LMX2571EVM User's Guide User's Guide Literature Number: SNAU176 January 2015 User's Guide SNAU176 - January 2015 LMX2571EVM User's Guide The Texas Instruments LMX2571EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMX2571 Wideband Frequency Synthesizer. The EVM contains one Frequency Synthesizer. Device: U1 IC: LMX2571 Package: QFN36 Topic 1 2 3 4 5 6 2 ........................................................................................................................... Page Setup.................................................................................................................. 3 Using the EVM Software ....................................................................................... 6 Board Construction .............................................................................................. 9 PCB Layers ....................................................................................................... 12 Measured Performance Data ................................................................................ 17 Bill of Materials .................................................................................................. 25 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Setup www.ti.com 1 Setup 1.1 Input and Output Connector Description Figure 1. Evaluation Board Setup Table 1. Inputs and Outputs Output Name(s) Input/Output Required? Function RFoutRx RFoutRx Output Required One of these outputs needs to be attached to phase noise measurement equiptment, like the Agilent E5052. The unused output need not be connected. Vcc3p3 Input Required Connect to a 3.3 V Power Supply. Ensure the current limit is set above 100 mA. Vcc5V Vcc5VTV_TB Input Optional Instead of using the Vcc3p3 connector, one can connect 5V to one of these outputs and it is regulated down to 3.3V on the board. Programming Interface Input Required Connect the board to a PC using the USB2ANY (HPA665-001) interface provided in kit. OSCin Input Optional The on-board 20 MHz XO has been enabled. To use this input, the XO power supply resistor (R1) should be removed and resistor R3 moved to position R2. SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 3 Setup 1.2 www.ti.com Installing the EVM Software Go to http://www.ti.com/tool/codeloader and download and run the most current software. 1.3 Loop Filter Values and Configuration Information Table 2. Loop Filter values and Configuration Category Configuration VCO Gain Loop Filter Components Loop Filter Characteristics (Assuming Fvco=4.8 GHz, Kvco=56 MHz/V) 1.4 Parameter Value OSCin Frequency (MHz) 20 MHz Phase Detector Frequency (MHz) 80 MHz VCO Frequency 4300 to 5400 MHz Charge Pump Gain 1x 1240 A VCO_L 46 to 61 MHz/V VCO_M 50 to 65 MHz/V VCO_H 55 to 73 MHz/V C1_LF 390 pF C2_LF 4.7 nF C3_LF (Internal) 50 pF C4_LF (Internal) 50 pF R2_LF 680 R3_LF (Internal) 800 R4_LF (Internal) 800 Loop Bandwidth 234 kHz Phase Margin 43.7 Readback Notification Although the LMX2571 does support readback, there are some issues with the CodeLoader software and board to do this. In order to readback, this needs to be done with external software. As a means of debugging, consider using the power down feature and monitoring the changes in the current consumption. 1.5 Lock Detect Notification The lock detect on the LMX2571 works perfectly well. However, the LED decides to light when it feels like it. Pressing on the LED with one's fingernail can sometimes get it to work better. The key takeaway from this is the green LED is not reliable for lock detect. If it is on, it indicates lock, but if it is off, it indicates unlock or an issue with the LED diode. 1.6 Pin 8 Component Notification Note that Pin 8 has a capacitor to ground, but it was found that this component provided no benefit, although it does no harm either. 