Micrel

MICRF405

April 2006

2

M9999-041906

(408) 955-1690

Table of Contents

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

Features ..................................................................................................................................................................................... 1

Applications................................................................................................................................................................................ 1

Table of Contents....................................................................................................................................................................... 2

Ordering Information .................................................................................................................................................................. 3

Block Diagram............................................................................................................................................................................ 3

Pin Configuration........................................................................................................................................................................ 4

Absolute Maximum Ratings

Operating Ratings

Electrical Characteristics ............................................................................................................................................................ 5

Electrical Characteristics (cont.)................................................................................................................................................. 6

Data and Configuration Interface ............................................................................................................................................... 7

Programming Interface Timing .............................................................................................................................................. 8

Writing to the Control Registers in MICRF405....................................................................................................................... 9

What to write: ........................................................................................................................................................................ 9

How to write:.......................................................................................................................................................................... 9

The two different ways to “program the chip” are: ................................................................................................................. 9

Writing to a Single Register ................................................................................................................................................... 9

How to write:.......................................................................................................................................................................... 9

Writing to All Registers ........................................................................................................................................................ 10

What to write ....................................................................................................................................................................... 10

How to write:........................................................................................................................................................................ 10

Writing to n Registers Having Incremental Addresses......................................................................................................... 10

What to write ....................................................................................................................................................................... 11

Writing to n Registers Having Non-Incremental Addresses................................................................................................. 12

Reading from the Control Registers in MICRF405 .............................................................................................................. 12

Reading from the Interrupt Register .................................................................................................................................... 12

Data Interface and Data Transfer............................................................................................................................................. 13

Packet Engine Overview: .................................................................................................................................................... 14

How to transmit a Packet with the Packet Engine: .............................................................................................................. 15

Programming Summary....................................................................................................................................................... 17

Main Modes of Operation......................................................................................................................................................... 18

Power Amplifier ........................................................................................................................................................................ 18

Frequency Synthesizer............................................................................................................................................................. 19

Crystal Oscillator (XCO) ........................................................................................................................................................... 21

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

Charge Pump and PLL Filter.................................................................................................................................................... 24

Modulation................................................................................................................................................................................ 27

Bit rate settings.................................................................................................................................................................... 30

Modulator ............................................................................................................................................................................ 30

Deviation setting.................................................................................................................................................................. 31

Shaping ............................................................................................................................................................................... 31

Modulator saturation............................................................................................................................................................ 31

Lock Detect ......................................................................................................................................................................... 32

Low Dropout Regulator (LDO) and Low Battery Detector.................................................................................................... 33

Bit Description .......................................................................................................................................................................... 34

Typical Application Circuit ........................................................................................................................................................ 42

Package Information ................................................................................................................................................................ 45