Micrel, Inc.

MICRF507

March 2010

2

M9999-032210-B

RadioWire

Ordering Information .........................................................................................................................................................4

Block Diagram ....................................................................................................................................................................4

Pin Configuration ...............................................................................................................................................................5

Pin Description...................................................................................................................................................................5

Absolute Maximum Ratings

Operating Ratings

Electrical Characteristics

Functional Description ....................................................................................................................................................10

Control (3-wire) Interface ......................................................................................................................................10

Reading.................................................................................................................................................................13

Control Interface Timing........................................................................................................................................14

Power-on Reset ....................................................................................................................................................14

Clock Generation .............................................................................................................................................................15

Crystal Oscillator (XCO) ..................................................................................................................................................16

BITSYNC_CLK (Receiver Bit Synchronization Clock)..........................................................................................17

BITRATE_CLK (Transmitter Bit Rate Clock) ........................................................................................................17

MODULATOR_CLK (VCO Modulator Clock)........................................................................................................17

Data Interface and Bit Synchronization .........................................................................................................................17

Sync_en = 0 ..........................................................................................................................................................19

Sync_en = 1 ..........................................................................................................................................................19

Additional Considerations in the Use of Synchronizer (Sync_en = 1) ..................................................................19

Frequency Synthesizer....................................................................................................................................................20

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

Charge Pump ........................................................................................................................................................22

PLL Filter...............................................................................................................................................................22

Lock Detect ...........................................................................................................................................................23

Receiver ............................................................................................................................................................................24

Front End...............................................................................................................................................................24

Sallen-Key Filters ..................................................................................................................................................25

Switched Capacitor Filter ......................................................................................................................................25

RSSI ......................................................................................................................................................................25

FEE .......................................................................................................................................................................26

XCOtune Procedure Example .........................................................................................................................................27

Transmitter........................................................................................................................................................................28

Power Amplifier .....................................................................................................................................................28

Frequency Modulation...........................................................................................................................................29

Divider Modulation ................................................................................................................................................30

VCO Modulation and the Modulator......................................................................................................................30

Modulator Filter .....................................................................................................................................................32

System Modes and Initialization.....................................................................................................................................33

Start-up and Initialization.......................................................................................................................................33

Modes of Operation...............................................................................................................................................33

Mode Transitions...................................................................................................................................................33

Message Coding and Formatting ...................................................................................................................................34

DC Balanced Line Coding.....................................................................................................................................34

Message Formatting: Preamble............................................................................................................................34