Datasheet

LMX2531LQ2820E EVALUATION BOARD OPERATING INSTRUCTIONS
Table of Contents
Table of Contents ................................................................................................................ 2
Loop Filter .......................................................................................................................... 3
Quick Setup ......................................................................................................................... 3
Troubleshooting .................................................................................................................. 4
SOFTWARE DOES NOT COMMUNICATE WITH THE EVALUATION BOARDS ....................................................... 4
PART RESPONDS TO PROGRAMMING, BUT DOES NOT LOCK TO THE CORRECT FREQUENCY ............................ 4
CLOSE-IN PHASE NOISE IS WORSE THAN EVALUATION BOARD INSTRUCTIONS SHOW .................................... 4
FAR-OUT PHASE NOISE IS WORSE THAN EVALUATION BOARD INSTRUCTIONS SHOW .................................... 5
Device Data ......................................................................................................................... 5
PHASE NOISE ............................................................................................................................................... 6
FREE-RUNNING VCO PHASE NOISE (INTERNAL DIVIDE BY 2 DISABLED) .................................................... 7
FREE-RUNNING VCO PHASE NOISE (INTERNAL DIVIDE BY 2 ENABLED) ..................................................... 8
FRACTIONAL SPURS (INTERNAL DIVIDE BY 2 DISABLED) ............................................................................ 9
FRACTIONAL SPURS (INTERNAL DIVIDE BY 2 ENABLED) ........................................................................... 10
INTEGER SPURS (INTERNAL DIVIDE BY 2 DISABLED) ................................................................................. 11
INTEGER SPURS (INTERNAL DIVIDE BY 2 ENABLED) .................................................................................. 12
IN-BAND FACTIONAL SPURS INTEGER SPURS (INTERNAL DIVIDE BY 2 DISABLED) .................................... 13
IN-BAND FACTIONAL SPURS INTEGER SPURS (INTERNAL DIVIDE BY 2 ENABLED) ..................................... 14
Inter-modulation Spurs ............................................................................................. 15
CodeLoader Settings ......................................................................................................... 16
SELECT DEVICE .......................................................................................................................................... 16
BITS/PINS ................................................................................................................................................... 18
PLL/VCO .................................................................................................................................................. 19
REGISTERS ................................................................................................................................................. 20
PORT SETUP ............................................................................................................................................... 21
Schematic .......................................................................................................................... 22
Bill of Materials ................................................................................................................ 23
Top Layer .......................................................................................................................... 24
Mid Layer 1 "Ground Plane" ............................................................................................ 25
Mid Layer 2 "Power" ........................................................................................................ 26
Bottom Layer "Signal" ...................................................................................................... 27
Top Build Diagram ........................................................................................................... 28
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