Texas Instruments DAC5688 User Manual
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Texas Instruments DAC5688 User Manual

Texas Instruments DAC5688 User Manual

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This user's guide document gives a general overview of the DAC5688 evaluation module (EVM) and
provides a general description of the features and functions to be considered when using this module.
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SLAU241 - June 2008
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List of Figures
User's Guide
SLAU241 - June 2008
DAC5688EVM
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  • Page 1: Table Of Contents

    User's Guide SLAU241 – June 2008 DAC5688EVM This user's guide document gives a general overview of the DAC5688 evaluation module (EVM) and provides a general description of the features and functions to be considered when using this module. Contents ........................

  • Page 2: Contents 1 Overview

    DAC5688 device, the EVM allows an external reference to be provided to the DAC. The DAC5688EVM allows the user to program the DAC5688 and CDCM7005 registers through a USB port. The interface allows read and write access to all the DAC5688 registers and write-only access to the CDCM7005 registers.

  • Page 3: Minimum Requirements

    Double-click the setup.exe file located on the installation CD. The DAC5688 Installation Wizard opens. Figure 1. DAC5688EVM Install Screen Installing the DAC5688EVM Instrument Drivers As part of the DAC5688 Wizard, the EVM instrument drivers are installed automatically. Because the USB device driver is unsigned by Windows, the warning in Figure 2 appears.

  • Page 4: Installing The Dac5688Evm Hardware

    Software Installation www.ti.com Figure 2. Windows USB Driver Warning To finalize the installation, the DAC5688 Wizard asks the user to restart the computer. The system must be rebooted prior to running the software. Installing the DAC5688EVM Hardware After installing the DAC5688EVM control software and drivers, connect the DAC5688EVM to a spare USB port of the host PC.

  • Page 5: Dac5688Evm Description

    The DAC5688EVM provides a robust and flexible evaluation system for the 16-bit, 800-MSPS DAC5688 DAC. In addition to the DAC5688, the EVM includes a CDCM7005 for clock distribution and a TRF3703 analog quadrature modulator path for RF measurements. For a complete hardware description, consult the schematics and layout sections at the end of this guide.

  • Page 6: Dac5688 Hardware Description

    IF directly up to RF-based on the LO frequency. DAC5688 Hardware Description The DAC5688 can be set up in a variety of configurations to accommodate a specific mode of operation. Before starting evaluation, the user should decide on the configuration and make the appropriate connections or changes.

  • Page 7: Input/Output Connectors

    USB Interface The DAC5688EVM contains a USB connector to interface to a USB 1.1 or later compliant USB port. Programming of the CDCM7005 and DAC5688 is accomplished through this port. Power Management The DAC5682zEVM requires 1.8-V and 3.3-V supplies for normal operation. An additional 5-V supply is required to power up the TRF3073 for RF measurements.

  • Page 8: Input Data

    J2 and J7 per Table 3 Table 4. The board provides series dampening resistors to minimize digital ringing and switching noise. The DAC5688 logic level is selected through software. Table 3. Input Data Connector J2 – Data A Bus Description Description...

  • Page 9: Pll Mode

    In both CDCM7005 configurations, the Y1A/Y1B outputs are used to drive the DAC5688 CLK2/CLK2C inputs. The DAC5688 can also be operated in dual-clock mode, in which case a second clock needs to be provided to the device. This clock may be single ended (CLK1) or differential (CLK1/CLK1C). The CDCM7005 Y2A/Y2B outputs may be used to provide this clock.
  • Page 10 The factory-set configuration of the EVM provides the user with single-ended DAC output signals at SMA connectors J4 and J9. The DAC5688 outputs are configured to drive a doubly terminated 50-Ω cable using a 4:1 impedance ratio transformer with the center tap of the transformers connected to +3.3 VA.

  • Page 11: Reference Operation

    In its default state, the pad is not used and a series capacitor is used on the RF output. Reference Operation The DAC5688 full-scale output current is set by applying an external resistor (R91) between the BIASJ pin of the device and ground. The full-scale output current can be adjusted from 20 mA down to 2 mA by varying this resistor.

  • Page 12: Software Main Settings

    Begins a new USB session. Click this button if a status error message occurs. Readback Enabled/Disabled: Enable or disables the DAC5688 register reads. When Readback is disabled, the software enters simulation mode. If communicating with the DAC5688 is a problem, the software enters into simulation mode automatically. Save Settings: Saves the DAC5688 and CDCM7005 register configurations to a text file for future use.
  • Page 13 Read All: Reads the current registers on the DAC5688. This is used to verify settings on the front panel. FDAC(MHz): Enters the DAC frequency in MHz for NCO calculation.

  • Page 14: Dac5688Evm Initial Power Up And Test

    3.3-V or 1.8-V CMOS logic level inputs such as Texas Instruments TSW3100. 2. Use the DAC5688 EVM DAC_CLKOUT (J21) SMA connector to trigger the pattern generator. In the case of the TSW3100 pattern generator, the trigger input is CMOS CLK (J73) SMA connector.

