Texas Instruments LMK04208 Manual de usuario

LMK04208

User's Guide

Literature Number: SNAU200

September 2016

2SNAU200–September 2016

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Table of Contents

Contents

1 Introduction......................................................................................................................... 3

2 Evaluation Board Kit Contents............................................................................................... 3

3 Quick Start.......................................................................................................................... 4

3.1 Quick Start Description.................................................................................................. 5

4 PLL Loop Filters and Loop Parameters................................................................................... 7

4.1 PLL1 Loop Filter.......................................................................................................... 7

4.2 PLL2 Loop Filter.......................................................................................................... 7

5 Default TICS Pro Modes for the LMK04208.............................................................................. 8

6 Using TICS Pro to Program the LMK04208.............................................................................. 8

6.1 Start TICS Pro Application.............................................................................................. 8

6.2 Select Device ............................................................................................................. 8

6.3 Setup and Confirm Communications .................................................................................. 8

6.4 Restoring a Default Mode............................................................................................... 9

6.5 Program/Load Device.................................................................................................... 9

6.6 Visual Confirmation of Frequency Lock ............................................................................... 9

6.7 Enable Clock Outputs.................................................................................................. 10

7 Evaluation Board Inputs and Outputs ................................................................................... 11

8 Recommended Test Equipment ........................................................................................... 14

9 Schematics........................................................................................................................ 15

10 Bill of Materials .................................................................................................................. 20

Appendix A TICS Pro Usage ........................................................................................................ 22

A.1 Communication Setup Window...................................................................................... 22

A.2 CLKins and PLLs Page............................................................................................... 23

A.3 Clock Outputs Page................................................................................................... 24

A.4 User Controls Page ................................................................................................... 25

A.5 Raw Registers Page .................................................................................................. 26

A.6 Burst Mode Page...................................................................................................... 27

Appendix B Typical Phase Noise Performance Plots ...................................................................... 28

B.1 VCXO Phase Noise 122.88 MHz ................................................................................... 29

B.2 Clock Output Phase Noise Measurements ........................................................................ 30

SNAU200–September 2016

LMK04208 User’s Guide

MICROWIRE is a trademark of Texas Instruments.

User's Guide

SNAU200–September 2016

LMK04208 User’s Guide

1 Introduction

This user's guide describes how to set up and operate the LMK04208 evaluation module (EVM). The

LMK04208 is the industry's highest performance clock conditioner with JEDEC JESD204B support.

2 Evaluation Board Kit Contents

The evaluation board kit includes what is shown in Table 1.

Table 1. EVM Contents

SV601293 -001

Evaluation Board (1) LMK04208 Evaluation Board

USB Communications (1) USB2ANY

Laptop or PC

4 to 5 V

4Program with TICS Pro

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CLKin1*

Reference clock from

signal generator or other

external source.

122.88 MHz (Default)

Power

Reference

CLKout5*

LVPECL

CLKout5

CLKin0

CLKin0*

These SMAs not populated by default.

With PCB change, can be used for reference input for

single PLL mode.

CLKout1*

LVDS or

LVCMOS

CLKout1

Vcc

CLKout4*

LVDS or

LVCMOS

CLKout4

D1, LD_TP

Status_LD pin

10 pin cable

OSCout*

LVDS or

LVCMOS

OSCout

CLKout0

LVPECL

CLKout0*

D4, Holdover_TP

Status_Holdover pin

Default is LDO to IC.

Do not connect 4 to 5 V

direct to IC (typical 3.3 V)

USB2ANY

Programming

Connection

OSCin

OSCin*

USB2ANY

USB Cable

122.88 MHz VCXO

CLKin1_IND

Place 270 ohm on R46 to connect

CLKin0_IND

Place 270 ohm on R47 to connect

SYNC_TP

All CLKout and OSCout outputs are capable of

LVDS, LVPECL, and LVCMOS output formats.

However the output format suited to default

PCB configuration (if emitter resistors are

placed for LVPECL) is identified above.

Quick Start

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LMK04208 User’s Guide

3 Quick Start

Figure 1. Quick Start Diagram

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Quick Start

SNAU200–September 2016

LMK04208 User’s Guide

3.1 Quick Start Description

The LMK04208 EVM allows full verification of the device functionality and performance specifications. To

quickly set up and operate the board with basic equipment, refer to the quick start procedure below and

test setup shown in Figure 1.

1. Connect a voltage of 4.5 volts to the Vcc SMA connector or terminal block. Device operates at 3.3 V

using onboard LP3878-ADJ LDO. VCXO operates at 3.3 V using onboard LP5900 LDO.

2. Connect a reference clock to the CLKin1 port from a signal generator or other source. Use 122.88 MHz

for default. Exact frequency and input port (CLKin0/CLKin1) depends on programming.

3. Connect uWire (MICROWIRE) header to a computer using USB2ANY.

4. Program the device with TICS Pro. TICS Pro is available for download at: http://www.ti.com/tool/TICS

Pro. After starting TICS Pro.