4 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Setup www.ti.com 1.7 Crystal Oscillator Noise Notification The following plot shows the XO noise compared to a much cleaner reference. The XO is included for quick startup and evaluation, but can be bypassed or changed. The criteria for choosing the XO was availability and standard footprint, which took priority over phase noise and stability. Sometimes if the XO is burn in by letting the board run for a few hours, the phase noise and stability will improve. Optimal phase noise is obtained with a clean input signal. Figure 2. Impact of XO Noise SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 5 Using the EVM Software www.ti.com 2 Using the EVM Software 2.1 Main Setup and Default Mode Choose the default startup mode on the main tab as shown. After the default mode is loaded, don't forget to load the device with Ctrl+L or with Keyboard Controls -> Load Device. Figure 3. Loading Default Mode for the Main Configuration Screen 6 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Using the EVM Software www.ti.com 2.2 Port Setup 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. CodeLoader does NOT auto detect the correct settings for this. The identify function verifies that the computer is communicating wit the USB2ANY board, but does NOT verify that the USB2ANY board is communicating with the device. Figure 4. Port Setup Tab SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 7 Using the EVM Software 2.3 www.ti.com Bits/Pins Settings To view the function of any bit on the CodeLoader configuration tabs, place the cursor over the desired bit register label and click the right mouse button on it for a description. Figure 5. Bits/Pins Tab 8 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Board Construction www.ti.com 3 Board Construction 3.1 Board Layer Stack Up The board is made on FR4 for the Prepreg and Core Layers. The top layer is 1 oz copper. Total Height (60.8mil) Prepreg (16mil) Top Layer Core (22mil) GND Prepreg (16mil) Power Bottom Layer Figure 6. Board Layer Stack Up FR4 material was chosen because of convenience, availability, and cost. SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 9 Board Construction 3.2 www.ti.com Schematic Figure 7. LMX2571 Schematic 10 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Board Construction www.ti.com SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 11 PCB Layers 4 www.ti.com PCB Layers Figure 8 shows the assembly diagram that indicates where the components are placed. Figure 8. Top Assembly Layer 12 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated PCB Layers www.ti.com In the Top Layer, Figure 9, the ground plane is pulled far away from the signal traces to minimize the potential of spur energy coupling onto them. This board can be assembled with all components on the top layer. Figure 9. Top Layer SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 13 PCB Layers www.ti.com On the Ground Layer, Figure 10, notice that there is a separate ground plane below the OSCin signal. This is to prevent the OSCin signal coupling to the other ground plane. They are connected by a resistor on the top layer. Figure 10. Ground Layer 14 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated PCB Layers www.ti.com The power layer, Figure 11, effort is made to avoid putting any plane below the OSCin signal ground, to minimize the potential of spur coupling. The upper right plaine is the 5V plane and the lower left is the 3.3V pPlane. Figure 11. Power Layer SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 15 PCB Layers www.ti.com The Bottom Layer, Figure 12, is used to route less critical functions. Figure 12. Bottom Layer 16 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Measured Performance Data www.ti.com 5 Measured Performance Data 5.1 Phase Noise in Default Mode Figure 13 shows the phase noise in default mode. Figure 13. Phase Noise (Default Mode) SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 17 Measured Performance Data www.ti.com Figure 14 shows the phase noise