Texas Instruments VCO LMX248x Evaluation Board User's Guide Snau137a

8/15/2019 Texas Instruments VCO LMX248x Evaluation Board User's Guide Snau137a

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LMX248x Evaluation Board

User's Guide

Revised – March 2014SNAU137


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2 SNAU137 LMX248x Evaluation Board User’s Guide Revised - March 2014Copyright © 2014, Texas Instruments Incorporated

LMX248xEvaluation Board Operating Instructions

http://www.ti.com/http://www.ti.com/


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Revised - March 2014 LMX248x Evaluation Board User’s Guide SNAU137 3 Copyright © 2014, Texas Instruments Incorporated

Table of Contents

EQUIPMENT ..................................................................................................................................................................................... 4

BASIC OPERATION ........................................................................................................................................................................... 5

LMX2485 BOARD I NFORMATION .................................................................................................................................................... 7

RF PLL PHASE NOISE ..................................................................................................................................................................... 9

RF PLL FRACTIONAL SPURS ......................................................................................................................................................... 11

RF PLL LOCK TIME ...................................................................................................................................................................... 12

IF PLL LOCK TIME ........................................................................................................................................................................ 14

IF PLL PHASE NOISE ..................................................................................................................................................................... 15

IF PLL SPURS ................................................................................................................................................................................ 16

LMX2486 BOARD I NFORMATION .................................................................................................................................................. 17

RF PLL PHASE NOISE ................................................................................................................................................................... 18

RF PLL FRACTIONAL SPURS ......................................................................................................................................................... 20

RF PLL LOCK TIME (WITH A SPECTURM A NALYZER ) .................................................................................................................. 21

IF PLL PHASE NOISE ..................................................................................................................................................................... 22

IF PLL SPURS ................................................................................................................................................................................ 23

IF PLL LOCK TIME ........................................................................................................................................................................ 24

LMX2487 BOARD I NFORMATION .................................................................................................................................................. 25

FINDING A VCO ............................................................................................................................................................................ 25

R EPLACING THE VCO WITH A FOOTPRINT COMPATIBLE VCO ...................................................................................................... 26

APPENDIX A: SCHEMATICS ............................................................................................................................................................ 27

APPENDIX B: BUILD DIAGRAMS .................................................................................................................................................... 28

APPENDIX C: BILL OF MATERIALS ................................................................................................................................................ 31

APPENDIX D: QUICK START FOR EVM COMMUNICATIONS ........................................................................................................... 34



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EquipmentPower Supply

The Power Supply should be a low noise power supply. An Agilent 6623A Triple power supply with LC filters on theoutput to reduce noise was used in creating these evaluation board instructions.

Signal GeneratorThe Signal Generator should be capable of frequencies and power level required for the part. A Rohde & Schwarz SML03was used in creating these evaluation board instructions.

Phase Noise / Spectrum AnalyzerFor measuring phase noise an Agilent E5052A is recommended. An Agilent E4445A PSA Spectrum Analyzer with thePhase Noise option is also usable although the architecture of the E5052A is superior for phase noise measurements. Atfrequencies less than 100 MHz the local oscillator noise of the PSA is too high and measurements will be of the localoscillator, not the device under test.

OscilloscopeThe oscilloscope and probes should be capable of measuring the output frequencies of interest when evaluating thisboard. The Agilent Infiniium DSO81204A was used in creating these evaluation board instructions.



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Basic Operation

1. Connect the signal generator output to the OSCin input of the board. For this example we use a 10 MHz sinsignal at +5dBm power level.

2. Connect a low noise 3.3 V power supply to the Vcc connector located at the top left of the board.

3. Please see Appendix D for quick start on interfacing the board. Connect PC to the uWire header.

4. Start CodeLoader4.exe.

5. Click “Select Device” “PLL-Fractional” LMX248x depending on which chip is on your board.



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6. Select USB or LPT Communication Mode on the Port Setup tab as appropriate.

