Texas Instruments LMX2595EVM Manuale utente

SNAU219–June 2017

LMX2595 EVM Instructions – 19-GHz Wideband Low Noise PLL With

Integrated VCO

User's Guide

SNAU219–June 2017

LMX2595 EVM Instructions – 19-GHz Wideband Low Noise

PLL With Integrated VCO

This Evaluation Module is for the LMX2595, which is the first PLL with integrated VCO in industry to get

fundamental VCO output up to 15 GHz. The industry leading PLL FOM is -236 dBc/Hz with 1/f of -129

dBc/Hz. This device supports JESD204B standard (it can generate or repeat the SYSREF signal) which

makes it ideal to clock high speed data converters. The integrated jitter from the EVM measurements is

less than 50 fs at 9 GHz carrier frequency. By providing a SYNC signal, the user can synchronize the

output phase across multiple LMX2595 devices. LMX2595 can also generate a frequency ramp which can

be demonstrated in this evaluation module. With an on-board oscillator, setup process only requires a

3.3V power supply and an included Reference Pro module (For SPI Programming interface). The software

is simple, with an intuitive and user friendly GUI.

Figure 1. LMX2595EVM

Contents

1 Evaluation Board Setup .................................................................................................... 3

2 EVM Description ............................................................................................................. 4

3 Bringing LMX2595 to a Lock State........................................................................................ 8

4 Current Loop Filter Configuration ........................................................................................ 10

5 Key Results to Expect ..................................................................................................... 11

Appendix A Schematic .......................................................................................................... 12

Appendix B Bill of Materials .................................................................................................... 13

Appendix C Board Layers Stack-Up........................................................................................... 15

Appendix D Changing Reference Oscillator and Setup..................................................................... 16

Appendix E Connecting Reference Pro....................................................................................... 18

Appendix F Ramping Feature ................................................................................................. 21

Appendix G SYSREF Feature ................................................................................................. 23

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LMX2595 EVM Instructions – 19-GHz Wideband Low Noise PLL With

Integrated VCO

Appendix H VCO Calibration ................................................................................................... 28

Appendix I Enabling Onboard DC-DC Buck Converter (TPS62150)..................................................... 30

Appendix J Appendix J: Using the VCO Doubler ........................................................................... 31

Trademarks

All trademarks are the property of their respective owners.

3.3 Volt supply

LMX2594

Output to

analyzer

Serial Interface

Reference

Pro LMX2595EVM

USB ÆPC

Reference XO

If unused,

terminate

(50ohm)

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Evaluation Board Setup

SNAU219–June 2017

LMX2595 EVM Instructions – 19-GHz Wideband Low Noise PLL With

Integrated VCO

1 Evaluation Board Setup

Figure 2. LMX2595EVM 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 LMX2595:

(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 LMX2595EVM 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.

Power supply.

3.3 Volt

Voltage regulator

not enabled Diff. RF output A

Diff. RF output B

100 MHz XO

Diff. reference input

Single ended signal

can be used.

Lock indicator LED

Switch to select:

1) SPI Read back

2) Lock indicator

(1 OR 2)

LMX2595

Serial interface

Loop filter components

(*_LF)

Serial interface pin out

Sync

SysRef

EVM Description

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LMX2595 EVM Instructions – 19-GHz Wideband Low Noise PLL With

Integrated VCO

2 EVM Description

The LMX2595 is populated on a 4-layer PCB. This brief description should help you use the EVM:

Figure 3. LMX2595EVM 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

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EVM Description

SNAU219–June 2017

LMX2595 EVM Instructions – 19-GHz Wideband Low Noise PLL With

Integrated VCO

The LD switch must be on to enable Lock indicator:

Figure 4. LD Lock Detect

EVM Description

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LMX2595 EVM Instructions – 19-GHz Wideband Low Noise PLL With

Integrated VCO

2.1 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 LMX2595: Click on Select Device From menu bar →PLL+VCO→LMX2595

Figure 5. Search for LMX2595 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

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EVM Description

SNAU219–June 2017

LMX2595 EVM Instructions – 19-GHz Wideband Low Noise PLL With

Integrated VCO

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

Figure 7. USB Communication Between TICS Pro and Reference Pro

Bringing LMX2595 to a Lock State

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LMX2595 EVM Instructions – 19-GHz Wideband Low Noise PLL With

Integrated VCO

3 Bringing LMX2595 to a Lock State

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

Figure 8. TICS Pro GUI LMX2595 Default Configuration

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Bringing LMX2595 to a Lock State

SNAU219–June 2017

LMX2595 EVM Instructions – 19-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

Current Loop Filter Configuration

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LMX2595 EVM Instructions – 19-GHz Wideband Low Noise PLL With

Integrated VCO

4 Current Loop Filter Configuration

The parameters for the loop filters are:

Table 2. Current Loop Filter Configuration

PARAMETER VALUE

VCO Gain 132 MHz/V

Loop Bandwidth 285 kHz

Phase Margin 65 deg

C1_LF 390 pF

C2_LF 68 nF

C3_LF Open

C4_LF 1800 pF

R2 68 Ω

R3_LF 0 Ω

R4_LF 18 Ω

Effective Charge Pump Gain 15 mA

Phase Detector Frequency (MHz) 200 MHz

VCO Frequency Designed for 15 GHz, but works

over the whole frequency range

Figure 10. Current Loop Filter Configuration

For detailed design and simulation, see the PLLatinum Sim Tool.

For application notes, blogs,or videos on our products, see http://www.ti.com/pll.

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