in default mode as well. The dim trace is the default mode (Fpd=80MHz) and the bright trace has Fpd=20 MHz and 4 times the charge pump current (to keep the same bandwidth). We see that the results are similar. Figure 14. Default Mode vs. Fpd = 20 MHz and 4x Higher Charge Pump Gain 18 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Measured Performance Data www.ti.com Figure 15 Shows the impact of taking a 4800 MHz VCO signal and dividing with the pre divider values of 4,5,6, and 7. We see a textbook 20*log relationship for phase noise. about -155 dBc/Hz. The second plot shows when the secondary channel divider is used. Close in, we see the 20*log relationship, but eventually, this hits a noise floor. Figure 15. Phase Noise (Default Mode) Figure 16. Noise Floor with CHDIV2 SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 19 Measured Performance Data 5.2 5.2.1 www.ti.com VCO Phase Noise Fvco = 4400 MHz / 4 Figure 17 shows the phase noise of just the VCO at 4400 MHz and divided by 4. To take this measurement, the charge pump was set to tri-state and this is why the frequency is off. Figure 17. VCO Phase Noise Fvco = 4800 MHz/4 20 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Measured Performance Data www.ti.com 5.2.2 Fvco = 4800 MHz/4 Figure 18 shows the phase noise of just the VCO at 4800 MHz and divided by 4. To take this measurement, the charge pump was set to tri-state and this is why the frequency is off. Figure 18. VCO Phase Noise Fvco = 4800 MHz/4 SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 21 Measured Performance Data 5.2.3 www.ti.com Fvco = 5200 MHz/4 Figure 19shows the phase noise of just the VCO at 5200 MHz and divided by 4. To take this measurement, the charge pump was set to tri-state and this is why the frequency is off. Figure 19. VCO Phase Noise Fvco = 5200 MHz/4 22 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Measured Performance Data www.ti.com 5.3 Fractional Spurs and Spur-b-Gone This plot is for a VCO frequency of 4881 MHz, which is very close to the integer boundary of 4880 MHz. Note the 1 MHz spur and also we see 1 MHz/4 = 250 kHz from the output divider Figure 20. No Spur-b-Gone Fvco = 4881 MHz/10, Fpd = 80 MHz After using Spur-B-Gone, the phase detector changes from 80 to 110 MHz and we see that the spurs are substantially reduced. SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 23 Measured Performance Data www.ti.com Figure 21. With Spur-b-Gone: Fvco = 4881 MHz/10, Fpd = 110 MHz 24 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Bill of Materials www.ti.com 6 Bill of Materials Table 3. LMX2571 Bill of Materials Ite m Designator Description PartNumber Qua ntity 1 C1, C20, C24, C25, C26, C33 CAP, CERM, 1 F, 16 V, +/- 10%, X7R, 0603 Y MuRata GRM188R71C105 KA12D 6 2 C1LFA CAP, CERM, 390pF, 50V, +/-5%, C0G/NP0, 0603 Y AVX 06035A391JAT2A 1 3 C2, C3, C4, C5, C6, C7, C14, C16, C19, C21, C22, C23, C29, C31 CAP, CERM, 0.1uF, 16V, +/-5%, X7R, 0603 Y AVX 0603YC104JAT2A 14 4 C2LFA CAP, CERM, 4700pF, 100V, +/-5%, X7R, 0603 Y AVX 06031C472JAT2A 1 5 C12, C13 CAP, CERM, 100pF, 50V, +/-5%, C0G/NP0, 0603 Y Kemet C0603C101J5GAC TU 2 6 C15 CAP, CERM, 2.2uF, 10V, +/-10%, X5R, 0603 Y Kemet C0603C225K8PAC TU 1 7 C17, C18 CAP, CERM, 1000pF, 100V, +/-5%, X7R, 0603 Y AVX 06031C102JAT2A 2 8 C27 CAP, CERM, 0.01uF, 50V, +/-10%, X5R, 0603 Y MuRata GRM188R61H103 KA01D 1 9 C28, C30, C32 CAP, CERM, 10 F, 25 V, +/- 20%, X5R, 0603 Y MuRata GRM188R61E106 MA73 3 10 D1 LED, Green, SMD Y Lumex SML-LX2832GCTR 1 11 Fin, OSCin, RFoutRx, RFoutTx, Vcc3p3 Connector, End launch SMA, 50 ohm, SMT Y Emerson Network Power 142-0701-851 5 12 R1, R30 RES, 10 ohm, 5%, 0.1W, 0603 Y VishayDale CRCW060310R0J NEA 2 13 R2LFA RES, 680 ohm, 5%, 0.1W, 0603 Y VishayDale CRCW0603680RJ NEA 1 14 R3, R8, R9, R10, R11, R13, R14, R21, R22, R26, R27, R28, R29, R32, R33, R35, R40, R41, R46, R52, R53 RES, 0 ohm, 5%, 0.1W, 0603 Y VishayDale CRCW06030000Z0 EA 21 15 R12 RES, 330 ohm, 5%, 