7. Click “CTRL + L” to load settings into device



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LMX2485 Board Information

The LMX2485 Evaluation Board simplifies evaluation of the LMX2485 2.6 GHz/0.8 GHz PLLatinumTM

dual frequencysynthesizer . The board enables all performance measurements with no additional support circuitry. The evaluationboard consists of a LMX2485 device, a RF VCO module and IF VCO & RF/IF loop filters built by discrete components.The SMA flange mount connectors are provided for external reference input, RF and IF VCO outputs, and the power andgrounding connection. A cable assembly is bundled with the evaluation board for connecting to a PC through the parallelprinter port. By means of USB2ANY-uWire serial port emulation, the CodeLoader software included can be run on a PCto facilitate the LMX2485 internal register programming for the evaluation and measurement.

RF LOOP FILTER Theoretical ( NOT Measured ) Simulation

(Done with EasyPLL at http ://www.ti.com/lsds/ti/wireless)

Phase Margin 48.3 degPole Ratio

T3 /T140.2 %

Loop Bandwidth 11.3 KHzPole Ratio

T4/T336.3 %

Lock Time2400 – 2480 MHz to 1

KHz tolerance in247 uS w/o Fastlock

Spur Gain@ 200 KHz

-45.8 dB

VCO

CPoRF

2.7 nF

47 nF

820270 pF 180 pF

3.9 K 5.6 K

Settings for Operation

Kφ 400 uA

ComparisonFrequency

10 MHz

OutputFrequency

2400 – 2480MHz

PLL Supply 2.5 Volts

VCO Supply 3 Volts

Other Information

VCO Used VARIL2450UVCO Gain 55 MHz/Volt

VCO InputCapacitance

22 pF



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IF LOOP FILTER

Theoretical ( NOT Measured ) Simulation ( Done wi th EasyPLL at www.ti.com )

Phase Margin 47.1 deg Lock Time

760 - 780 MHz

MHz to 1 KHztolerance in 453uS

Loop Bandwidth 5.1 KHzSpur Gain

@ 200 KHz22.1 dB

VCO

CPoRF

1.8 nF

10 nF

8.2 K

Open Open

0 0


Kφ 4 mA

ComparisonFrequency

50 kHz

OutputFrequency

760 - 780 MHz

PLL Supply 2.5 Volts

VCO Supply 3 Volts

Other Information

VCO Used VARIL191-773UVCO Gain 18 MHz/Volt

VCO InputCapacitance

100 pF



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RF PLL Phase Noise

Loop Bandwidth is about 10 kHz. Note that the phase noise gradually improves as one goes fartherfrom the carrier. Also note that this is done with 200 uA of current, and the true phase noisecapability of the part is not shown here because the phase noise is worse, and the VCO phasenoise could still be degrading the in-band phase noise.



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For this plot, the charge pump was increased to 1600 uA. This improves the PLL phase noise performance andalso increases the loop bandwidth so the true PLL performance can be seen. The reason that the original loopfilter was not designed for 1600 uA current was that it makes the loop filter capacitors 8X larger and also, thelower current allows one to experiment with lower comparison frequencies like 2.5 MHz, 5 MHz, and 10 MHz.



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RF PLL Fractional Spurs

At 2400.2 MHz output frequency, theprimary fractional spur at 200 kHz is

-70.7 dBc, and the sub-fractional spur at100 kHz is -69.5 dBc.







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RF PLL Lock Time

N o C

S R C .

R F_

T O C = 0

Peak time without cycle slipreduction is 1110 uS.

Peak time without cycle slipreduction is 1622 uS.

Positive lock time is 1220 uS

Negative Lock time is 1711 uS



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RF PLL Lock Time

C y c l e S l i p R e d u

c t i o n E n a b l e d .

R F_

T O C = 5 0 0

Peak time with cycle slip reductionis 222 uS.

Peak time with cycle slip reductionis 222 uS.

Positive lock time is 345 uS

Negative Lock time is 378 uS



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IF PLL Lock Time

Peak time is 97.8 uS

Peak Time is 133.3 uS

Positive Lock time is 510 uS

Negative Lock Time is 474 uS



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IF PLL Phase Noise



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IF PLL Spurs

Spurs at 50 kHz offset for an output frequency of760 MHz are -97.5 dBc.

