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User's Guide
LMX2594PSEVM Evaluation Instructions
The LMX2594PSEVM uses two LMX2594 synthesizers to generate two phase-coherent outputs with very fine
phase adjustment capability. The outputs of the synthesizers can also be combined to produce lower noise and
jitter than is possible with just one.
The LMX2594 is a high-performance, wideband synthesizer that can generate any frequency from 10 MHz to 15
GHz without using an internal doubler, thus eliminating the need for sub-harmonic filters.
1.1 Evaluation Module Contents..............................................................................................................................................
1.2 Evaluation Setup Requirement..........................................................................................................................................
1.3 Resources..........................................................................................................................................................................
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Setup........................................................................................................................................................................................4
2.1 Connection Diagram..........................................................................................................................................................
2.2 Power Supply.....................................................................................................................................................................
Clock.................................................................................................................................................................4
2.4 SYNC Input........................................................................................................................................................................
Output...........................................................................................................................................................................4
2.6
Programming......................................................................................................................................................................4
2.7 Evaluation Software...........................................................................................................................................................
Measurement..............................................................................................................................................................6
3.1 Category 3 Synchronization...............................................................................................................................................
Improvement.................................................................................................................................................7
SNAU278 - JULY 2022
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ABSTRACT
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Module.....................................................................................................................................3
Copyright © 2022 Texas Instruments Incorporated
Table of Contents
LMX2594PSEVM Evaluation Instructions
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Summary of Contents for Texas Instruments LMX2594PSEVM
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Page 1: Table Of Contents
LMX2594PSEVM Evaluation Instructions ABSTRACT The LMX2594PSEVM uses two LMX2594 synthesizers to generate two phase-coherent outputs with very fine phase adjustment capability. The outputs of the synthesizers can also be combined to produce lower noise and jitter than is possible with just one. - Page 2 9.3 Typical Output Characteristics............................9.4 Firmware Update................................18 Trademarks PLLatinum ™ is a trademark of Texas Instruments. Windows ® is a registered trademark of Microsoft Corporation. All trademarks are the property of their respective owners. LMX2594PSEVM Evaluation Instructions SNAU278 – JULY 2022 Submit Document Feedback Copyright ©...
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Page 3: Lmx2594Psevm Evaluation Module
® 7 or more recent version • An oscilloscope • A high quality signal generator • Texas Instruments Clocks and Synthesizers TICS Pro software • Texas Instruments PLLatinum ™ Simulator Tool (optional) 1.3 Resources Related evaluation and development resources include: •... -
Page 4: Setup
EVM modification. 2.6 Programming Connect the ribbon cable from the Reference PRO to the LMX2594PSEVM. Connect the USB cable from a PC to the USB port on the Reference PRO board. This provides a power supply to the Reference PRO board and communication with the TICS Pro software. A firmware update may be required. -
Page 5: Evaluation Software
Download and install TICS Pro to a PC. Run the software and follow the following steps to get started. 1. Go to Select Device → PLL + VCO → LMX2594. 2. Go to Default Configuration → Default Mode. SNAU278 – JULY 2022 LMX2594PSEVM Evaluation Instructions Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated... -
Page 6: Typical Measurement
If it is a category 3 synchronization, VCO_PHASE_SYNC should be checked to put the devices in SYNC mode. After programming, the outputs from the two LMX2594 devices may not be phase-aligned. Figure 3-2. Output Phases Before Synchronization LMX2594PSEVM Evaluation Instructions SNAU278 – JULY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated... -
Page 7: Phase Noise Improvement
3-5, the blue trace shown the phase noise of individual LMX2594 device while the black trace respresented the phase noise of the combined signal. SNAU278 – JULY 2022 LMX2594PSEVM Evaluation Instructions Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated... - Page 8 Typical Measurement www.ti.com Figure 3-5. Combined Phase Noise LMX2594PSEVM Evaluation Instructions SNAU278 – JULY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated...
