Texas Instruments LMX2595EVM User Manual Download Page 26 | Manualshive

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Appendix G

26

SNAU219 – June 2017

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Copyright © 2017, Texas Instruments Incorporated

SYSREF Feature

Figure 24. Check SysRefReq Box on User Controls Tab

6. To modify SysRef Frequency, change the value in the

SYSREF_DIV

box

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Summary of Contents for LMX2595EVM

Page 1: ... 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 i...

Page 2: ...Incorporated LMX2595 EVM Instructions 19 GHz Wideband Low Noise PLL With Integrated VCO Appendix H VCO Calibration 28 Appendix I Enabling Onboard DC DC Buck Converter TPS62150 30 Appendix J Appendix J Using the VCO Doubler 31 Trademarks All trademarks are the property of their respective owners ...

Page 3: ...th 600 mA current limit and connect to VCC SMA 2 Input Signal a VC 708 100 MHz on board oscillator enabled default To use another reference see Appendix D 3 Programming Interface Reference Pro will provide SPI interface to program LMX2595 a Connect USB cable from laptop or PC to USB port in Reference Pro This provides power to Reference Pro Board and communication with TICS GUI b Connect 10 pin ri...

Page 4: ... ti com 4 SNAU219 June 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated LMX2595 EVM Instructions 19 GHz Wideband Low Noise PLL With Integrated VCO 2 EVM Description The LMX2595 is populated on a 4 layer PCB This brief description should help you use the EVM Figure 3 LMX2595EVM Description The serial interface pin description is as follow Table 1 EVM and Serial Inter...

Page 5: ...9 June 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated LMX2595 EVM Instructions 19 GHz Wideband Low Noise PLL With Integrated VCO The LD switch must be on to enable Lock indicator Figure 4 LD Lock Detect ...

Page 6: ...ing the Software 1 Download TICS Pro from the TI Website at www ti com tool TICSPRO SW 2 Install it by following the wizard 3 Search for LMX2595 Click on Select Device From menu bar PLL VCO LMX2595 Figure 5 Search for LMX2595 on TICS Pro 4 You are now ready to use this software Verify that you can communicate with Reference Pro Select interface under USB communications Figure 6 USB Communications ...

Page 7: ...dback Copyright 2017 Texas Instruments Incorporated LMX2595 EVM Instructions 19 GHz Wideband Low Noise PLL With Integrated VCO 5 Click on identify and you will see the LED MSP430 Supplied Blink on Reference Pro Figure 7 USB Communication Between TICS Pro and Reference Pro ...

Page 8: ...ation Feedback Copyright 2017 Texas Instruments Incorporated LMX2595 EVM Instructions 19 GHz Wideband Low Noise PLL With Integrated VCO 3 Bringing LMX2595 to a Lock State Load the default mode by selecting it as shown in Figure 8 Figure 8 TICS Pro GUI LMX2595 Default Configuration ...

Page 9: ... Texas Instruments Incorporated LMX2595 EVM Instructions 19 GHz Wideband Low Noise PLL With Integrated VCO For best results in the User Controls Tab in TICS Pro Under General Controls check and uncheck the Reset box After the reset Write all registers as shown in Figure 9 Figure 9 TICS Pro Write All Registers ...

Page 10: ...Loop Filter Configuration PARAMETER VALUE VCO Gain 132 MHz V Loop Bandwidth 285 kHz Phase Margin 65 deg C1_LF 390 pF C2_LF 68 nF C3_LF Open C4_LF 1800 pF R2 68 Ω R3_LF 0 Ω R4_LF 18 Ω Effective Charge Pump Gain 15 mA Phase Detector Frequency MHz 200 MHz VCO Frequency Designed for 15 GHz but works over the whole frequency range Figure 10 Current Loop Filter Configuration For detailed design and simu...

Page 11: ...d LMX2595 EVM Instructions 19 GHz Wideband Low Noise PLL With Integrated VCO 5 Key Results to Expect Figure 11 Phase Noise Plot at 14 GHz Output Frequency This assumes that the input reference is very clean such as a 100 MHz Wenzel oscillator A signal generator is NOT sufficiently clean The LMX2595 requires an external reference ...