Note the cusping effect at 50 kHz. This is becausethe loop bandwidth is wide relative to thecomparison frequency. This is due to the discretesampling action of the phase detector.





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Revised – March 2014 LMX248x Evaluation Board User’s Guide SNAU137 17 Copyright © 2014, Texas Instruments Incorporated


The LMX2486 Evaluation Board simplifies evaluation of the LMX2486 4.5 GHz/3.0 GHz PLLatinumTM

dual frequencysynthesizer . The board enables all performance measurements with no additional support circuitry. The evaluationboard consists of a LMX2486 device, a RF VCO module and IF VCO & RF/IF loop filters built by discrete components.

The SMA flange mount connectors are provided for external reference input, RF and IF VCO outputs, and the power andgrounding connection. A cable assembly is bundled with the evaluation board for connecting to a PC through the parallelprinter port. By means of USB2ANY-uWire serial port emulation, the CodeLoader software included can be run on a PCto facilitate the LMX2486 internal register programming for the evaluation and measurement.

RF Loop FilterPhase Mar in 46.5 de Pole Ratio T3 4.5 %

Loop Bandwidth 9.8 KHz Pole Ratio 57.7 %

Theoretical DiscreteLock Time

915 uS w/o CSR to 1kHz

Roll-Off200 KHz

-42.7 dB

VCO

CPoRF

6.8 nF

220 nF

1504.7 nF 15 nF

56 33


K φ 8X (760 uA)ComparisonFrequency

20 MHz

Output

Frequency

3200 – 3300

MHz

PLL Supply3.3 Volts from

regulator

VCO Supply 5.5 Volts

VCO Information

VCO Used VARIL690-

KVCO 90 MHz/Volt

InputCapacitance

22 pF

IF Loop Filter

Phase Margin 48.1 degTheoretical

Discrete Lock

Time

160 uS to 1 kHz

Loop Bandwidth 16.8 KHzSpur Gain

@ 50 KHz50.5 dB

VCO

CPoRF

680 pF

4.7 nF

4.7 K

Open

0


K φ 3.5 mA

ComparisonFrequency

200 kHz

Output

Frequency

2100 - 2200

MHz

PLL Supply3.3 Volts from

regulator

VCO Supply 5.5 volts

VCO Information

http://www.ti.com/http://www.ti.com/http://www.ti.com/


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18 SNAU137 LMX248x Evaluation Board User’s Guide Revised – March 2014Copyright © 2014, Texas Instruments Incorporated

VCO Used VARIL190-

KVCO 80 MHz/Volt

Input

Capacitance120 pF

RF PLL Phase Noise

Loop Bandwidth is about 10 kHz. Note that the phase noise gradually improves as one goes farther from thecarrier. This was taken with the IF PLL powered up and IF VCO connected.



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For this plot, the charge pump was increased to 16X and the other conditions were the same.



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RF PLL Fractional Spurs

At 3200.2 MHz output frequency, the primary

fractional spur at 200 kHz is

-80 dBc, and the sub-fractional spur at 100 kHz

is below the noise floor.


fractional spur at 200 kHz is

– 88 dBc and the sub-fractional spur at 100

kHz is below the noise floor.


fractional spur at 200 kHz is –82 dBc and the

sub-fractional spur is below the noise.



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RF PLL Lock Time (With a Specturm Analyzer)

C y c l e S l i p R e d u

c t i o n E n a b l e d .

R F_

T O C = 2 5

0 0

The first step is to tune the PLL to the

final frequency. On the spectrumanalyzer, set span to 0 Hz and thefrequency to the final frequency. Thenset the resolution bandwidth. If it is toosmall, then it will make your lock timelook longer. If it is too large, frequencyresolution is lost. For this measurement,30 kHz seems just about right. Nowadjust the sweep time to match the timeinterval for the lock time measurement,3 mS in this case. The power is –9.6dBm

Now tune the PLL slightly off frequency.If the PLL is tuned 10 kHz off frequency,the output power drops to –11.1 dBm.So when the output power is –11.1 dBmor higher, we are theoretically within 10kHz. If the PLL can not be tuned to fineenough resolution, the center frequencyof the spectrum analyzer can also beoffset.

