Texas Instruments LMX2492 Manuale utente

LMX2492 Evaluation Instructions

Ultra Low Noise Frequency Synthesizer with

Integrated VCO Evaluation Board Operating

Instructions

User's Guide

Literature Number: SNAU160C

March 2014–Revised November 2014

Contents

1 Evaluation Board Setup ........................................................................................................ 4

1.1 Evaluation Board Setup Diagram and Connections..................................................................... 4

1.1.1 VCO Outputs ........................................................................................................ 4

1.1.2 VCC 5V .............................................................................................................. 4

1.1.3 VCC 3P3V ........................................................................................................... 4

1.1.4 USB2ANY Connector .............................................................................................. 4

1.1.5 OSCin/OSCin*....................................................................................................... 4

2 Evaluation Board Configuration............................................................................................. 5

2.1 Loop Filter Configuration.................................................................................................... 5

2.2 CodeLoader Software Settings ............................................................................................ 6

2.2.1 Port Setup ........................................................................................................... 6

2.2.2 Device Selection .................................................................................................... 7

2.2.3 Bits/Pins Tab and Restoring the Default Configuration........................................................ 8

2.2.4 Registers Tab ....................................................................................................... 9

2.2.5 PLL Frequency Tab............................................................................................... 10

2.2.6 Ramp Generator Tab ............................................................................................. 11

3 Schematic ......................................................................................................................... 12

4 Board Layers Stackup......................................................................................................... 13

5 Bill of Materials .................................................................................................................. 14

6 Typical Performance Measurements..................................................................................... 16

6.1 PLL Phase Noise........................................................................................................... 16

6.2 Ramping Example.......................................................................................................... 19

Revision History.......................................................................................................................... 20

2Contents SNAU160C–March 2014–Revised November 2014

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User's Guide

SNAU160C–March 2014–Revised November 2014

Evaluation Board Operating Instructions

SNAU160C–March 2014–Revised November 2014 Evaluation Board Operating Instructions

Direct VCO Output (~10 GHz)

VCO/2 Output (~5 GHz) 5V Supply

Optional:

3V Supply

Optional:

VCO/4 Output

Optional:

Single Ended or

Differential

Reference Signal

USB2ANY

Connector

Chapter 1

SNAU160C–March 2014–Revised November 2014

Evaluation Board Setup

1.1 Evaluation Board Setup Diagram and Connections

Figure 1-1. Evaluation Board Connection Diagram

1.1.1 VCO Outputs

The LMX2492 operates at 10 GHz, but this can be a problem for some test equipment. If it is, use the

VCO/2 output or the VCO/4 output. The VCO/4 output is powered down by default, but can be configured

if necessary.

1.1.2 VCC 5V

The board operates on 5V and regulates this down to 3.3 V for the PLL. The board can be configured to

operate wit separate

1.1.3 VCC 3P3V

This is actually supplied from the regular off the 5V supply, but can also be run from a 3.3 V supply if the

regulator is disconnected and a few resistors are changed.

1.1.4 USB2ANY Connector

Connect the board to the computer using the USB2ANY connector, which comes supplied with the kit.

1.1.5 OSCin/OSCin*

The board has an on board XO, but the OSCin pins can be run either single-ended or differentially.

4Evaluation Board Setup SNAU160C–March 2014–Revised November 2014

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Chapter 2

SNAU160C–March 2014–Revised November 2014

Evaluation Board Configuration

2.1 Loop Filter Configuration

Table 2-1. Loop Filter Values

PARAMETER LMX2492

VCO Frequency 9.4 – 10.1 GHz

VCO Gain (MHz/V) 200 MHz/V

C1_LF 68 pF

C2_LF 3.9 nF

C3_LF 150 pF

C4_LF Open

R2 390 Ω

R3_LF 150 Ω

R4_LF 0 Ω

Charge Pump Gain 3.1 mA

Phase Detector Frequency 100 MHz

OSCin Frequency 100 MHz

SNAU160C–March 2014–Revised November 2014 Evaluation Board Configuration

CodeLoader Software Settings

www.ti.com

2.2 CodeLoader Software Settings

The CodeLoader software is used for programming this device and is available at www.ti.com/codeloader.

2.2.1 Port Setup

The port setup shows which pins are sent to the pins of the header. If using the USB2ANY board, it is

recommended to click the "Identify" button and ensure the LED light is blinking to ensure that this is

working correctly. Note that position 3 is MUXout, which can be used for readback. In order to do this, the

MUXout pin needs to be programmed to Readback and also resistor R68 needs to be placed.

Figure 2-1. LMX2492 Port Setup

6Evaluation Board Configuration SNAU160C–March 2014–Revised November 2014

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CodeLoader Software Settings

2.2.2 Device Selection

Go to “Select Device” →“PLL–Fractional” →LMX2492

Figure 2-2. Part Selection

SNAU160C–March 2014–Revised November 2014 Evaluation Board Configuration

CodeLoader Software Settings

www.ti.com

2.2.3 Bits/Pins Tab and Restoring the Default Configuration

The Bits/Pins tab shows the state of the programming fields. Note the scroll bar at the bottom. One can

right mouse click on any field for a short description of what it does. To restore the part to the original

software configuration, on can select the default mode as shown.

Figure 2-3. Restoring Default Mode

8Evaluation Board Configuration SNAU160C–March 2014–Revised November 2014

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CodeLoader Software Settings

2.2.4 Registers Tab

The registers tab is not necessary to program the part, but it does show the regsiters. The LMX2492 also

supports readback. To use this, set the MUXout pin to readback and attach resistor R68 to connect this

pin back to the programming header. Once this is done entire registers can be read, or a specific field can

be typed in to read the value. Realize that some fields of the LMX2492 are read only and therefore might

not be the same as written to.

Figure 2-4. Registers Tab

SNAU160C–March 2014–Revised November 2014 Evaluation Board Configuration

CodeLoader Software Settings

www.ti.com

2.2.5 PLL Frequency Tab

Verify your “PLL” Tab looks like below:

Figure 2-5. PLL Frequency Tab

10 Evaluation Board Configuration SNAU160C–March 2014–Revised November 2014

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