0.1W, 0603 Y Yageo America RC0603JR07330RL 1 16 R15, R17, R18, R20 RES, 330 ohm, 1%, 0.1W, 0603 Y Yageo America RC0603FR07330RL 4 17 R16, R19, R23, R24, R25 RES, 18 ohm, 5%, 0.1W, 0603 Y VishayDale CRCW060318R0J NEA 5 18 R36 RES, 41.2 k, 1%, 0.1 W, 0603 Y VishayDale CRCW060341K2F KEA 1 19 R37 RES, 13k ohm, 5%, 0.1W, 0603 Y VishayDale CRCW060313K0J NEA 1 20 R42, R44, R48, R50, R55 RES, 10k ohm, 5%, 0.1W, 0603 Y VishayDale CRCW060310K0J NEA 5 21 R43, R45, R47, R54 RES, 12k ohm, 5%, 0.1W, 0603 Y VishayDale CRCW060312K0J NEA 4 22 S1, S2, S3, S4 HEX STANDOFF SPACER, 9.53 mm Y Richco Plastics TCBS-6-01 4 23 U1 Low Power Synthesizer with FSK Modulation, RHH0036C Texas Instrument s LMX2571RHHR 1 24 U3 Ultra Low Noise, 150mA Linear Regulator for RF/Analog Circuits Requires No Bypass Capacitor, 6-pin LLP, Pb-Free National Semicondu ctor LP5900SD3.3/NOPB 1 SNAU176 - January 2015 Submit Documentation Feedback RoH Manufactu S rer Y LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 25 Bill of Materials www.ti.com Table 3. LMX2571 Bill of Materials (continued) 26 25 U4 Ultra Low Noise, 800 mA Linear Voltage Regulator for RF/Analog Circuits, DNT0012B Y Texas Instrument s LP38798SDADJ/NOPB 1 26 U5 0.75-O DUAL SPST ANALOG SWITCH WITH 1.8-V COMPATIBLE INPUT LOGIC, DCU0008A Y Texas Instrument s TS5A21366DCUR 1 27 uWire Header (shrouded), 100mil, 5x2, Gold plated, SMD Y FCI 52601-S10-8LF 1 28 Vcc5V_TB Terminal Block, 10.76x17x11 mm, 2POS, 26-12AWG, TH Y Weidmuller 1592820000 1 29 Y1 Oscillator, 20MHz, 3.3 V, SMD Y ConnorWinfield CWX813-020.0M 1 30 C1LFB CAP, CERM, 0.47uF, 16V, +/-10%, X7R, 0603 Y Kemet C0603C474K4RAC TU 0 31 C2ALFB, C2BLFB, C2LFB CAP, CERM, 4.7uF, 16V, +/-10%, X5R, 0603 Y MuRata GRM188R61C475 KAAJ 0 32 C3LFB, C4LFB CAP, CERM, 0.039uF, 100V, +/-10%, X7R, 0603 Y Kemet C0603C393K1RAC TU 0 33 C8, C9 CAP, CERM, 100pF, 50V, +/-5%, C0G/NP0, 0603 Y Kemet C0603C101J5GAC TU 0 34 C10, C11 CAP, CERM, 1000pF, 100V, +/-5%, X7R, 0603 Y AVX 06031C102JAT2A 0 35 C34 CAP, CERM, 0.1uF, 16V, +/-5%, X7R, 0603 Y AVX 0603YC104JAT2A 0 142-0701-851 0 36 ExtFSKin, OSCin*, Vcc5V Connector, End launch SMA, 50 ohm, SMT Y Emerson Network Power 37 FSK Header (shrouded), 100mil, 5x2, Gold plated, SMD Y FCI 52601-S10-8LF 0 38 L1, L2 Inductor, Ferrite, 1uH, 0.7A, 0.15 ohm, SMD Y MuRata LQM18PN1R0MFH 0 39 R2, R5, R6, R7, R31, R34, R38, R39, R56, R59, R60, R61, R62 RES, 0 ohm, 5%, 0.1W, 0603 Y VishayDale CRCW06030000Z0 EA 0 40 R2LFB, R3LFB, R4LFB RES, 10 ohm, 5%, 0.1W, 0603 Y VishayDale CRCW060310R0J NEA 0 41 R4 RES, 51.0 ohm, 1%, 0.1W, 0603 Y Yageo America RC0603FR0751RL 0 42 R24b RES, 68 ohm, 5%, 0.1W, 0603 Y VishayDale CRCW060368R0J NEA 0 43 R49 RES, 10k ohm, 5%, 0.1W, 0603 Y VishayDale CRCW060310K0J NEA 0 44 R51 RES, 12k ohm, 5%, 0.1W, 0603 Y VishayDale CRCW060312K0J NEA 0 45 R57, R58 RES, 1.0k ohm, 5%, 0.1W, 0603 Y VishayDale CRCW06031K00J NEA 0 46 U2 VCO, 1800-2200MHz, SMD Y Crystek Corporatio n CVCO55BE-18002200 0 47 Vcc3p3_TB Terminal Block, 10.76x17x11 mm, 2POS, 26-12AWG, TH Y Weidmuller 1592820000 0 48 Y1x Crystal, 10.000MHz, 10pF, SMD Y TXC Corporatio n 7B-10.000MEEQ-T 0 LMX2571EVM User's Guide SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated Bill of Materials www.ti.com SNAU176 - January 2015 Submit Documentation Feedback LMX2571EVM User's Guide Copyright (c) 2015, Texas Instruments Incorporated 27 Revision History www.ti.com Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. This Revision History highlights the technical changes made to this document SNAU136 Revisions SEE SNAU136 28 ADDITIONS/MODIFICATIONS/DELETIONS General Comments: Initial Document Revision Revision History SNAU176 - January 2015 Submit Documentation Feedback Copyright (c) 2015, Texas Instruments Incorporated IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as "components") are sold subject to TI's terms and conditions of sale supplied at the time of order acknowledgment. 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