Texas Instruments LMX2615EVM-CVAL User Manual
LMX2615EVM-CVAL Wideband 15-GHz Synthesizer
User's Guide
Literature Number: SNAU218
November 2018
Contents
1 Evaluation Board Setup and Description ................................................................................ 4
2 Setting Up the Software ........................................................................................................ 5
3 Bringing LMX2615 to a Lock State ......................................................................................... 6
4 Current Loop Filter Configuration .......................................................................................... 7
5 Typical Phase Noise............................................................................................................. 8
Appendix A Schematic................................................................................................................ 10
Appendix B Bill of Materials......................................................................................................... 11
Appendix C PCB Board Specifications.......................................................................................... 13
Appendix D Proper Jumper and Switch Positions .......................................................................... 18
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Table of Contents
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User's Guide
SNAU218–November 2018
LMX2615EVM-CVAL Wideband 15-GHz Synthesizer
SNAU218–November 2018
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Figure 1. LMX2615EVM-CVAL
LMX2615EVM-CVAL Wideband 15-GHz Synthesizer
Copyright © 2018, Texas Instruments Incorporated
3
+3.3 V
To Spectrum
Analyzer
50 :
Termination
100 MHz Input
Reference
Lock Detect
LED
Readback/
Lock Detect
Selector
Switch
Reference Pro
SPI interface
FS Switches
Power
Jumpers
Evaluation Board Setup and Description
1 Evaluation Board Setup and Description
SPACER
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1. Power:
2. Input Signal
3. Programming Interface:
4. Output:
Figure 2. LMX2615EVM Setup and Description
a. Set power supply to 3.3 V with 600-mA current limit and connect to VCCSMA.
a. The EVM is designed for a 100-MHz input reference that should be connected to the OSCin SMA.
Some of the options for this could be a signal generator, the 100 MHz output from the Reference
Pro board, or a very clean signal source such as the Wenzel 501-4623G ultra-low phase noise 100
MHz reference
• Reference Pro will provide SPI interface to program LMX2615. If using this, Connect USB cable
from laptop or PC to USB port in Reference Pro. This provides power to Reference Pro Board and
communication with TICS GUI
• The other option is to use the dip switch on the board to use Pin mode.
1. Connect RFoutAP to a phase noise analyzer and connect a 50-Ω terminator to RFoutAM.
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LMX2615EVM-CVAL Wideband 15-GHz Synthesizer
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2 Setting Up the Software
1. Download the TICS Pro from the TI Website at www.ti.com/tool/TICSPRO-SW and install.
2. From the menu bar choose Select Device → PLL + VCO → LMX2615
3. Verify the communication setup with Reference Pro. To do this, select USB communications →
Interface . Click on the identify button and the LED on the Reference Pro should blink.
Setting Up the Software
Figure 3. Search for LMX2615 on TICS Pro
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Bringing LMX2615 to a Lock State
3 Bringing LMX2615 to a Lock State
Load the default mode as shown in Figure 4 The PLL GUI tab gives useful feedback to the user that is
helpful in getting the best performance out of the device
• Items highlighted in orange or red indicate that something may be sub-optimal. To view the comment,
simply mouse over the colored item and a tooltip will appear. In this case, the feedback suggests that
CAL_CLK_DIV and VCO_SEL can be adjusted to improve the VCO calibration time, SEG1_EN could
be disabled for better spurs and lower current, and that FCAL_EN should be toggled to calibrate the
VCO.
• Mouse over any item and it will display the field value in the lower left corner including the field name,
register location, and description.
• On the bottom is the status bar, which indicates when registers are written to and the status of the
USB2ANY/Reference Pro board. In this case, it is indicating that there is no board connected.
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Figure 4. TICS Pro GUI LMX2615 Default Configuration
The GUI gives useful feedback to the user to help understand how to program and get the best
performance out of the de
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LMX2615EVM-CVAL Wideband 15-GHz Synthesizer
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SNAU218–November 2018
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