Texas Instruments LMX2430 User manual

LMX2430/33/34 Evaluation Board
User's Guide
November 2013
SNAU049A

2 SNAU049A LMK2430/33/34 Family November 2013
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LMX2430/33/34
Evaluation Board Instructions

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TABLE OF CONTENTS
E QUIPMENT .................................................................................................................................................................4 
B ASIC O PERATION .......................................................................................................................................................5 
LMX243 X B OARD I NFORMATION ...............................................................................................................................7 
LMX2430 M EASUREMENTS ........................................................................................................................................8 
LMX2433 M EASUREMENTS ......................................................................................................................................10 
LMX2434 M EASUREMENTS ......................................................................................................................................12 
A PPENDIX A: S CHEMATIC .........................................................................................................................................14 
A PPENDIX B: B UILD D IAGRAM .................................................................................................................................15 
A PPENDIX C: F ABRICATION AND A SSEMBLY ............................................................................................................20 
A PPENDIX D: B ILL OF M ATERIALS ............................................................................................................................20
A
PPENDIX E: Q UICK S TART FOR EVM C OMMUNICATIONS .......................................................................................22 

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Equipment
Power Supply
The Power Supply should be a low noise power supply. An Agilent 6623A Triple power supply with LC filters on
the output to reduce noise was used in creating these evaluation board instructions.
Signal Generator
The Signal Generator should be capable of frequencies and power level required for the part. A Rohde &
Schwarz SML03 was used in creating these evaluation board instructions.
Phase Noise / Spectrum Analyzer
For measuring phase noise an Agilent E5052A is recommended. An Agilent E4445A PSA Spectrum Analyzer
with the Phase Noise option is also usable although the architecture of the E5052A is superior for phase noise
measurements. At frequencies less than 100 MHz the local oscillator noise of the PSA is too high and
measurements will be of the local oscillator, not the device under test.
Oscilloscope
The oscilloscope and probes should be capable of measuring the output frequencies of interest when
evaluating this board. The Agilent Infiniium DSO81204A was used in creating these evaluation board
instructions.

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Basic Operation
1. Connect the signal generator output to the OSCin input of the board. For this example we use a 10
MHz sin signal at +5dBm power level.
2. Connect a low noise 5.0 V power supply to the Vcc connector located at the top left of the board.
3. Please see Appendix C for quick start on interfacing the board. Connect PC to the uWire header.
5.0V
Power
Supply
Vcc
Signal
Generator
SMA
Cable
SMA
Cable
OSCin
10MHz
1
2
LaptoporPC
LaptoporPC
3
Pleasesee
AppendixDfor
interfaceinfo
Pleasesee
AppendixDfor
interfaceinfo
4. Run CodeLoader4.exe
5. Select the Device on board by “Select Device” “PLL-Dual integer” LMX24xx

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6. On the “RF PLL” Tab, make sure Reference Oscillator is 10 MHz and output frequency is set to within the
range of the VCO on the board. Press “Enter” after making a change.
7. To program the settings into the device, Click “Keyboard Controls” “Load Device”, or Press CTRL + L

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LMX243x Board Information
Parameter LMX2430 LMX2433 LMX2434
VCO Frequency
(MHz) 1600 – 1675 3200 - 3400 4690 - 4890
VCO Gain
(MHz/V) 32 90 94
Charge Pump Gain (mA) 4 4 4
VCO Input Capacitance 39 22 12
Phase Detector Frequency (MHz) 1 1 1
OSCin Frequency (MHz) 100 100 100
Loop Bandwidth (kHz) 27.9 31.1 41.2
Phase Margin (deg) 56.8 59.6 58.4
Gamma 0.57 0.90 0.87
T3/T1 Ratio (%) 220.8 177.1 213.9
C1_LF (nF) 0.18 0.27 0.1
C2_LF (nF) 6.8 10 3.9
C3_LF (nF) 1 1 1
C4_LF (nF) Open Open Open
R2_LF (Kohm) 2.2 1.8 3.3
R3_LF (Kohm) 0.82 0.82 0.68
R4_LF (Kohm) 0 0 0
Closed Loop Transfer Function
-60
-40
-20
0
20
40
60
80
1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
Offset (Hz)
Closed Loop Gain (dB)
LMX2430 LMX2433 LMX2434

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LMX2430 Measurements

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Spur at 1600 MHz VCO
frequency is -79.9 dBc.
Spur at 1650 MHz VCO
frequency is -79.5 dBc. Note
that this spur is not
symmetrical.
Spur at 1675 MHz VCO
frequency is -77.6 dBc.

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LMX2433 Measurements