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PCB Layout

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SNAU114D – March 2006 – Revised June 2016

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Copyright © 2006–2016, Texas Instruments Incorporated

Using the LMX2485E & LMX2487E Evaluation Board

5

PCB Layout

Figure 8. Layer #1 – Top

Figure 9. Layer #2 – RF Ground Plane

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Содержание LMX2485E-EVM

Страница 1: ...E EVM helps designers evaluate the operation and performance of any of the devices in the LMX248x family Although only two options are offered the other members in the family are all pinout compatible and program compatible to one of these existing board option They would be expected to have similar performance just different in the maximum frequency of operation Topic Page 1 Setup 2 2 Schematic 7...

Страница 2: ...evice and Package Configurations Board Version Designator IC Package VCO Model VCO Frequency Range LMX2485E EVM U1 LMX2485E QFN24 Crystek CVCO55CL 60 80 MHz Crystem CVCO55BE 1800 2200 1800 2200 MHz LMX2487E EVM U1 LMX2487E QFN24 Crystek CVCO44BH 4100 4300 MHz Although the devices are very broadband the VCO is ultimately what limits the frequency range of the evaluation board These VCOs were chosen...

Страница 3: ...e board has DC blocking capacitors so the signal is AC coupled uWire Hook this to the programming interface 1 1 Quick Start for EVM Communications Codeloader is the software used to communicate with the EVM Please download the latest version from TI com http www ti com tool codeloader This EVM can be controlled through the uWire interface on board There are two options in communicating with the uW...

Страница 4: ...1 H1 SYNC pin 7 LMK02000 A0 C1 E5 F1 G1 H1 SYNC pin 7 LMK0480x A0 B2 C3 E5 F0 G0 H1 Status_CLKin1 pin 3 LMK04816 4906 A0 B2 C3 E5 F0 G0 H1 Status_CLKin1 pin 3 LMK01801 A0 B4 C5 E2 F0 G0 H1 Test pin 3 SYNC0 pin 10 LMK0482x prelease A0 B5 C3 D 2 E4 F0 G0 H1 CLKin1_SEL pin 6 Reset pin 10 LMX2531 A0 E5 F2 G1 H2 Trigger pin 1 LMX2485 7 A0 C1 E5 F2 G1 H0 ENOSC pin 7 CE pin 10 LMK03200 A0 E5 F0 G0 H1 SYN...

Страница 5: ... 8 MHz V 100 MHz V VCO Input Capacitance 330 pF 10 pF Nominal Output Frequency 60 to 80 MHz 4100 to 4300 MHz Phase Margin 44º 50º Loop Bandwidth 8 7 kHz 15 kHz Reference Clock Frequency 50 MHz 100 MHz Kφ Charge Pump 16X 1520 μA 8X 760 μA Phase Detector Freq 2000 kHz 20000 kHz PLL Supply 3 3 V from LDO 3 3 V from LDO VCO Supply 5 V 5 V C1 10 nF 5 6 nF C2 680 nF 120 nF C3 15 nF 220 pF C4 1 nF 1 nF R...

Страница 6: ...loader Click on the download button to download the software Run the executable file Figure 5 Using the EVM Software On the Port Setup tab the user may select the type of communication port USB or Parallel that will be used to program the device on the evaluation board If parallel port is selected the user should ensure that the correct port address is entered Don t forget to press Ctrl L or do Ke...

Страница 7: ...sed June 2016 Submit Documentation Feedback Copyright 2006 2016 Texas Instruments Incorporated Using the LMX2485E LMX2487E Evaluation Board 2 Schematic Figure 6 LMX2485E 87E EVM Schematic View Section 3 Bill of Materials for actual component values ...

Страница 8: ...CO Connector SMT End launch SMA 50 ohm Emerson Network Power 142 0701 851 3 8 R3 R20 R21 R23 R55 RES 0 ohm 5 0 1W 0603 Vishay Dale CRCW06030000Z0EA 5 9 R1 R2 R4 R6 R7 R9 R10 R12 R56 RES 10 0 ohm 1 0 1W 0603 Vishay Dale CRCW060310R0FKEA 9 10 R27 R29 R31 RES 18 ohm 5 0 1W 0603 Vishay Dale CRCW060318R0JNEA 3 11 R14 RES 51 ohm 5 0 1W 0603 Vishay Dale CRCW060351R0JNEA 1 12 R24 C21 RES 10k ohm 5 0 1W 06...

Страница 9: ...R 0603 Kemet C0603C153K1RACTU 1 28 C4_RF CAP CERM 1000pF 50V 5 C0G NP0 0603 Kemet C0603C102J5GAC 1 29 R2_RF RES 180 ohm 5 0 1W 0603 Vishay Dale CRCW0603180RJNEA 1 30 R3_RF RES 220 ohm 5 0 1W 0603 Vishay Dale CRCW0603220RJNEA 1 31 R4_RF RES 3 3k ohm 5 0 1W 0603 Vishay Dale CRCW06033K30JNEA 1 Table 7 Additional LMX2487E EVM Specific Componenents Item Designator Description Manufacturer Part Number Q...

