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AX5051

2

Table of Contents

1. Overview..................................................................................................... 5

1.1. Features ....................................................................................................... 5

1.2. Applications .................................................................................................. 5

2. Block Diagram............................................................................................. 6

3. Pin Function Descriptions ........................................................................... 7

3.1. Pin-out Drawing ............................................................................................ 8

4. Specifications.............................................................................................. 9

4.1. Absolute Maximum Ratings ............................................................................. 9

4.2. DC Characteristics ........................................................................................10

Supplies.......................................................................................................10

Logic ...........................................................................................................12

4.3. AC Characteristics.........................................................................................13

Crystal Oscillator...........................................................................................13

RF Frequency Generation Subsystem (Synthesizer) ...........................................14

Transmitter ..................................................................................................16

Receiver ......................................................................................................16

SPI Timing ...................................................................................................18

5. Circuit Description .................................................................................... 19

5.1. Voltage Regulator .........................................................................................20

5.2. Crystal Oscillator ..........................................................................................20

5.3. SYSCLK Output ............................................................................................21

5.4. Power-on-reset (POR) and RESET_N Input.......................................................21

5.5. RF Frequency Generation Subsystem ..............................................................21

VCO ............................................................................................................22

VCO Auto-Ranging ........................................................................................22

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