Page 12: ...12 SNAU219 June 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated Schematic Appendix A SNAU219 June 2017 Schematic Figure 12 Schematic ...

Page 13: ...6T 6 C13 C18 C23 C24 C26 C27 C28 C29 CAP CERM 1 µF 16 V 10 X7R 0603 TDK C1608X7R1C105K080AC 8 C19 C20 C21 C22 C25 CAP CERM 10 µF 10 V 20 X5R 0603 TDK C1608X5R1A106M080AC 5 CE_TP CSB_TP GND_TP MUXout_TP RampCLK_TP RampDIR_TP SCK_TP SDI_TP SYNC_TP SysRefReq_TP Vcc_TP VccRF_TP Vtune_TP Test Point Compact White TH Keystone 5007 13 Cin_0 CAP CERM 10 µF 25 V 10 X5R 0805 MuRata GRM219R61E106KA12D 1 Cout0...

Page 14: ... 1 0 1 W 0603 Vishay Dale CRCW0603562KFKEA 1 RFoutAM RFoutAP RFoutBM RFoutBP JACK SMA 50 Ω Gold Edge Mount Johnson 142 0771 831 4 U1 High Performance Wideband PLLatinum RF Synthesizer RHA0040A VQFN 40 Texas Instruments LMX2595RHAR 1 U3 Buck Step Down Regulator with 3 to 17 V Input and 0 9 to 6 V Output 40 to 85 C 16 Pin QFN RGT Green RoHS and no Sb Br Texas Instruments TPS62150RGTR 0 uWire Header ...

Page 15: ...2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated Board Layers Stack Up Appendix C SNAU219 June 2017 Board Layers Stack Up Total Board thickness is 62 mils Figure 13 Board Layer Stack Up ...

Page 16: ...nce Oscillator Requirements 100 MHz REFERENCE MINIMUM REQUIREMENTS FOR A 0 4 dB IMPACT ON PLL INBAND PN 1 Offset Hz 100 1k 10k 100k Noise level dBc Hz 139 149 159 164 There are different options to provide a reference oscillator to LMX2595 Use on board oscillator default Enable LMK61xx from Reference Pro PCB use external oscillator By default the onboard oscillator is enabled To use external refer...

Page 17: ...opyright 2017 Texas Instruments Incorporated Changing Reference Oscillator and Setup For single ended 1 Switch R24b to R24 2 Switch R29b to R29 3 Must remove R33 to remove power from oscillator 4 Populate R25 and R30 5 Remove R32 Figure 15 Differential Reference Configuration ...

Page 18: ...Pro Appendix E SNAU219 June 2017 Connecting Reference Pro 1 To use Reference Pro change the configuration for SE or differential connection as shown on Appendix D 2 Change jumper position on Reference Pro connect middle pin of OE header to Vdd Figure 16 Reference Pro Output Enable Header Figure 17 LMX2595EVM Setup With Reference Pro The LMK61PD0A2 has several control pins dedicated for control of ...

Page 19: ...PUT TYPE X O Disabled PLL Functional 0 1 LVPECL NC 1 LVDS 1 1 HCSL The OS pin is used to bias internal drivers and change the output type It is imperative to match the output termination passive components as shown on Table 7 with the output type from Table 6 Table 7 lists component values for each configuration 1 50 Ω to VCC 2 V termination is required on receiver 2 100 Ω differential termination...

Page 20: ... Instruments Incorporated Connecting Reference Pro Table 7 Output Termination Schemes continued OUTPUT FORMAT COUPLING COMPONENT VALUE HCSL AC R25 R28 0 Ω R26 R29 50 Ω C24 C25 0 Ω R27 R30 R31 DNP DC R25 R28 0 Ω R26 R29 50 Ω C24 C25 0 01 uF R27 R30 R31 DNP Figure 18 LMK61PD0A2 Output Termination ...

Page 21: ...ruments Incorporated Ramping Feature Appendix F SNAU219 June 2017 Ramping Feature F 1 Ramping Example Waveform VCO is ramping from 8 to 10 GHz and being dividing by 4 so that it can be seen with the HP53310A This can be set up on the ramp GUI tab Figure 19 Ramping Example Tics ...