Страница 10: ... Submit Documentation Feedback Copyright 2006 2016 Texas Instruments Incorporated Using the LMX2485E LMX2487E Evaluation Board 4 PCB Layers Stackup 6 layer PCB Stackup includes Top Layer for high priority high frequency signals 2 oz FR4 Dielectric 10 mils RF Ground plane 1 oz FR4 23 mils Power plane 1 1 oz FR4 23 mils Bottom Layer copper clad for thermal relief 2 oz Figure 7 PCB Layers ...

Страница 11: ...AU114D March 2006 Revised June 2016 Submit Documentation Feedback Copyright 2006 2016 Texas Instruments Incorporated Using the LMX2485E LMX2487E Evaluation Board 5 PCB Layout Figure 8 Layer 1 Top Figure 9 Layer 2 RF Ground Plane ...

Страница 12: ... 12 SNAU114D March 2006 Revised June 2016 Submit Documentation Feedback Copyright 2006 2016 Texas Instruments Incorporated Using the LMX2485E LMX2487E Evaluation Board Figure 10 Layer 3 Power Figure 11 Layer 3 Bottom Layer ...

Страница 13: ... CP Gain 16x FM 2 Dithering Disabled www ti com Typical Phase Noise Performance Plots 13 SNAU114D March 2006 Revised June 2016 Submit Documentation Feedback Copyright 2006 2016 Texas Instruments Incorporated Using the LMX2485E LMX2487E Evaluation Board 6 Typical Phase Noise Performance Plots LMX2485E Phase Noise Plots Figure 12 Impact of CPG on Phase Noise ...

Страница 14: ... 70 1 MHz CP gain 16x FM 3 Dithering Disabled 70 1 MHz CP gain 16x FM 4 Dithering Disabled Typical Phase Noise Performance Plots www ti com 14 SNAU114D March 2006 Revised June 2016 Submit Documentation Feedback Copyright 2006 2016 Texas Instruments Incorporated Using the LMX2485E LMX2487E Evaluation Board Figure 13 LMX2485E Impact of Fractional Modulator Order ...

Страница 15: ...70 1 MHz CP gain 16x FM 3 Weak Dithering 70 1 MHz CP gain 16x FM 3 Strong Dithering www ti com Typical Phase Noise Performance Plots 15 SNAU114D March 2006 Revised June 2016 Submit Documentation Feedback Copyright 2006 2016 Texas Instruments Incorporated Using the LMX2485E LMX2487E Evaluation Board Figure 14 LMK2485E Impact of Dithering ...

Страница 16: ...thering Disabled 4200 1 MHz CP gain 16x FM 2 DitheringDisabled Typical Phase Noise Performance Plots www ti com 16 SNAU114D March 2006 Revised June 2016 Submit Documentation Feedback Copyright 2006 2016 Texas Instruments Incorporated Using the LMX2485E LMX2487E Evaluation Board Figure 15 LMX2487E Impact of CPG on Phase Noise ...

Страница 17: ...MHz CP gain 8x FM 3 Dithering Disabled 4200 1 MHz CP gain 8x FM 4 Dithering Disabled www ti com Typical Phase Noise Performance Plots 17 SNAU114D March 2006 Revised June 2016 Submit Documentation Feedback Copyright 2006 2016 Texas Instruments Incorporated Using the LMX2485E LMX2487E Evaluation Board Figure 16 LMX2487E Impact on Fractional Modulator ...

Страница 18: ...d 4200 1MHz CP gain 8x FM 2 Weak Dithering 4200 1MHz CP gain 8x FM 2 Strong Dithering Typical Phase Noise Performance Plots www ti com 18 SNAU114D March 2006 Revised June 2016 Submit Documentation Feedback Copyright 2006 2016 Texas Instruments Incorporated Using the LMX2485E LMX2487E Evaluation Board Figure 17 LMX2487E Impact of Dithering ...

Страница 19: ...bers in the current version Changes from C Revision May 2015 to D Revision Page Added Quick start for EVM Communications section 3 Added units to table 4 5 Changed Figure 5 Using the EVM Software 6 Changed Schematic 7 Changed BOM 8 Changes from A Revision July 2013 to B Revision Page Added warning that the LMX2485E EVM has 2 suppliers for VCOs 2 Changes from Original December 2009 to A Revision Pa...

Страница 20: ...ring the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty If TI elects to repair or replace such EVM TI shall have a reasonable time to repair such EVM or provide replacements Repaired EVMs shall be warranted for the remainder of the original warranty period Replaced EVMs shall be warranted for a new full ninety 90 day warranty period 3 ...

Страница 21: ... by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this list having a gain greater than the maximum gain indicated for that type are strictly prohibited for use with this device Concernant les EVMs avec antennes détachables Conformément à la rég...

Страница 22: ... connecting any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation even with the inputs and outputs kept within the specified allowable ranges some circuit components may have elevated case temperatures These components include but are not limited to linear regulators switching transistors pass transistors cu...

Страница 23: ...F REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF USE LOSS OF DATA OR BUSINESS INTERRUPTION NO CLAIM SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN ONE YEAR AFTER THE RELATED CAUSE OF ACTION HAS OCCURRED 8 2 Specific Limitations IN NO EVENT SHALL T...

Страница 24: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

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