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The LMX2572EVM is design to evaluate the performance of LMX2572. This board consists of a LMX2572
device.
The LMX2572 is a low-power, high-performance wideband synthesizer that can generate any frequency
from 12.5 MHz to 6.4 GHz without using an internal VCO doubler. The PLL delivers excellent performance
while consuming just 75 mA from a single 3.3-V supply.
1
LMX2572EVM Evaluation Module
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2
Setup
3
Typical Measurement
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4
Schematic
5
PCB Layout and Layer Stack-up
6
Bill of Materials
7
Troubleshooting Guide
Appendix A
Using Different Reference Clock
Appendix B
Reference PRO
1
EVM Connection Diagram
2
Select Device in TICS Pro
3
Default Mode
4
MUXout_SW Switch
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5
Loop Filter
6
Default Output
7
Phase Adjustment Setting
SNAU217A – August 2017 – Revised November 2017
Submit Documentation Feedback
LMX2572EVM Evaluation Instructions
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Copyright © 2017, Texas Instruments Incorporated
SNAU217A – August 2017 – Revised November 2017
Contents
List of Figures
LMX2572EVM Evaluation Instructions
User's Guide
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Summary of Contents for Texas Instruments LMX2572EVM
- Page 1 SNAU217A – August 2017 – Revised November 2017 LMX2572EVM Evaluation Instructions The LMX2572EVM is design to evaluate the performance of LMX2572. This board consists of a LMX2572 device. The LMX2572 is a low-power, high-performance wideband synthesizer that can generate any frequency from 12.5 MHz to 6.4 GHz without using an internal VCO doubler.
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Page 2: Table Of Contents
................Reference PRO Output Format Selection ..................Output Termination Configuration Trademarks All trademarks are the property of their respective owners. LMX2572EVM Evaluation Instructions SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 3: Setup
A PC running Windows 7 or more recent version • An oscilloscope (optional) • A high quality signal generator (optional) • Texas Instruments Clocks and Synthesizers TICS Pro software • Texas Instruments PLLatinum Simulator Tool (optional) Resources Related evaluation and development resources are as follows: •... -
Page 4: Select Device In Tics Pro
Programming Connect ribbon cable from Reference PRO to LMX2572EVM. Connect USB cable from a PC to USB port in Reference PRO. This provides power supply to Reference PRO board and communication with TICS Pro. A firmware update may be required, see Appendix B details. -
Page 5: Typical Measurement
Phase margin 48 degrees C1_LF, C3_LF Open C2_LF 15 nF C4_LF 2.2 nF R2_LF 330 Ω R3_LF, R4_LF 0 Ω SNAU217A – August 2017 – Revised November 2017 LMX2572EVM Evaluation Instructions Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 6: Phase Adjustment
Phase shift in degree = 360° × (MASH_SEED / PLL_DEN) × (P / CHDIV), where P = 2 when VCO_PHASE_SYNC_EN = 1, else P = 1. Here is an example. LMX2572EVM Evaluation Instructions SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... - Page 7 However, the frequency ramp range is limited. When using ramp, the followings need to be set accordingly: • OUT_FORCE = 1 • LD_DLY = 0 • PLL_DEN = 2 – 1 SNAU217A – August 2017 – Revised November 2017 LMX2572EVM Evaluation Instructions Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated...
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Page 8: Calibration-Free Automatic Ramp Setting
Set RAMP_EN = 1 to start ramping. Set RAMP_EN = 0 to turn off ramping. Figure 9. Calibration-Free Automatic Ramp Setting Figure 10. Calibration-Free Automatic Ramp LMX2572EVM Evaluation Instructions SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 9: Automatic Ramp Setting
CAL_CLK_DIV RAMP_THRESH 40 MHz Pause time for VCO calibration 500 µs Figure 11. Automatic Ramp Setting Figure 12. Automatic Ramp SNAU217A – August 2017 – Revised November 2017 LMX2572EVM Evaluation Instructions Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 10: Sysref Pulsed Mode Setting
VCO_PHASE_SYNC_EN = 1. Here is an example of Pulsed mode. Figure 13. SYSREF Pulsed Mode Setting Figure 14. SYSREF Pulsed Mode LMX2572EVM Evaluation Instructions SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 11: Fsk Spi Fast Mode Setting
Keep writing to the FSK_SPI_FAST_DEV register field the correct values, the output of LMX2572 is a discrete 4-level FSK modulation signal. Figure 15. FSK SPI FAST Mode Setting Figure 16. FSK SPI FAST Mode SNAU217A – August 2017 – Revised November 2017 LMX2572EVM Evaluation Instructions Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 12: Readback Setting
3. Click on the Register Name that you want to read back. 4. Click the Read Register button to read back the register value. Figure 18. Register Readback LMX2572EVM Evaluation Instructions SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 13: Lmx2572Evm Schematic
Schematic www.ti.com Schematic Figure 19. LMX2572EVM Schematic (Page 1) SNAU217A – August 2017 – Revised November 2017 LMX2572EVM Evaluation Instructions Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 14: Lmx2572Evm Schematic
Schematic www.ti.com Figure 20. LMX2572EVM Schematic (Page 2) LMX2572EVM Evaluation Instructions SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 15: Pcb Layer Stack-Up
FR4 (Er = 4.6) Power layer FR4 (Er = 4.6) Bottom layer Figure 21. PCB Layer Stack-Up PCB Layout Figure 22. Top Layer SNAU217A – August 2017 – Revised November 2017 LMX2572EVM Evaluation Instructions Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... - Page 16 PCB Layout and Layer Stack-up www.ti.com Figure 23. GND Layer Figure 24. Power Layer LMX2572EVM Evaluation Instructions SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated...
