................................. 33
Register 6—Correlator/Demodulator Register ...................... 34
Register 7—Readback Setup Register...................................... 35
Register 8—Power-Down Test Register .................................. 36
Register 9—AGC Register......................................................... 37
Register 10—AGC 2 Register.................................................... 38
Register 12—Test Register......................................................... 39
Register 13—Offset Removal and Signal Gain Register ....... 40
Outline Dimensions....................................................................... 41
Ordering Guide .......................................................................... 41
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
General Description......................................................................... 3
Specifications..................................................................................... 4
Timing Characteristics..................................................................... 7
Timing Diagrams.......................................................................... 7
Absolute Maximum Ratings............................................................ 9
ESD Caution.................................................................................. 9
Pin Configuration and Function Descriptions........................... 10
Typical Performance Characteristics ........................................... 12
Frequency Synthesizer ................................................................... 15
Reference Input Section............................................................. 15
Choosing Channels for Best System Performance................. 17
Transmitter ...................................................................................... 18
RF Output Stage.......................................................................... 18
Modulation Scheme ................................................................... 18
Receiver............................................................................................ 19
RF Front End............................................................................... 19
RSSI/AGC.................................................................................... 20
FSK Demodulators on the ADF7025....................................... 20
FSK Correlator/Demodulator................................................... 20
Linear FSK Demodulator .......................................................... 22
REVISION HISTORY
2/06—Rev. 0 to Rev. A
Replaced Figure 40 ................................................................ Page 29
1/06—Revision 0: Initial Version
Rev. A | Page 2 of 44
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