Page 22: ...Ramping Example Waveform www ti com 22 SNAU219 June 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated Ramping Feature Figure 20 Ramping Example ...

Page 23: ...struments Incorporated SYSREF Feature Appendix G SNAU219 June 2017 SYSREF Feature 1 Bring LMX2594 to a Lock State 2 Perform Sync Figure 21 Perform Sync For SysRef 3 Configure TICS Pro PLL tab for SysRef Check the SYSREF_EN box Change OUTB_MUX to SysRef Uncheck the OUT_PD box ...

Page 24: ... Texas Instruments Incorporated SYSREF Feature Figure 22 Configure and Enable SysRef 4 Confirm the Interpolator Frequency is between 800 MHz and 1500 MHz If not change the SYSREF_DIV_PRE drop down to Div2 or Div4 to reach an appropriate Interpolator Frequency for the current configuration ...

Page 25: ... June 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated SYSREF Feature Figure 23 Interpolator Frequency For SysRef 5 Go to User Controls in the side bar and check the SysRefReq box under the Pins section ...

Page 26: ...SNAU219 June 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated SYSREF Feature Figure 24 Check SysRefReq Box on User Controls Tab 6 To modify SysRef Frequency change the value in the SYSREF_DIV box ...

Page 27: ...gh Default mode See quick start instructions Master Pulse LMX2595 generates a finite number of pulses as long as the SysRefReq pin is held high Note SysRefReq must be held high for the duration of the pulses Uncheck SysRefReq under Pins in User Controls tab Check SYSREF_PULSE Set SYSREF_PULSE_CNT to desired number of pulses Check SysRefReq under Pins in User Controls tab Repeater RFOUTB will repea...

Page 28: ...1 6 V 3 Set MUXOUT_SEL register R0 2 to a value of 1 for lock detect 4 Set your desired output frequency to lock to 5 Trigger the calibration with FCAL_EN register R0 3 to a value of 1 6 Observe the triggered pulse there must be a pulse from MUXout digital HIGH to LOW and back to HIGH the low indicates the instant calibration is triggered and running then high is when done calibration Adjust the t...

Page 29: ...www ti com Appendix H 29 SNAU219 June 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated VCO Calibration Figure 27 Unassisted Calibration Plot ...

Page 30: ...219 June 2017 Enabling Onboard DC DC Buck Converter TPS62150 Figure 28 Resistor Configuration to Enable DC DC 1 MUST SWITCH R35 to Rtps1 2 MUST SWITCH R34 to Rtps2 3 Populate Rtps 4 DC DC circuitry was optimized for efficiency for 5 to 8 V but a voltage of 3 3 V to 17 V can be applied to VCC SMA after resistor network is configured correctly from steps above ...

Page 31: ...7 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated Appendix J Using the VCO Doubler Appendix J SNAU219 June 2017 Appendix J Using the VCO Doubler Figure 29 VCO Frequency Doubler Setup in TICSPro ...

Page 32: ...Appendix J www ti com 32 SNAU219 June 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated Appendix J Using the VCO Doubler Figure 30 18 GHz Phase Noise using VCO Doubler ...

Page 33: ...y set forth above or credit User s account for such EVM TI s liability under this warranty shall be limited to EVMs that are returned during 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 warr...

Page 34: ...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 réglementation d Industrie Canada le présent émetteur radio peut fo...

Page 35: ...ed loads Any loads applied outside of the specified output range may also result in unintended and or inaccurate operation and or possible permanent damage to the EVM and or interface electronics Please consult the EVM user guide prior to 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 ...

Page 36: ...COST OF 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 TWELVE 12 MONTHS AFTER THE EVENT THAT GAVE RISE TO THE CAUSE OF ACTION HAS OCCURRED 8 2 Specif...

Page 37: ... TI Resource NO OTHER LICENSE EXPRESS OR IMPLIED BY ESTOPPEL OR OTHERWISE TO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT AND NO LICENSE TO ANY TECHNOLOGY OR INTELLECTUAL PROPERTY RIGHT OF TI OR ANY THIRD PARTY IS GRANTED HEREIN including but not limited to any patent right copyright mask work right or other intellectual property right relating to any combination machine or process in which TI product...

Page 38: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments LMX2595EVM ...

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