Using the external trigger to trigger offthe LE pulse, we measure the time ittakes to get and stay high enough inpower to be about 720 uS to a 10 kHztolerance.

If the timeout counter is set to zero todisable cycle slip reduction, the lock timeincreases to 2145 us. So cycle slipreduction is very worthwhile, consideringit uses no external components andrequires no additional softwareoverhead, once the part is set up.



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IF PLL Phase Noise

Above is the IF PLL phase noise with the RF PLL powered up.

The above plot was taken with the RF PLL powered down and IF VCO disconnected.



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IF PLL Spurs

Fout = 2100 MHz

Not only are the spurs below the noise, but

they are actually improving the phase noise

near the offset of the spur!

This cusping effect is due to discrete sampling

effects of the phase detector/charge pump that

occur if the loop bandwidth is wide relative to

the comparison frequency.

Fout = 2150 MHz

Spurs at 200 kHz output frequency are

–82 dBc, although the noise is still being pulleddown due to this cusping effect.

Fout = 2200 MHz

Spurs at 200 kHz are not there and actually

reducing the noise due to discrete sampling

effects.



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IF PLL Lock Time

Peak time is 73.3 uS. This peak time is

increased because the VCO tuning voltage is

approaching the rail of the charge pump when

the PLL overshoots.

Peak Time is 37.8 uS

Positive Lock time is 253 uS

Negative Lock Time is 249 uS



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Due to lack of availability for a VCO, there is no evaluation board available to evaluate the performance of the

LMX2487E. However, there are VCOs at higher frequency that are available in footprints that are not

compatible to this board that can be attached to it.

In order to demonstrate the performance of the LMX2487E, one can take the LMX2487 evaluation board and

modify it for use with an external VCO. If the VCO is one that has a footprint that is the same or pinout

compatible, the best approach would be to remove the VCO from the existing LMX2487 evaluation board and

replace the VCO. If the VCO is very different, it can be configured externally. Even though the LMX2487 is not

guaranteed to the same high frequency operation as the LMX2487E, it is the same part, just tested to different

specifications. The reason that the LMX2487E sells at a premium is that it requires a special test setup for high

frequency and the yields are a little lower. Therefore, even though the LMX2487 is being run above it’s

specified limits, it has a high probability of working at these higher frequencies, the performance is just not

guaranteed.

Finding a VCO

Now this is the main problem. Many of the VCOs require higher tuning voltage or may have long lead times.

For VCOs that specify a higher tuning voltage than the LMX2487E can supply, there are two options. One is to

use an active filter and give the specified tuning voltage. Another solution is to use a passive traditional filter

with the understanding that the upper frequency range of the VCO will be less, since the highest tuning voltage

can not be achieved.

Manufacturer Part No. Freq. Range (MHz) Tuning Voltage Universal Microwave UMT-1051-I12 7150 - 7550 0.5 – 6.0 Universal Microwave UMT-1050-I12 6800 - 6800 0.5 – 4.5 Spectrum Microwave HVA103SM-22 6800 - 8000 0 - 20

Hittite HMC532LP4 7100 - 7900 1 -13



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Replacing the VCO with a Footprint Compatible VCO

In order to replace the VCO, take component U2 and replace with the desired VCO. The VCO must be of the

VARIL-T style footprint, which is used by manufactures like Sirenza, Minicurcuits, Universal Microwave, and

Zcomm. However, it is suggested that if an LMX2487 board is being modified, the setup for that should be

verified. The dot signifies the tuning voltage.