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Page 9: Schematic
Schematic 4 Schematic Figure 4-1. LMX2594PSEVM Schematic (Page 1) Figure 4-2. LMX2594PSEVM Schematic (Page 2) SNAU278 – JULY 2022 LMX2594PSEVM Evaluation Instructions Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated... - Page 10 Schematic www.ti.com Figure 4-3. LMX2594PSEVM Schematic (Page 3) LMX2594PSEVM Evaluation Instructions SNAU278 – JULY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated...
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Page 11: Pcb Layout And Layer Stack-Up
FR4 (Er = 4.2) 8 mil Bottom layer Figure 5-1. PCB Layer Stack-Up 5.2 PCB Layout Figure 5-2. Top Layer Figure 5-3. GND Layer SNAU278 – JULY 2022 LMX2594PSEVM Evaluation Instructions Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated... - Page 12 PCB Layout and Layer Stack-up www.ti.com Figure 5-4. Power Layer Figure 5-5. Bottom Layer LMX2594PSEVM Evaluation Instructions SNAU278 – JULY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated...
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Page 13: Bill Of Materials
CAP, CERM, 10 µF, 16 V, EMK212BB7106KG-T Taiyo Yuden 10%, X7R, 0805 C1_LF1, C1_LF2 CAP, CERM, 390 pF, 50 V, 06035A391JAT2A 5%, C0G/NP0, 0603 SNAU278 – JULY 2022 LMX2594PSEVM Evaluation Instructions Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated... -
Page 14: Evm Modification
SMA connectors. To evaluate the phase noise improvement by summing the two outputs together, do the following modifications. • Move C13 to C13p • Move C30 to C30p Figure 7-1. EVM Modification for Phase Noise Reduction LMX2594PSEVM Evaluation Instructions SNAU278 – JULY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated... -
Page 15: Troubleshooting Guide
Verify that the EVM is in working order before you make modifications to the EVM or change the default settings • Register readback requires the correct hardware and software setup. • The POR current of the LMX2594PSEVM is approximately 400 mA. Figure 8-1. Trouble Shooting Guide SNAU278 – JULY 2022 LMX2594PSEVM Evaluation Instructions Submit Document Feedback... -
Page 16: Reference Pro
The Reference PRO board is used to program the LMX2594PSEVM and provide a clean reference clock to LMX2594PSEVM at the same time. The board has several control pins dedicated for control of output format, output frequency, and output enable control. These control pins are configurable through the jumpers by strapping the center pin to Vdd position or GND position. -
Page 17: Output Format Selection
50-Ω to VCC – 2-V termination is required on receiver. 100-Ω differential termination (R31) is provided onboard. Removing this termination is possible if the differential termination is available on the receiver. SNAU278 – JULY 2022 LMX2594PSEVM Evaluation Instructions Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated... -
Page 18: Typical Output Characteristics
Simply follow the pop-up instructions to complete the update. This is necessary to ensure that the USB connection between the PC and the Reference PRO board is properly set up, otherwise the programming to LMX2594PSEVM will not be successful. 1. When you see this message, press the OK button. - Page 19 Figure 9-8. Update Firmware 5. Press the Upgrade Firmware button to start the firmware upgrade. Press the Close button after the upgrade is complete. SNAU278 – JULY 2022 LMX2594PSEVM Evaluation Instructions Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated...
- Page 20 6. Go to USB communications → Interface to check the USB connection in TICS Pro. Make sure the USB Connected button is now green. Figure 9-10. USB Communications LMX2594PSEVM Evaluation Instructions SNAU278 – JULY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated...
- Page 21 STANDARD TERMS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms set forth herein.
- Page 22 www.ti.com Regulatory Notices: 3.1 United States 3.1.1 Notice applicable to EVMs not FCC-Approved: FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and software developers to write software applications for use with the end product.
- Page 23 www.ti.com Concernant les EVMs avec antennes détachables Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à...
- Page 24 www.ti.com EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS. 4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling or using the EVM, including without limitation any warning or restriction notices.
- Page 25 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2019, Texas Instruments Incorporated...
- Page 26 TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable warranties or warranty disclaimers for TI products. TI objects to and rejects any additional or different terms you may have proposed. IMPORTANT NOTICE Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2022, Texas Instruments Incorporated...
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