Table of Contents

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AX5042

3

VCO Auto-Ranging ........................................................................................................................ 21

Loop Filter and Charge Pump ...................................................................................................... 22

Registers ............................................................................................................................................ 22

5.7. RF Input and Output Stage (ANTP/ANTN).................................................................................. 22

LNA..................................................................................................................................................... 22

I/Q mixer ........................................................................................................................................... 22

PA ....................................................................................................................................................... 22

5.8. Analog IF Filter ................................................................................................................................. 23

5.9. Digital IF Channel Filter and Demodulator ................................................................................ 23

Registers ............................................................................................................................................ 23

5.10.

Encoder....................................................................................................................................... 24

5.11.

Framing and FIFO...................................................................................................................... 24

HDLC Mode...................................................................................................................................... 25

RAW Mode ....................................................................................................................................... 25

802.15.4 (ZigBee) DSSS.................................................................................................................... 26

5.12.

RX AGC and RSSI....................................................................................................................... 26

5.13.

Modulator................................................................................................................................... 27

5.14.

Automatic Frequency Control (AFC).................................................................................... 27

5.15.

PWRMODE Register................................................................................................................... 28

5.16.

Serial Peripheral Interface (SPI) .............................................................................................. 30

SPI Timing .......................................................................................................................................... 30

5.17.

Wire Mode Interface ................................................................................................................ 31

Wire Mode Timing ........................................................................................................................... 31

6. Register Bank Description .........................................................................................................32

6.1. Control Register Map..................................................................................................................... 33

7. Application Information ............................................................................................................36

7.1. Typical Application Diagram ....................................................................................................... 36

7.2. Antenna Interface Circuitry.......................................................................................................... 37