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Appendix A: Schematics

LMX2487



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Appendix B: Build Diagrams

LMX2485



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LMX2486



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LMX2487



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Appendix C: Bill of Materials

LMX2485

Item QtyManu-

facturerPart #

Val-ue

Unit Size Voltage Tolerance Material Designator

0 25

-- C2_RF, C2pIF, C3, C3_IF, C29, C30p-- OSCin*, CPLR-- R2, R2pRF, R3p, R24, R25, R26, R27p, R30, R33p-- R100, R101, R102, R103, R104, R105, R106, C100, C101, C102

1 1 Texas Instruments LMX2485SQACBPCB er = 4.2 Top and Bottom Layers are 14 mil Getek n/a

2 4 SPC Technology SPCS-6 Stand-Offs Nylon Place in 4 holds in edge of bo

3 8 Com Con Connectors CCIJ255G 2-Pin Shunt PlasticPlace accross POWER_PLL (1-2, 3-4, 5

11-12)and POWER_VCO (1-2, 3-4

4 1 Com Con Connectors HTSM3203-4G2 4-Pin Header Plastic POWER_VCO

5 1 Com Con Connectors HTSM3203-12G2 12-Pin Header Plastic POWER_PLL

6 1 FCI Electronics 52601-S10-8 10-Pin Header Plastic uWire

7 6 Johnson Components 142-0701-851 Edge SMA MetalFtest/LD, IF_OUT, OSCin, RF_OUT,

VccVCO

8 13 Kemet C0603C470J5GAC 47 pF 603 50 V 5% C0GC12, C13, C14, C15, C16, C17, C18, C1

C27, C28, C30

9 1 Kemet C0603C180J5GAC 180 pF 604 50 V 5% C0G C4_RF


11 1 Kemet C0805C182J3GAC 1.8 nF 805 25 V 5% C0G C1_IF

12 1 Panasonic ECHU1C103JX5 10 nF 805 16 V 5% Film C2_IF

13 1 Kemet C0805C272J3GACTU 2.7 nF 603 C1_RF

14 2 Kemet C0603C104K3RAC 100 nF 603 25 V 10% X7R C20, C21

15 1 Panasonic ECHU1C473JB5 47 nF 1206 50 5 Film C2pRF

16 11 Kemet C0603C105K3PAC 1 uF 603 25 V 10% X5R C4, C5, C6, C7, C8, C9, C10, C11, C24

17 3 Kemet T494A106K010AS 10 uF 1206 10 V 10% Tantalum C1, C2

18 3 Vishay CRCW0603000ZRT1 0 ohm 0603 10 V 5% Cermaic R3_IF, R31

19 8 Vishay CRCW0603100JRT1 10 ohm 0603 10 V 5% Cermaic R1, R4, R5, R6, R7, R8, R9, R10

20 6 Vishay CRCW0603180JRT1 18 ohm 0603 10 V 5% Cermaic R3, R27, R28, R29, R33, R3

21 1 Vishay CRCW0603510FRT1 51 ohm 0603 10 V 1% Cermaic R32

22 1 Vishay CRCW0603821JRT1 820 ohm 0603 10 V 5% Cermaic R2_RF

23 1 Vishay CRCW0603392JRT1 3.9 Kohm 0603 10 V 5% Cermaic R3_RF


25 1 Vishay CRCW0603822JRT1 8.2 Kohm 0603 10 V 5% Cermaic R2_IF

26 6 Vishay CRCW0603103JRT1 10 Kohm 0603 10 V 5% Cermaic R13, R15, R17, R19, R21, R2


28 2 Steward LI0603D301R-00 Inductor nH 603 Ferrite L1, L2

29 1 Texas Instrument s LMX2485 PLL n/a 24P 3.6 n/a Silic on U1

30 1 VARIL VCO191-2450U2400 -2480

MHz U 3 V Can U2

31 1 VARIL VCO191-773U 760-780 MHz U 3 V Can U3



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LMX2486

Revision 6/24/2005

Item Qty Manufacturer Part Number Value Unit Size Voltage Tolerance Material Designator

0 21Open

(No Component)

