Texas Instruments LMX2594 Manuale utente

LMX2594 EVM Instructions – 15-GHz Wideband

Low Noise PLL With Integrated VCO

User's Guide

Literature Number: SNAU210

March 2017

2SNAU210–March 2017

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Table of Contents

Contents

1 Trademarks......................................................................................................................... 3

2 Evaluation Board Setup ....................................................................................................... 4

3 EVM Description .................................................................................................................. 5

3.1 Installing the Software................................................................................................... 7

4 Bringing LMX2594 to a Lock State ......................................................................................... 9

5 Current Loop Filter Configuration......................................................................................... 11

6 Key Results to Expect......................................................................................................... 12

Appendix A Schematic................................................................................................................ 13

Appendix B Bill of Materials......................................................................................................... 14

Appendix C Board Layers Stack-Up.............................................................................................. 16

Appendix D Changing Reference Oscillator and Setup ................................................................... 17

Appendix E Connecting Reference Pro ......................................................................................... 19

Appendix F Ramping Feature ...................................................................................................... 22

F.1 Ramping Example Waveform........................................................................................ 22

Appendix G SYSREF Feature ...................................................................................................... 24

Appendix H VCO Calibration........................................................................................................ 29

Appendix I Enabling Onboard DC-DC Buck Converter (TPS62150) .................................................. 31

SNAU210–March 2017

LMX2594 EVM Instructions – 15-GHz Wideband Low Noise PLL With

Integrated VCO

User's Guide

SNAU210–March 2017

LMX2594 EVM Instructions – 15-GHz Wideband Low Noise

PLL With Integrated VCO

Figure 1. LMX2594EVM

1 Trademarks

Evaluation Board Setup

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4SNAU210–March 2017

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LMX2594 EVM Instructions – 15-GHz Wideband Low Noise PLL With

Integrated VCO

2 Evaluation Board Setup

Figure 2. LMX2594EVM Setup

SPACER

1. Power:

a. Set power supply to 3.3 V with 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 LMX2594:

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 ribbon cable from Reference Pro to LMX2594EVM as shown above.

4. Output:

a. Connect RFoutAM or RFoutAP to a phase noise Analyzer. Connect a 50-Ωon the unused output if

you are using only single-ended. Use a balun if you are using differential.

Voltage Regulator

Not Enabled

Diff. RF Output A

Diff. RF Output B

LMX2594

100 MHz XO

Diff. Reference Input

Single Ended Signal

Can Be Used

Power Supply 3.3 Volt

Sync

Sys Ref

Lock Indicator LED

Switch to Select:

1) SPI read block

2) Lock Indicator

(1 or 2)

Loop Filter

Components (*_LF)

Serial Interface Pin-out

2 4 6 8 10

1 3 5 7 9

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EVM Description

SNAU210–March 2017

LMX2594 EVM Instructions – 15-GHz Wideband Low Noise PLL With

Integrated VCO

3 EVM Description

The LMX2594 is populated on a 4-layer PCB. This brief description should help you use the EVM:

Figure 3. LMX2594EVM Description

The serial interface pin description is as follow:

Table 1. EVM and Serial Interface Connector

Description

NO. NAME

1RAMPDIR and CE (Choose with

Resistors on Board)

2 CSB

3 MUXout

4 SDI

5 Not Used

6 GND

7 RampCLK

8 SCK

9 SysRefReq

10 SYNC

EVM Description

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6SNAU210–March 2017

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LMX2594 EVM Instructions – 15-GHz Wideband Low Noise PLL With

Integrated VCO

The LD switch should be on to enable Lock indicator:

Figure 4. LD Lock Detect

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EVM Description

SNAU210–March 2017

LMX2594 EVM Instructions – 15-GHz Wideband Low Noise PLL With

Integrated VCO

3.1 Installing 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 LMX2594: Click on Select Device From menu bar →PLL+VCO→LMX2594

Figure 5. Search for LMX2594 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 on TICS Pro

EVM Description

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8SNAU210–March 2017

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LMX2594 EVM Instructions – 15-GHz Wideband Low Noise PLL With

Integrated VCO

5. Click on identify and you should see the LED (MSP430 Supplied) Blink on Reference Pro

Figure 7. USB Communication Between TICS Pro and Reference Pro

www.ti.com

Bringing LMX2594 to a Lock State

SNAU210–March 2017

LMX2594 EVM Instructions – 15-GHz Wideband Low Noise PLL With

Integrated VCO

4 Bringing LMX2594 to a Lock State

Load the default mode by selecting it as shown in Figure 8:

Figure 8. TICS Pro GUI LMX2594 Default Configuration

Bringing LMX2594 to a Lock State

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10 SNAU210–March 2017

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LMX2594 EVM Instructions – 15-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

Indice

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