Micrel

MICRF505LYML

August 2006

2

M9999-092904

+1 408-944-0800

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

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

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

RadioWire® RF Selection Guide ........................................................................................................................... 4

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

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

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

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

Absolute Maximum Ratings

Operating Ratings

Electrical Characteristics

Programming.......................................................................................................................................................... 9

Writing to the control registers in MICRF505 ....................................................................................................... 10

Writing to a Single Register ................................................................................................................................. 10

Writing to All Registers......................................................................................................................................... 11

Writing to n Registers having Incremental Addresses ......................................................................................... 11

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

Reading from the control registers in MICRF505 ................................................................................................ 12

Programming interface timing .............................................................................................................................. 12

Power on Reset.................................................................................................................................................... 13

Programming summary........................................................................................................................................ 14

Frequency Synthesizer ........................................................................................................................................ 15

Crystal Oscillator (XCO)

.................................................................................................................................... 16

VCO

...................................................................................................................................................................... 17

Charge Pump

...................................................................................................................................................... 18

PLL Filter

............................................................................................................................................................. 18

Lock Detect

......................................................................................................................................................... 18

Modes of Operation

........................................................................................................................................... 18

Low Dropout Regulator ........................................................................................................................................ 19

Transceiver Sync/Non-Synchronous Mode ......................................................................................................... 20

Data Interface....................................................................................................................................................... 20

Receiver ............................................................................................................................................................... 21

Front End

............................................................................................................................................................ 21

Sallen-Key Filters

............................................................................................................................................... 21

Switched Capacitor Filter

.................................................................................................................................. 22

RSSI

..................................................................................................................................................................... 22

FEE

...................................................................................................................................................................... 23

Bit Synchronizer

................................................................................................................................................. 24

Transmitter ........................................................................................................................................................... 25

Power Amplifier

.................................................................................................................................................. 25

Modulator

............................................................................................................................................................ 27

Using the XCO-tune Bits ...................................................................................................................................... 29

Typical Application ............................................................................................................................................... 31

MICRF505LBML/YML Land pattern..................................................................................................................... 32

Layout Considerations ......................................................................................................................................... 33