C2pRF, C2_IF, C3_IF, C29, C100, C101R1, R2pRF, R3, R20, R21, R24, R25, R27pR30p, R100, R101, R102, R103Ftest/LD, VccPLL

1 1 Texas Instruments LMX2487SQAEBPCB εr = 3.38 4 Layer board. Thickness is 62 mils. Rogers 4003 n/a

2 4 SPC Technology SPCS-8 Stand-Offs Nylon Place in 4 holds in edge of board

3 9 Com Con Connectors CTIJ-255G 2-Pin Shunt PlasticPlace accross POWER_PLL

(1-2, 3-4, 5-6, 7-8, 9-10, 11-12, 13-14)and POWER_VCO (1-2, 3-4)




7 4 Johnson Components 142-0701-851 Edge SMA Metal IF_OUT, OSCin, RF_OUT, VccVCO

8 14 Kemet C0603C470J5GAC 47 pF 603 50 V 5% C0GC12, C13, C14, C15, C16, C17, C18,C19, C22, C23, C27, C28, C30, C33

9 1 Kemet C0603C681J3GAC 680 pF 603 25 V 5% C0G C1_IF

10 1 Kemet C0603C472J3RAC 4.7 nF 603 25 V 5% X7R C3_RF

11 1 Kemet C0603C682J3RAC 6.8 nF 603 25 V 5% X7R C1_RF

12 1 Kemet C1206C472J5GAC 4.7 nF 1206 50 V 5% C0G C2pIF

13 1 Kemet C0603C153J3RAC 15 nF 603 25 V 5% X7R C4_RF

14 1 Kemet C1206C103J3GAC 10 nF 1206 25 V 5% C0G C32


16 1 Kemet C0805C224J4RAC 220 nF 805 16 V 5% X7R C2_RF

17 13 Kemet C0603C105K4PAC 1 uF 603 16 V 10% X5RC3, C4, C5, C6, C7, C8, C9,

C10, C11, C24, C25, C26, C31

18 2 Kemet C0805C106K8PAC 10 uF 805 10 V 10% X5R C1, C2

19 1 Vishay CRCW0603000ZRT1 0 ohm 0603 10 V 5% Cermaic R3_IF

20 9 Vishay CRCW0603100JRT1 10 ohm 0603 10 V 5% Cermaic R4, R5, R6, R7, R8, R9, R10, R11, R26

21 8 Vishay CRCW0603180JRT1 18 ohm 0603 10 V 5% Cermaic R27, R28, R29, R30, R31, R32, L1, L2


23 1 Vishay CRCW0603330FRT1 33 ohm 603 10 V 5% Cermaic R4_RF

24 1 Vishay CRCW0603560FRT1 56 ohm 603 10 V 5% Cermaic R3_RF

25 1 Vishay CRCW0603151JRT1 150 ohm 603 10 V 5% Cermaic R2_RF


27 5 Vishay CRCW0603103JRT1 10 Kohm 0603 10 V 5% Cermaic R12, R14, R16, R18, R22

28 5 Vishay CRCW0603123JRT1 12 Kohm 0603 10 V 5% Cermaic R13, R15, R17, R19, R23

29 1 Texas Instruments LMX2486SQ PLL n/a 24P 3.6 V n/a Silicon U1

30 1 VARIL VCO690-3300T 3120-3300 MHz T 5 V Can U2

31 1 VARIL VCO190-2200T 2100-2200 MHz T 5 V Can U3

32 1 Texas Instruments LP3985IM5X-3.3 3.3 V SOT23 3.3V Silicon U4



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LMX2487

# Qty Manufacturer Part # Value Unit Size Voltage Tolerance Material Designator

0 27

-- C2_RF, C2pIF, C3, C3_IF, C29, C30p-- OSCin*, U1,CPLR-- R1, R2, R2pRF, R3p, R24, R25, R26, R27p, R30, R33p-- R100, R101, R102, R103, R104, R105, R106, C100, C101, C102

1 1 Texas Instruments LMX2487ESQACBPCB er = 4.2 Top and Bottom Layers are 14 mil Getek n/a

