Texas Instruments LMX2492 User Manual
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Texas Instruments LMX2492 User Manual

Ultra low noise frequency synthesizer with integrated vco evaluation board
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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

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Summary of Contents for Texas Instruments LMX2492

  • Page 1 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...

  • Page 2: Table Of Contents

    ......................Board Layers Stackup ........................Bill of Materials ..................Typical Performance Measurements ......................PLL Phase Noise ......................Ramping Example .......................... Revision History Contents SNAU160C – March 2014 – Revised November 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
  • Page 3 User's Guide SNAU160C – March 2014 – Revised November 2014 Evaluation Board Operating Instructions SNAU160C – March 2014 – Revised November 2014 Evaluation Board Operating Instructions Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 4: Evaluation Board Setup

    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.

  • Page 5: Evaluation Board Configuration

    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 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 6: Codeloader Software Settings

    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 Evaluation Board Configuration SNAU160C –...

  • Page 7: Device Selection

    CodeLoader Software Settings www.ti.com 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 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 8: Bits/Pins Tab And Restoring The Default Configuration

    To restore the part to the original software configuration, on can select the default mode as shown. Figure 2-3. Restoring Default Mode Evaluation Board Configuration SNAU160C – March 2014 – Revised November 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 9: Registers Tab

    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.

  • Page 10: Pll Frequency Tab

    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 Evaluation Board Configuration SNAU160C – March 2014 – Revised November 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 11: Ramp Generator Tab

    Only modify values in "Yellow" regions • Click and unclick “RST” to clear the accumulator after modifying a row in Ramps SNAU160C – March 2014 – Revised November 2014 Evaluation Board Configuration Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 12: Schematic

    SNAU160C – March 2014 – Revised November 2014 Schematic Refer to Chapter 5 for actual component values. Also realize that not all components are placed on this board. Schematic SNAU160C – March 2014 – Revised November 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 13: Board Layers Stackup

    LMX2492.GTL Top Layer LMX2492.GP1 GND Plane LMX2492.G1 Power LMX2492.GBL Bottom Layer Top Copper - 1oz thick [LMX2492.GTL] Ro4003 (Er=3.38) CONTROLLED THICKNESS OF 16 MILS THICK GND Layer [LMX2492.GP1] FR4 (Er = ~4.6) 18 MILS THICK Power Layer [LMX2492.G1] FR4 (Er = ~4.6) 22 MILS THICK Bottom Copper - Thermal Relief [LMX2492.GBL]...

  • Page 14: Bill Of Materials

    RES, 10 ohm, 5%, 0.1W, 0603 Vishay-Dale CRCW060310R0JNEA R56, R58, R61, R64, R65, R70, RES, 12k ohm, 5%, 0.1W, 0603 Vishay-Dale CRCW060312K0JNEA Bill of Materials SNAU160C – March 2014 – Revised November 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
  • Page 15 Texas Instruments LP5900SD-3.3 Requires No Bypass Capacitor, 6-pin LLP uWire Connector 52601-G10-8LF OSC 100.0000MHZ 3.3V +- Connor-Winfield CWX813-100.0M 25PPM SMD SNAU160C – March 2014 – Revised November 2014 Bill of Materials Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 16: Typical Performance Measurements

    The above figure shows the phase noise in default for mode. Note that this is ½ the VCO frequency as it was observed on the Fout/2 output. Typical Performance Measurements SNAU160C – March 2014 – Revised November 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
  • Page 17 At about 260 kHz, the phase noise is -113.1 dBc/Hz, which is actually being degraded by 0.5 dB by the 1/f noise. This implies a figure of merit of -227.2 dBc/Hz. SNAU160C – March 2014 – Revised November 2014 Typical Performance Measurements Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
  • Page 18 -170 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 Offset (Hz) The phase noise of the LMX2492 does vary somewhat with tuning voltage with the best performance typically near lower tuning voltages. Table 6-1. Phase Noise FVCO Vtune 9000 0.04 9100 0.18 9200 0.338...

  • Page 19: Ramping Example

    Below is an example that can be used to generate the waveform shown later in this document. Figure 6-4. Setup for Ramping Example Figure 6-5. Generated Waveform at VCO/2 Output SNAU160C – March 2014 – Revised November 2014 Typical Performance Measurements Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 20: Revision History

    Changes from B Revision (October 2014) to C Revision ....................Page ..........• Changed Updated Schematic *Again* due to curruption. Now using a GIF format. Revision History SNAU160C – March 2014 – Revised November 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
  • Page 21 STANDARD TERMS AND CONDITIONS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, or documentation (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms and conditions set forth herein. Acceptance of the EVM is expressly subject to the following terms and conditions.
  • Page 22 FCC Interference Statement for Class B EVM devices NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
  • Page 23 【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 本開発キットは技術基準適合証明を受けておりません。 本製品のご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。 1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用 いただく。 2. 実験局の免許を取得後ご使用いただく。 3. 技術基準適合証明を取得後ご使用いただく。 なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。 上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。 日本テキサス・インスツルメンツ株式会社 東京都新宿区西新宿６丁目２４番１号 西新宿三井ビル 3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page 電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧くださ い。http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page SPACER EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS.
  • Page 24 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2014, Texas Instruments Incorporated...
  • Page 25 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue.
  • Page 26 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments LMX2492EVM...

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