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SNAU219 – June 2017
Copyright © 2017, Texas Instruments Incorporated
LMX2595 EVM Instructions – 19-GHz Wideband Low Noise PLL With
Integrated VCO
User's Guide
SNAU219 – June 2017
LMX2595 EVM Instructions – 19-GHz Wideband Low Noise
PLL With Integrated VCO
This Evaluation Module is for the LMX2595, which is the first PLL with integrated VCO in industry to get
fundamental VCO output up to 15 GHz. The industry leading PLL FOM is -236 dBc/Hz with 1/f of -129
dBc/Hz. This device supports JESD204B standard (it can generate or repeat the SYSREF signal) which
makes it ideal to clock high speed data converters. The integrated jitter from the EVM measurements is
less than 50 fs at 9 GHz carrier frequency. By providing a SYNC signal, the user can synchronize the
output phase across multiple LMX2595 devices. LMX2595 can also generate a frequency ramp which can
be demonstrated in this evaluation module. With an on-board oscillator, setup process only requires a
3.3V power supply and an included Reference Pro module (For SPI Programming interface). The software
is simple, with an intuitive and user friendly GUI.
Figure 1. LMX2595EVM
Contents
1
Evaluation Board Setup
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2
EVM Description
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3
Bringing LMX2595 to a Lock State
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4
Current Loop Filter Configuration
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5
Key Results to Expect
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Appendix A
Schematic
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Appendix B
Bill of Materials
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Appendix C
Board Layers Stack-Up
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Appendix D
Changing Reference Oscillator and Setup
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Appendix E
Connecting Reference Pro
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Appendix F
Ramping Feature
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Appendix G
SYSREF Feature
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