LMX2531-xxxx Evaluation Board
User's Guide
November 2013
SNAU077A
LMX2531-xxxx
High Performance Frequency Synthesizer System with Integrated VCO
Evaluation Board Operating Instructions
2 SNAU077A LMX2531-xxxx Evaluation Board User’s Guide November 2013
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TABLE OF CONTENTS
EQUIPMENT.................................................................................................................................................................................. 4
BASIC OPERATION ....................................................................................................................................................................... 5
LMX2531-XXXX BOARD INFORMATION ...................................................................................................................................... 7
APPENDIX A: SCHEMATICS......................................................................................................................................................... 27
APPENDIX B: BUILD DIAGRAM................................................................................................................................................... 28
APPENDIX C: QUICK START ON EVM COMMUNICATION ........................................................................................................... 30
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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.
4 SNAU077A LMX2531-xxxx Evaluation Board User’s Guide November 2013
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Laptop or PC
Laptop or PC
Power
Supply
Power
Cable
Power
Cable
3.0 V
Sig Gen
SMA
cable
SMA
cable
1
3
Please see
Appendix D for
interface info
Please see
Appendix D for
interface info
2
OSCin
Vcc
uWire
header
10 MHz @
+5 dBm
Appendix C for
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 3.3 V power supply to the Vcc connector located at the top left of the board.
3. Please see Appendix D for quick start on interfacing the board. Connect PC to the uWire header.
4. Start CodeLoader4.exe.
5. Select USB or LPT Communication Mode on the Port Setup tab as appropriate.
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6. Click “Select Device” “PLL-VCO” LMX2531xxxx depending on which chip is on your board.
7. Check your window with “PLL/VCO” Tab screenshot, 10 MHz input, but with VCO output will be different
depending on which LMX2531xxxx you selected
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RF LOOP FILTER
42.5 deg
100 uA
Loop Bandwidth
4.1 kHz
Fcomp
2.5 MHz
TCXO Frequency
10 MHz
Output Frequency
1712 – 1772 MHz
VCO Gain
7.9-84.7i kHz
Supply Voltage
2.7 Volts
VCO
CPout
47 pF
2.7 nF
47 K
100 pF 100 pF
40 K 40 K
Vtune
LMX2531-xxxx Board Information
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LMX2531-xxxx
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LMX2531-1570 Spurs
1540 MHz
1570 MHz
1600 MHz
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LMX2531-1742 Spurs
1712 MHz
1742 MHz
1772 MHz
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LMX2531-1778 Spurs
1748 MHz
1778 MHz
1808 MHz
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LMX2531-1950 Spurs
1920 MHz
1950 MHz
1980 MHz
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LMX2531-2140 Spurs
2110 MHz
2140 MHz
2170 MHz
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LMX2531-2265 Spurs
2235 MHz
2265 MHz
2295 MHz
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LMX2531-2294 Spurs
2264 MHz
2294 MHz
2324 MHz
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LMX2531-1570 Lock Time
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LMX2531-1742 Lock Time
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LMX2531-1778 Lock Time
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LMX2531-1950 Lock Time
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LMX2531-2140 Lock Time
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LMX2531-2265 Lock Time
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LMX2531-2294 Lock Time
rsf
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November 2013 LMX2531-xxxx Evaluation Board User’s Guide SNAU077A 27
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Appendix A: Schematics
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Appendix B: Build Diagram
Top Overlay
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Bottom Overlay
Appendix C: Quick Start on EVM Communication
Codeloader is the software used to communicate with the EVM (Please download the latest version from
TI.com - http://www.ti.com/tool/codeloader). This EVM can be controlled through the uWire interface on
board. There are two options in communicating with the uWire interface from the computer.
OPTION 1
Open Codeloader.exe Click “Select Device” Click “Port Setup” tab Click “LPT” (in Communication Mode)
OPTION 2
November 2013 LMX2531-xxxx Evaluation Board User’s Guide SNAU077A 30
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EVM
Jumper Bank
Code Loader Configuration
A B C D E F G
H LMX2581
A4
B1
C2 E5
F1
G1
H1
BUFEN (pin 1), Trigger (pin 7)
LMX2541
A4 C3 E4
F1
G1
H1
CE (pin 1), Trigger (pin 10)
LMK0400x
A0 C3 E5
F1
G1
H1
GOE (pin 7)
LMK01000
A0 C1 E5
F1
G1
H1
GOE (pin 7)
LMK030xx
A0 C1 E5
F1
G1
H1
SYNC (pin 7)
LMK02000
A0 C1 E5
F1
G1
H1
SYNC (pin 7)
LMK0480x
A0
B2
C3 E5
F0
G0
H1
Status_CLKin1 (pin 3)
LMK04816/4906
A0
B2
C3 E5
F0
G0
H1
Status_CLKin1 (pin 3)
LMK01801
A0
B4
C5 E2
F0
G0
H1
Test (pin 3), SYNC0 (pin 10)
LMK0482x (prelease)
A0
B5
C3
D2
E4
F0
G0
H1
CLKin1_SEL (pin 6), Reset (pin 10)
LMX2531
A0 E5
F2
G1
H2
Trigger (pin 1)
LMX2485/7
A0 C1 E5
F2
G1
H0
ENOSC (pin 7), CE (pin 10)
LMK03200
A0 E5
F0
G0
H1
SYNC (pin 7)
LMK03806
A0 C1 E5
F0
G0
H1 LMK04100
A0 C1 E5
F1
G1
H1
The Adapter Board
This table describes the pins configuration on the adapter board for each EVM board (See examples below table)
Example adapter configuration (LMK01801)
Open Codeloader.exe Click “Select Device” Click “Port Setup” Tab Click “USB” (in Communication Mode)
*Remember to also make modifications in “Pin Configuration” Section according to Table above.
November 2013 LMX2531-xxxx Evaluation Board User’s Guide SNAU077A 31
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