National Semiconductor LMK03000C Manual de usuario

LMK03000C

Precision Clock Conditioner with Integrated VCO

Evaluation Board Operating Instructions

4-16-2009

National Semiconductor Corporation

Interface

2900 Semiconductor Dr.

MS A2-600

Santa Clara, CA, 95052-8090

LMK03000C EVALUATION BOARD OPERATING INSTRUCTIONS

TABLE OF CONTENTS

GENERAL DESCRIPTION ............................................................................................................................... 3

LOOP FILTER #1........................................................................................................................................... 3

READ FIRST,BASIC OPERATION................................................................................................................... 4

BOARD INFORMATION.................................................................................................................................. 8

OSCin ................................................................................................................................................... 8

Fout....................................................................................................................................................... 8

Loop Filter ............................................................................................................................................ 8

Features of the board............................................................................................................................. 9

Other Important Notes .......................................................................................................................... 9

Evaluation Board Revision v1.0 Errata................................................................................................. 9

RECOMMENDED EQUIPMENT...................................................................................................................... 10

PHASE NOISE ............................................................................................................................................. 11

DELAYS...................................................................................................................................................... 13

CODELOADER SETTINGS............................................................................................................................ 14

APPENDIX A: VCO PERFORMANCE............................................................................................................ 18

APPENDIX B: IMPACT OF REFERENCE ON PHASE NOISE............................................................................. 20

APPENDIX C: SCHEMATICS ........................................................................................................................ 21

APPENDIX D: BILL OF MATERIALS............................................................................................................. 24

APPENDIX E: BUILD DIAGRAM .................................................................................................................. 26

LMK03000C EVALUATION BOARD OPERATING INSTRUCTIONS

General Description

The LMK03000C Evaluation Board simplifies evaluation of the LMK03000C Precision Clock

Conditioner with Integrated VCO. The package consists of an evaluation board and CodeLoader

software. The CodeLoader software will run on a Windows 2000 or Windows XP PC. The purpose of

the CodeLoader software is to program the internal registers of the LMK03000C device through a

MICROWIRETM interface.

Loop Filter #1

Phase Margin 70.0º Kφ3200 uA

Loop Bandwidth 55.3 kHz fPD 9.72 MHz

Crystal Frequency 19.44 MHz Output Frequency 1185 to 1296 MHz

Supply Voltage 3.3 Volts VCO Gain 8 MHz/Volt

VCO

open

12 nF1.8 kΩ

150 pF 110 pF

600 Ω200 Ω

CPout

Charge Pump

C2R2

R3 R4

C3 C4

Loop filter #1 is selected by placing a 0 ohm resistor on pad R22.

This loop filter has been designed for optimal RMS jitter using a low noise

reference.

LMK03000C EVALUATION BOARD OPERATING INSTRUCTIONS

Read first, Basic Operation

Read the document, “Installing CodeLoader 4 & USB Driver” for instructions to prepare the computer

for usage with the evaluation board before continuing with the hardware setup.

For basic operation…

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

board

2. Connect the CodeLoader cable to the uWire header located in the lower left.

LMK03000C EVALUATION BOARD OPERATING INSTRUCTIONS

Read first, Basic Operation (Continued)

3. Connect…

•PC directly to the evaluation board with the LPT to uWire cable, plugging the cable

into an LPT port on the computer and then the 10 pin ribbon connector to the

evaluation board. This setup is shown below. The cable can be removed after

programming to minimize noise and EMI.

•Available separately, the USB <--> uWire board to the PC with the USB cable and the

USB <--> uWire board to the evaluation board with the 10 pin ribbon cable.

LPT Setup

LMK03000C EVALUATION BOARD OPERATING INSTRUCTIONS

Read first, Basic Operation (Continued)

4. Start CodeLoader 4.

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

6. Select the default mode by clicking “Mode” Æ“19.44 MHz OSCin”

LMK03000C EVALUATION BOARD OPERATING INSTRUCTIONS

Read first, Basic Operation (Continued)

7. Enable output to be measured, any of CLKout(0-7) or EN_Fout from either Clock Outputs or

Bits/Pins tab.

8. Program the part by clicking “Keyboard Controls” Æ“Load Device” or by pressing Ctrl+L.

9. Make measurements… After programming, the uWire cable can be unplugged from the

evaluation board to minimize noise and EMI.

LMK03000C EVALUATION BOARD OPERATING INSTRUCTIONS

Board Information

OSCin

By default the board is configured to use the on-board crystal oscillator. It is also possible to use the

board with a single ended or differential reference source at the OSCin port. Below are several

possible configurations for driving OSCin.