- Page 17 PCB Layout and Layer Stack-up www.ti.com Figure 25. Bottom Layer SNAU217A – August 2017 – Revised November 2017 LMX2572EVM Evaluation Instructions Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated...
- Page 18 Johnson High Performance, Wideband PLLatinum LMX2572RHAR Texas Instruments RF Synthesizer uWire Header (shrouded), 100 mil, 5x2, Gold 52601-S10-8LF plated, SMD LMX2572EVM Evaluation Instructions SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated...
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Page 19: Troubleshooting Guide
• Register readback requires the correct hardware and software setup. See Section 3.2.6 for details. • The POR current of the LMX2572EVM is approximately 30 mA. • The powerdown current of the LMX2572EVM is approximately 2.5 mA. Start Congratulation! Device locked Verify hardware setup: Validate power supply is connected, turned on, and current limit is appropriate for the device. -
Page 20: Reference Clock Input Configuration
SNAU217A – August 2017 – Revised November 2017 Using Different Reference Clock There are different options to provide a reference clock to LMX2572EVM. By default, the EVM is configured for an external single-ended clock. Table 7. Reference Clock Input Configuration... -
Page 21: Reference Pro Output Frequency Selection
SNAU217A – August 2017 – Revised November 2017 Reference PRO The Reference PRO board is used to program the LMX2572EVM and at the same time, provide a clean reference clock to LMX2572EVM. The board has several control pins dedicated for control of output format, output frequency, and output enable control. -
Page 22: Output Termination Schematic
100-Ω differential termination (R31) is provided onboard. Removing this termination is possible if the differential termination is available on the receiver. Figure 27. Output Termination Schematic Reference PRO SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 23: Default Output Phase Nosie
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 setup, otherwise the programming to LMX2572EVM will not be successful. 1. When you see this message, click the "OK" button. -
Page 24: Firmware Loader
3. The BSL button is located next to the USB connector. Figure 32. BSL Button 4. Follow the on-screen procedure until the below screen is pop-up. Reference PRO SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 25: Update Firmware
6. Check the USB connection in TICS Pro by clicking USB communications → Interface. Make sure the USB Connected button is turned green. SNAU217A – August 2017 – Revised November 2017 Reference PRO Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 26: Usb Communications
Firmware Update www.ti.com Figure 35. USB Communications Reference PRO SNAU217A – August 2017 – Revised November 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... -
Page 27: Revision History
• Added register readback example ......................• Added troubleshooting guide ..............• Changed the graphic of single-ended input with crystal oscillator SNAU217A – August 2017 – Revised November 2017 Revision History Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated... - Page 28 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 29 FCC Interference Statement for Class B EVM devices NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
- Page 30 【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 開発キットの中には技術基準適合証明を受けて いないものがあります。 技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの 措置を取っていただく必要がありますのでご注意ください。 1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用 いただく。 2. 実験局の免許を取得後ご使用いただく。 3. 技術基準適合証明を取得後ご使用いただく。 なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。 上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。 日本テキサス・イ ンスツルメンツ株式会社 東京都新宿区西新宿６丁目２４番１号 西新宿三井ビル 3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page 電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧ください。http:/ /www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page 3.4 European Union 3.4.1 For EVMs subject to EU Directive 2014/30/EU (Electromagnetic Compatibility Directive): This is a class A product intended for use in environments other than domestic environments that are connected to a low-voltage power-supply network that supplies buildings used for domestic purposes.
- Page 31 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 © 2017, Texas Instruments Incorporated...
- Page 32 IMPORTANT NOTICE FOR TI DESIGN INFORMATION AND RESOURCES Texas Instruments Incorporated (‘TI”) technical, application or other design advice, services or information, including, but not limited to, reference designs and materials relating to evaluation modules, (collectively, “TI Resources”) are intended to assist designers who are developing applications that incorporate TI products;...
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