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Micrel, Inc.
MICRF507
RadioWire FSK Transceiver Selection Guide ................................................................................................................ 4
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Ordering Information ......................................................................................................................................................... 4
Pin Configuration ............................................................................................................................................................... 4
Pin Description ................................................................................................................................................................... 4
Block Diagram .................................................................................................................................................................... 6
Absolute Maximum Ratings .............................................................................................................................................. 7
Operating Ratings .............................................................................................................................................................. 7
Electrical Characteristics .................................................................................................................................................. 7
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
Typical Application .......................................................................................................................................................... 35
October 2, 2013
2
Revision 2.2
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