(a) Choose LMK04208 from the “Select Device" →"Clock Generator/Jitter Cleaner (Dual Loop)” Menu.

(b) Open the Communication Setup window by click "USB Communications →Interface".

• Confirm that USB2ANY is selected.

• Select specific USB2ANY interface to use. click 'Identify' to confirm selected USB2ANY and

valid communications to USB2ANY by blinking LED.

• If LMK04208EVM or USB2ANY available, the software may be run in DemoMode for evaluation

and generation of register programming data.

• Press Close to exit Communication Setup.

“CLKin1 122.88 MHz, 122.88 MHz VCXO”

(d) Click "Write All Registers" or press Ctrl-L to load all registers. Alternatively from menu bar click

"USB communications" →"Write All Registers."

5. Measurements may be made at an active CLKout port via its SMA connector. Default configuration

configures CLKout4

3.1.1 CLKout Page Description

Figure 2. Clock Outputs Page CLKout Path Description Diagram

1. CLKoutX_DDLY for controlling digital delay. Programmed delay value takes effect on SYNC of divider.

2. CLKoutX_HS for finer resolution of digital delay. Advances waveform ½ device clock cycles, -0.5 to

digital delay.

3. CLKoutX_DIV, divider for the output channel.

4. CLKoutX_ADLY, Analog delay if enabled with #5.

5. CLKoutX_ADLY_SEL, Analog delay select.

6. CLKoutX_TYPE, clock output format.

7. NO_SYNC_CLKoutX, when checked, output will never be SYNCed or held in SYNC.

8. Clock output identifier.

9. Calculated clock output frequency.

10. CLKoutX_PD, power down the entire CLKoutX group.

Quick Start

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3.1.2 TICS Pro Tips

• Mousing over controls shows help in the "Context" window to bottom left of screen.

• In bottom left of screen is displayed a "General" help for the page. After context help has been

displayed, click this tab to view again.

• To enable read back for LMK04208, a 0-Ωresistor must be placed at R59, this shares

Status_Holdover for use as read back. R59 is located just below the red D4 Status_Holdover LED.

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PLL Loop Filters and Loop Parameters

SNAU200–September 2016

LMK04208 User’s Guide

4 PLL Loop Filters and Loop Parameters

In jitter cleaning applications that use a cascaded or dual PLL architecture, the first PLL’s purpose is to

substitute the phase noise of a low-noise oscillator (VCXO or crystal resonator) for the phase noise of a

“dirty” reference clock. The first PLL is typically configured with a narrow loop bandwidth in order to

minimize the impact of the reference clock phase noise. The reference clock consequently serves only as

a frequency reference.

The loop filters on the LMK04208 evaluation board are setup using the approach above. The loop filter for

PLL1 has been configured for a narrow loop bandwidth (< 100 Hz). Table 2 and Table 3 contain the

parameters for PLL1 and PLL2 for using the default VCXO.

TI’s Clock Design Tool can be used to optimize PLL phase noise/jitter for given specifications. See:

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

4.1 PLL1 Loop Filter

(1) Loop Bandwidth and Phase Margin is a function of Kφ, Kvco, N as well as loop components. Changing Kφand N by device

programming will change the loop bandwidth.

Table 2. PLL1 Loop Filter Parameters for VCXO with 8 kHz/V Tuning Sensitivity(1)

PLL1 using 122.88 MHz VCXO (Epson VG-4513CA-122.8800M-GFCT3)

Loop Bandwidth 20 Hz Phase Margin 50˚

Kφ(Charge Pump) 100 µA Tuning Sensitivity (KVCO)8 kHz/V

Reference Clock Frequency 122.88 MHz Phase Detector Freq 1.024 MHz

PLL Total N 120 VCXO Frequency 122.88 MHz

(PLL1 feedback and PLL2

reference)

Loop Filter Components C1_VCXO = 150 nF C2_VCXO_0603 = 1 µF R2_VCXO = 22 kΩ

4.2 PLL2 Loop Filter

(1) Loop Bandwidth is a function of Kφ, Kvco, N as well as loop components. Changing Kφand N will change the loop bandwidth.

Table 3. PLL2 Loop Filter Parameters using Integrated VCO(1)

PLL2 using internal VCO

Loop Bandwidth 320 kHz Phase Margin 84˚

Kφ(Charge Pump) 3.2 mA Tuning Sensitivity (KVCO)27 MHz/V

Reference Clock Frequency 122.88 MHz Phase Detector Freq 122.88 MHz

PLL Total N 24 VCO Frequency 2949.12 MHz

Loop Filter Components C1_VCO = 0.022 nF C2_VCO = 18 nF Integrated C3 and C4 = 0.01 nF

R2_VCO = 0.56 kΩIntegrated R3 and R4 = 200 Ω

Default TICS Pro Modes for the LMK04208

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LMK04208 User’s Guide

5 Default TICS Pro Modes for the LMK04208

TICS Pro saves the state of the selected LMK04208 device when exiting the software. To ensure a

common starting point, the following modes listed in Table 4 may be restored by clicking “Mode” and

selecting the appropriate device configuration.