  • Page 15: Bill Of Materials And Schematics

    Bill of Materials and Schematics www.ti.com example.txt is included under the installation folder: C:\Program Files\Texas Instruments\DAC5688\DAC5688 Configuration Files\ 9. Program and run the pattern generator. If using the TSW3100, see the user’s guide for more information on how to set up a digital pattern.
  • Page 16 Bill of Materials and Schematics www.ti.com Part Value PCB Footprint Mfr_Name Mfr_Part_Number Note Reference C105 C106 47pF 0603 Panasonic ECJ-1VC1H470J D1-D4 LED Green LED_0805 Panasonic LNJ306G5UUX D5-D7 MBRB2515L DIODE_MBRB2515L Semiconductor MBRB2515LT4G 68 Ω at 100MHz FB1-FB12 1206 Panasonic EXC-ML32A680U Header_1x2_100_230L HDR_THVT_1x2_100_M Samtec TSW-103-07-L-S...
  • Page 17 TFMR_6_250x340_100_cust Mini-Circuits ADT4-1T TP1 TP2 TP4 TP_THVT_100_RND Keystone 5001 TP6 TP8 TP10 Electronics Corp. TP3 TP5 TP7 Testloop_Red TP_THVT_060_RND Keystone 5000 Electronics Corp. DAC5688 QFN_64_360x360_0p50mm Texas DAC5688RGC _pwrpad Instruments U2 U8 SN74LVC1G125DBVR SOT_5_120x69_57 Texas SN74LVC1G125DBVR Instruments 614.4MHZ VCXO_6_CUSTOM Toyocom TCO-2111-491.52_DNI DNI...

  • Page 18: Printed-Circuit Board Layout

    Bill of Materials and Schematics www.ti.com Printed-Circuit Board Layout The following illustrations present the layers of the DAC5688EVM board. Figure 6. Top Silk Screen DAC5688EVM SLAU241 – June 2008 Submit Documentation Feedback...

  • Page 19: Layer 2, Gnd

    Bill of Materials and Schematics www.ti.com Figure 7. Layer 2, GND SLAU241 – June 2008 DAC5688EVM Submit Documentation Feedback...

  • Page 20: Layer 3, Gnd

    Bill of Materials and Schematics www.ti.com Figure 8. Layer 3, GND DAC5688EVM SLAU241 – June 2008 Submit Documentation Feedback...

  • Page 21: Layer 4, Pwr

    Bill of Materials and Schematics www.ti.com Figure 9. Layer 4, PWR SLAU241 – June 2008 DAC5688EVM Submit Documentation Feedback...

  • Page 22: Layer

    Bill of Materials and Schematics www.ti.com Figure 10. Layer 5 DAC5688EVM SLAU241 – June 2008 Submit Documentation Feedback...

  • Page 23: Layer 6, Pwr

    Bill of Materials and Schematics www.ti.com Figure 11. Layer 6, PWR SLAU241 – June 2008 DAC5688EVM Submit Documentation Feedback...

  • Page 24: Layer 7, Gnd

    Bill of Materials and Schematics www.ti.com Figure 12. Layer 7, GND DAC5688EVM SLAU241 – June 2008 Submit Documentation Feedback...

  • Page 25: Bottom Silk Screen

    Bill of Materials and Schematics www.ti.com Figure 13. Bottom Silk Screen SLAU241 – June 2008 DAC5688EVM Submit Documentation Feedback...

  • Page 26: Schematics

    Bill of Materials and Schematics www.ti.com Schematics The DAC5688EVM schematics appear on the following pages. DAC5688EVM SLAU241 – June 2008 Submit Documentation Feedback...
  • Page 27 .1uF .1uF 10uF 10uF .1uF .1uF 10uF 10uF (SHUNT 2-3) (SHUNT 2-3) Title Title Title DAC5688 EVM DAC5688 EVM DAC5688 EVM Size Size Size Document Number Document Number Document Number Date: Date: Date: Friday, December 21, 2007 Friday, December 21, 2007...
  • Page 28 DB13 DB_14 DB14 DB_15 DB15 4816P-001-220 4816P-001-220 TX_ENABLE SH1 22.1 22.1 Title Title Title DAC5688 EVM DAC5688 EVM DAC5688 EVM Size Size Size Document Number Document Number Document Number Date: Date: Date: Thursday, September 13, 2007 Thursday, September 13, 2007...
  • Page 29 90.9 10nH 10nH SH1,7 IOUTA2 68nH 68nH 60.4 60.4 4.7pF 4.7pF Title Title Title DAC5688 EVM DAC5688 EVM DAC5688 EVM Size Size Size Document Number Document Number Document Number Date: Date: Date: Friday, December 21, 2007 Friday, December 21, 2007...
  • Page 30 .001uF .01uF .01uF .1uF .1uF .1uF .1uF .1uF .1uF 10uF 10uF Title Title Title DAC5688 EVM DAC5688 EVM DAC5688 EVM Size Size Size Document Number Document Number Document Number Date: Date: Date: Thursday, September 13, 2007 Thursday, September 13, 2007...
  • Page 31 R111 SDENB SH1 R107 R107 CTRL_DATA SH4 R105 R105 CTRL_LE SH4 SN74AHC541PW SN74AHC541PW Title Title Title DAC5688 EVM DAC5688 EVM DAC5688 EVM Size Size Size Document Number Document Number Document Number Date: Date: Date: Thursday, September 13, 2007 Thursday, September 13, 2007...
  • Page 32 .01uF .01uF +3.3V_LOGIC 68 OHM @ 100MHz 68 OHM @ 100MHz 47uF 47uF .01uF .01uF Title Title Title DAC5688 EVM DAC5688 EVM DAC5688 EVM Size Size Size Document Number Document Number Document Number Date: Date: Date: Thursday, September 13, 2007...
  • Page 33 SCREW PANHEAD 4-40 x 3/8 SCREW PANHEAD 4-40 x 3/8 SCREW PANHEAD 4-40 x 3/8 SCREW PANHEAD 4-40 x 3/8 SCREW PANHEAD 4-40 x 3/8 Title Title Title DAC5688 EVM DAC5688 EVM DAC5688 EVM x_STANDOFF1 x_STANDOFF1 x_STANDOFF2 x_STANDOFF2 x_STANDOFF3 x_STANDOFF3...

  • Page 34: Evaluation Board/Kit Important Notice

    EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.

  • Page 35: Important Notice

    IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.

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