Texas Instruments LMX2571EPEVM Скачать руководство пользователя страница 14 | Manualshive

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Texas Instruments LMX2571EPEVM Скачать руководство пользователя страница 14

7 Troubleshooting Guide

If the EVM does not work as expected, use the

to identify potential root causes. Consider the

following:

• Do not make modifications to the EVM or change the default settings until AFTER it is verified to be working.
• Register read back requires the correct software setup, See

for details.

• The POR current of the LMX2571EPEVM is approximately 30 mA.
• The power-down current of the LMX2571EPEVM is approximately 3 mA.

Figure 7-1. Troubleshooting Guide

Troubleshooting Guide

14

LMX2571EPEVM Evaluation Instructions

SNAU182 – MARCH 2021

Submit Document Feedback

Copyright © 2021 Texas Instruments Incorporated

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Содержание LMX2571EPEVM

Страница 1: ...has integrated LDOs that eliminate the need for onboard low noise LDOs Except for the following components this board is able to support extended temperature range testing LED uWIRE socket Header and short Ribbon cable Table of Contents 1 LMX2571EPEVM Evaluation Module 3 1 1 Evaluation Module Contents 3 1 2 Installing the EVM Software 3 1 3 Resources 3 2 Setup 4 2 1 Connection Diagram 4 2 2 Power ...

Страница 2: ...0 Figure 5 2 Top Layer 10 Figure 5 3 GND Layer 11 Figure 5 4 Signal GND Layer 11 Figure 5 5 Bottom Layer 12 Figure 7 1 Troubleshooting Guide 14 Figure A 1 Single ended Input 15 Figure A 2 Differential Input 15 Figure A 3 Crystal Oscillator Input 15 Figure B 1 Output Termination Schematic 17 Figure B 2 Default Output Phase Nosie 17 Figure B 3 Default Output Waveform 17 Figure B 4 Firmware Requireme...

Страница 3: ...lyzer A PC running Windows 7 or more recent version An oscilloscope optional 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 LMX2571 EP data sheet TICS Pro software PLLatinum Simulator Tool PLL Sim Reference PRO design file www ti com LM...

Страница 4: ...fault the output clock from Reference PRO is a 100 MHz LVPECL clock Appendix B has the details of Reference PRO 2 4 RF Output Connect RFOUTRX SMA connector to a signal analyzer Output frequency is 480 MHz and the amplitude is about 1 dBm By default the evaluation software TICS Pro has RFOUTTX power down This SMA connectors could be left open 2 5 Programming Connect ribbon cable from Reference PRO ...

Страница 5: ...position in PLL mode and provide a 5 V supply to the reserved pads for the 5 V SMA connector Figure 2 4 J11 Header 2 7 2 J12 Header Pin 2 of J12 is connected to the CE pin Put a short to the HW position this will connect the CE pin to 3V3 through resistor R38 If the short is placed in the SW position the status of CE pin is configurable through TICS Pro Figure 2 5 J12 Header www ti com Setup SNAU1...

Страница 6: ...0 MHz Loop bandwidth 205 kHz Phase margin 40 degrees C1_LF 390 pF C2_LF 4 7 nF R2_LF 680 Ω R3_LF R4_LF Internal 800 Ω C3_LF Internal 50 pF C4_LF Internal 100 pF Figure 3 1 Loop Filter 3 1 2 Typical Output 1 Follow Section 2 to set up the evaluation 2 Click Write All Registers to write all the registers to LMX2571 EP The default output is 480 MHz Figure 3 2 Default Output Typical Measurement www ti...

Страница 7: ...ided by 4 CHDIV2 Divided by 1 PLL_DEN 224 Prescalar 2 Frequency deviation 600 Hz 1800 Hz Continue to toggle the FSK_D 1 0 and FSK_DV pins the output is a discrete 4 level FSK modulated signal Figure 3 3 FSK PIN Mode Setting Figure 3 4 FSK PIN Mode 3 2 2 Register Readback To read back the written register values use the following steps 1 From the TICS Pro set SDO_LD_SEL to Lock detect output www ti...

Страница 8: ...t to read back 3 Click the Read Register button to read back the register value Figure 3 6 Register Readback Typical Measurement www ti com 8 LMX2571EPEVM Evaluation Instructions SNAU182 MARCH 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Страница 9: ...4 Schematic Figure 4 1 LMX2571EPEVM Schematic www ti com Schematic SNAU182 MARCH 2021 Submit Document Feedback LMX2571EPEVM Evaluation Instructions 9 Copyright 2021 Texas Instruments Incorporated ...