Table 4. Default TICS Pro Modes for the LMK04208

Default TICS Pro Mode Device Mode CLKin Frequency OSCin Frequency

CLKin1 122.88 MHz, OSCin

122.88 MHz Dual PLL, Internal VCO 122.88 MHz 122.88 MHz

CLKin0 122.88 MHz, Dual

Loop 0-delay, 122.88 MHz

VCXO

Dual PLL 0-delay, Internal

VCO 122.88 MHz 122.88 MHz

Figure 3. Selecting a Default Mode for the LMK04208 Device

6 Using TICS Pro to Program the LMK04208

This section will demonstrate how to use TICS Pro. Making measurements with the LMK04208 device will

serve as an example. For more information on using TICS Pro, refer to Appendix A and TICS Pro

instructions, "Help" →"TICS Pro User Manual."

Before proceeding, be sure to follow the instructions in Section 3 to ensure proper connections.

6.1 Start TICS Pro Application

Click “Start” →“Programs” →“Texas Instruments” →“TICS Pro” →“TICS Pro”

The TICS Pro program is installed by default to the TICS Pro application group.

6.2 Select Device

Click “Select Device" →"Clock Generator/Jitter Cleaner (Dual Loop)" →"LMK04208”

Upon start, TICS Pro will load the last used device. To load a different device, click “Select Device” from

the menu bar, then select the subgroup and finally, the device to load. For this example, the LMK04208 is

chosen.

6.3 Setup and Confirm Communications

If not already plugged in, connect USB2ANY interface. Click "USB communications" →"Interface"

Ensure USB2ANY is selected in the Communication Setup window. Press the Identify button to confirm

desired USB2ANY is selected by observing blinking LED. Other instances of TICS Pro can be used at the

same time, but if a USB2ANY is used in one application, in cannot be used in the second and may not

show up.

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Using TICS Pro to Program the LMK04208

SNAU200–September 2016

LMK04208 User’s Guide

6.4 Restoring a Default Mode

Click “Mode” →“CLKin1 122.88 MHz, 122.88 MHz VCXO”; then press Ctrl+L.

Figure 4. Setting the Default Mode for LMK04208

For the purpose of this walkthrough, a default mode will be loaded to ensure a common starting point.

This is important because when TICS Pro is closed, it remembers the last settings used for a particular

device. Again, remember to press Ctrl+L as the first step after loading a default mode.

6.5 Program/Load Device

Provided the communication settings are correct, press the “Ctrl+L” shortcut or click “Keyboard Controls”

→“Load Device” from the menu to program the device to the current state of the newly loaded LMK04208

file.

Figure 5. Loading the Device

Once the device has been initially loaded, TICS Pro will automatically program changed registers so it is

not necessary to reload the device upon subsequent changes in the device configuration. It is possible to

disable this functionality by ensuring there is no checkmark by the “Options” →“AutoUpdate.”

Because a default mode will be restored in the next step, this step isn’t really needed but included to

emphasize the importance of pressing “Ctrl+L” to load the device at least once after starting TICS Pro,

restoring a mode, or restoring a saved setup using the File menu.

See TICS Pro instructions by clicking "Help" →"TICS Pro User Manual." This contains information on

troubleshooting communications.

6.6 Visual Confirmation of Frequency Lock

After a default mode is restored and loaded, LED D1 will illuminate when PLL1 and PLL2 are locked to the

reference clock applied to CLKin1. This assumes LD_MUX = PLL1 & PLL2 DLD and LD_TYPE = Output

(Push-Pull).

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Using TICS Pro to Program the LMK04208

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6.7 Enable Clock Outputs

While the LMK04208 offers programmable clock output buffer formats, the evaluation board is shipped

with pre-configured output terminations to match the default buffer type for each output.

To measure Phase noise at one of the clock outputs, for example CLKout0:

1. Click on the Clock Outputs page,

2. Uncheck “Powerdown” in the Clock output box to enable the channel. (10)

3. Set the following as needed:

(a) Digital Delay value (1)

(b) Clock Divider value (3)

floor of output.

Figure 6. Setting Digital Delay, Clock Divider, Analog Delay and Output Format

4. Depending on the configured output type, the clock output SMAs can be interfaced to a test instrument

with a single-ended 50-Ωinput as follows.

(a) For LVDS:

(i) A balun (like ADT2-1T or high quality Prodyn BIB-100G) is recommended for differential-to-

single-ended conversion.

(b) For LVPECL:

(i) A balun can be used, or

(ii) One side of the LVPECL signal can be terminated with a 50-Ωload and the other side can be

run single-ended to the instrument.

5. The phase noise may be measured with a spectrum analyzer or signal source analyzer.

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