OSCin using on board crystal oscillator [default]

0 ohm R8, R11, R20 [power to crystal oscillator], R109

39 ohm R9 [can also be 0 ohm – depends on oscillator output power, 39 ohms

to be a voltage divider]

51 ohm R15

0.1 uF C35, C36 (C5 is a 0.1 uF 0402 cap which may be moved to C36)

Open C4, C5

R7, R10, R12, R13, R14, R16, R17, R79, R112

Differential OSCin setup

0 ohm R7, R8, R10, R13

100 ohm R44

0.1 uF C5, C35 (C36 is a 0.1 uF 0402 cap which may be moved to C5)

Open C4, C36

R11, R12, R14, R15, R16, R79

R20 [remove power from crystal oscillator for noise reasons]

Single ended OSCin setup

0 ohm R7, R8

51 ohm R15

0.1 uF C35, C36 (C5 is a 0.1 uF 0402 cap which may be moved to C36)

Open C4, C5

R10, R11, R12, R13, R14, R16, R17, R79

R20 [remove power from crystal oscillator for noise reasons]

Fout

Fout allows direct access to the internal VCO before the clock distribution section. The EN_Fout bit

must be selected to enable Fout. A 3 dB pad is placed on R80, R81, and R82.

Loop Filter

R22 and R5 form a “resistor switch” which allows either one of two different loop filters to be

selected.

Loop Filter Resistor

Switch Loop Filter

Components Default Loop

Bandwidth

Loop Filter #1

[default] R22 Shorted C1, C2, C2p, R2 59.1 kHz

Loop Filter #2 R5 Shorted C1_AUX, C2_AUX,

C2p_AUX, R2_AUX 77 Hz

LMK03000C EVALUATION BOARD OPERATING INSTRUCTIONS

Features of the board

•Either one of two loop filters can be selected by shorting either R22 or R5. More info

about each loop filter can be found in the General Description and Appendix A.

•Test points for each of the uWire lines are scattered in the lower left corner of the board

and include: GOE_TP, DATAuWire, CLKuWire, LEuWire, SYNC_TP, and LD_TP.

•Ground is located on the unstuffed 10 pin header on the left side of the board.

•Ground is located on the GND_tp2 in the upper left corner of the board and GND_tp1

located to the right of the Vcc SMA connector.

•Ground is located on the bottom side of the board on each pad of the unstuffed 10 pin

header GND_J2.

•Vcc is located on the unstuffed 10 pin header on the upper left side of the board.

•Vcc is located on VccPlane test point located to the right of the Vcc SMA.

•Vcc is located on the bottom side of the board on each pad of the unstuffed 10 pin

header VCC_J2

Other Important Notes

•When changing the OSCin frequency, the OSCin frequency register needs to be changed

to match.

•Toggle the SYNC* pin to synchronize the clock outputs when in divided mode.

•For both loop filters, a helper silkscreen is offset from the loop filters to help identify the

components according to National Semiconductor’s traditional reference designators

associated with loop filters.

Evaluation Board Revision v1.0 Errata

•SYNC* is labeled on the PCB as SYNC, however the logic of SYNC* is still active low!

LMK03000C EVALUATION BOARD OPERATING INSTRUCTIONS

Recommended Equipment

Power Supply

The Power Supply should be a low noise power supply. An Agilent 6623A Triple power supply with LC

filters on the output to reduce noise was used in creating these evaluation board instructions.

Phase Noise / Spectrum Analyzer

For measuring phase noise an Agilent E5052A is recommended. An Agilent E4445A PSA Spectrum

Analyzer with the Phase Noise option is also usable although the architecture of the E5052A is superior

for phase noise measurements. At frequencies less than 100 MHz the local oscillator noise of the PSA

is too high and measurements will be of the local oscillator, not the device under test.

Oscilloscope

For measuring delay an Agilent Infiniium DSO81204A was used.

Reference Oscillator

The on board crystal oscillator will provide a low noise reference signal to the device at offsets greater

than 1 kHz.

Note: The default loop filter has a loop bandwidth of ~60 kHz. Inside the loop bandwidth of a PLL the

noise is greatly affected by any noise on the reference oscillator (OSCin). Therefore any noise on the

oscillator less than 60 kHz will be passed through and seen on the outputs. For this reason the main

output of a Signal Generator is not recommended for driving OSCin in this setup.

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