Страница 10: ...Prepreg and Core Layers The top layer is 1 oz copper Figure 5 1 PCB Layer Stack Up 5 2 PCB Layout Figure 5 2 Top Layer Board Construction www ti com 10 LMX2571EPEVM Evaluation Instructions SNAU182 MARCH 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Страница 11: ...ure 5 3 GND Layer Figure 5 4 Signal GND Layer www ti com Board Construction SNAU182 MARCH 2021 Submit Document Feedback LMX2571EPEVM Evaluation Instructions 11 Copyright 2021 Texas Instruments Incorporated ...

Страница 12: ...Figure 5 5 Bottom Layer Board Construction www ti com 12 LMX2571EPEVM Evaluation Instructions SNAU182 MARCH 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Страница 13: ...8LF FCI J8 1 Header 100mil 4x2 Gold SMT 0015910080 Molex J9 1 Header 100mil 2x1 Gold TH TSW 102 07 G S Samtec J11 J12 2 Header 100mil 3x1 Gold TH TSW 103 07 G S Samtec R1 R2 R3 R5 R6 R7 R8 R20 R21 9 RES 0 5 0 1 W AEC Q200 Grade 0 0603 CRCW06030000Z0EA Vishay Dale R2LF 1 RES 680 5 0 1 W AEC Q200 Grade 0 0603 CRCW0603680RJNEA Vishay Dale R4 R10 R11 R13 R14 5 RES 330 5 0 1 W AEC Q200 Grade 0 0603 CRC...

Страница 14: ...erified to be working Register read back requires the correct software setup See Section 3 2 2 for details The POR current of the LMX2571EPEVM is approximately 30 mA The power down current of the LMX2571EPEVM is approximately 3 mA Figure 7 1 Troubleshooting Guide Troubleshooting Guide www ti com 14 LMX2571EPEVM Evaluation Instructions SNAU182 MARCH 2021 Submit Document Feedback Copyright 2021 Texa...

Страница 15: ... EVM is configured for an external single ended clock Figure A 1 Single ended Input Figure A 2 Differential Input Figure A 3 Crystal Oscillator Input www ti com Using Different Reference Clock SNAU182 MARCH 2021 Submit Document Feedback LMX2571EPEVM Evaluation Instructions 15 Copyright 2021 Texas Instruments Incorporated ...

Страница 16: ...t Frequency Selection FS1 FS0 OUTPUT FREQUENCY MHz GND GND 100 GND NC 312 5 GND Vdd 125 NC GND 106 25 NC NC 156 25 NC Vdd 212 5 Vdd GND 62 5 B 2 Output Format Selection The OE pin is used to enable or disable the output The OS pin is used to bias internal drivers and change the output format Table B 2 Reference PRO Output Format Selection OE OS OUTPUT FORMAT GND Don t Care Disabled Vdd GND LVPECL ...

Страница 17: ...cal Output Characteristics Figure B 2 Default Output Phase Nosie Figure B 3 Default Output Waveform B 4 Firmware Update Usually when the Reference PRO board is used at the first time TICS Pro will request for a firmware update 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...

Страница 18: ...ton 4 Follow the on screen procedure until the below screen is pop up Figure B 7 Update Firmware 5 Click the Upgrade Firmware button the firmware will be upgrading Click the Close button after the upgrade is complete Reference PRO www ti com 18 LMX2571EPEVM Evaluation Instructions SNAU182 MARCH 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Страница 19: ...o by clicking USB communications Interface Make sure the USB Connected button is now green Figure B 9 USB Communications www ti com Reference PRO SNAU182 MARCH 2021 Submit Document Feedback LMX2571EPEVM Evaluation Instructions 19 Copyright 2021 Texas Instruments Incorporated ...

Страница 20: ...other than TI b the nonconformity resulted from User s design specifications or instructions for such EVMs or improper system design or c User has not paid on time Testing and other quality control techniques are used to the extent TI deems necessary TI does not test all parameters of each EVM User s claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects...

Страница 21: ... These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation...

Страница 22: ...y for convenience and should be verified by User 1 Use EVMs in a shielded room or any other test facility as defined in the notification 173 issued by Ministry of Internal Affairs and Communications on March 28 2006 based on Sub section 1 1 of Article 6 of the Ministry s Rule for Enforcement of Radio Law of Japan 2 Use EVMs only after User obtains the license of Test Radio Station as provided in R...

Страница 23: ... any interfaces electronic and or mechanical between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard User assumes all responsibility and liability for any improper or unsafe handling or use of the EVM by User or its employees affiliates contractors or designees 4 4 User assumes all...

Страница 24: ...OR DAMAGES ARE CLAIMED THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT 9 Return Policy Except as otherwise provided TI does not offer any refunds returns or exchanges Furthermore no return of EVM s will be accepted if the package has been opened and no return of the EVM s will be accepted if they are damaged or otherwise not in a resalable condition If User feels it has...

Страница 25: ...s are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for and you wi...

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