2 4 SPC Technology SPCS-6 Stand-Offs Nylon Place in 4 holds in edge of board

3 8 Com Con Connectors CCIJ255G 2-Pin Shunt PlasticPlace accross POWER_PLL (1-2, 3-4, 5-6, 7-8, 9-10, 1

and POWER_VCO (1-2, 3-4)




7 6 Johnson Components 142-0701-851 Edge SMA Metal Ftest/LD, IF_OUT, OSCin, RF_OUT, VccPLL, VccV

8 13 Kemet C0603C470J5GAC 47 pF 0603 50 V 5% C0G C12, C13, C14, C15, C16, C17, C18, C19, C22, C23, C27,



11 1 Kemet C0603C681J3GAC 680 pF 0603 25 V 5% C0G C1_IF

12 1 Kemet C0805C472K3RAC 4.7 nF 0805 16 V 5% X7R C2_IF

13 1 Kemet C0603C102J5GAC 1 nF 0603 25 V 5% C0G C1_RF


15 1 Kemet C0805C183K3RAC 18 nF 1206 16 V 20% X7R C2pRF

16 11 Kemet C0603C105K3PAC 1 uF 0603 25 V 10% X5R C4, C5, C6, C7, C8, C9, C10, C11, C24, C25, C2

17 2 Kemet T494A106K010AS 10 uF 1206 10 V 10% Tantalum C1, C2

18 2 Vishay CRCW0603000ZRT1 0 ohm 0603 10 V 5% Cermaic R3_IF, R3119 8 Vishay CRCW0603100JRT1 10 ohm 0603 10 V 5% Cermaic R4, R5, R6, R7, R8, R9, R10, R11

20 6 Vishay CRCW0603180JRT1 18 ohm 0603 10 V 5% Cermaic R3, R27, R28, R29, R33, R34








28 2 Steward LI0603D301R-00 Inductor nH 603 Ferrite L1, L2

29 1 VARIL MHz U 3 V Can U2

30 1 VARIL VCO191-773U 760-780 MHz U 3 V Can U3



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34 SNAU137 LMX248x Evaluation Board Instructions Revised – March 2014Copyright © 2014, Texas Instruments Incorporated

Appendix D: Quick Start for EVM Communications

Codeloader is the software used to communicate with the EVM (Please download the latest version fromTI.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 uWire interface from the computer.

OPTION 1

Open Codeloader.exe Click “Select Device” Click “Port Setup” tab Click “LPT” (in Communication

Mode)

OPTION 2

http://www.ti.com/http://www.ti.com/tool/codeloaderhttp://www.ti.com/tool/codeloaderhttp://www.ti.com/tool/codeloaderhttp://www.ti.com/tool/codeloaderhttp://www.ti.com/


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Revised – March 2014 LMX248x Evaluation Board Instructions SNAU137 35 Copyright © 2014, Texas Instruments Incorporated

The Adapter BoardThis table describes the pins configuration on the adapter board for each EVM board (See examples below table)

EVMJumper Bank Code Loader Configuration

A B C D E F G H

LMX2581 A4 B1 C2 E5 F1 G1 H1 BUFEN (pin 1), Trigger (pin 7)LMX2541 A4 C3 E4 F1 G1 H1 CE (pin 1), Trigger (pin 10)

LMK0400x A0 C3 E5 F1 G1 H1 GOE (pin 7)

LMK01000 A0 C1 E5 F1 G1 H1 GOE (pin 7)

LMK030xx A0 C1 E5 F1 G1 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 D2 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 SYNC (pin 7)

LMK03806 A0 C1 E5 F0 G0 H1LMK04100 A0 C1 E5 F1 G1 H1

Example adapter configuration (LMK01801)

Open Codeloader.exe Click “Select Device” Click “Port Setup” Tab Click “USB” (in Communication

Mode)

* Remember to also make modifications in “Pin Configuration” Section according to Table above



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Documents

Texas Instruments VCO LMX248x Evaluation Board User's Guide Snau137a