Texas Instruments DAC7731 User Manual
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Texas Instruments DAC7731 User Manual

Texas Instruments DAC7731 User Manual

Evaluation module
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DAC7731 Evaluation Module
User's Guide
March 2003
DAP EVMs
SLAU099

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Summary of Contents for Texas Instruments DAC7731

  • Page 1 DAC7731 Evaluation Module User’s Guide March 2003 DAP EVMs SLAU099...
  • Page 2 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.
  • Page 3 EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
  • Page 4 EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright  2003, Texas Instruments Incorporated...
  • Page 5 About This Manua This user’s guide describes the characteristics, operation, and use of the DAC7731 evaluation module. It covers all pertinent areas involved in properly using this EVM board along with the devices that it supports. The physical PCB layout, schematic diagram, and circuit descriptions are included.
  • Page 6 REF102 SBCS022 OPA627 SBOS165 Questions about this or other Data Converter EVM’s? If you have questions about this or other Texas Instruments Data Converter evaluation modules, please feel free to e-mail the Data Converter Application ps@list.ti.com. Team at datac nvap Include in the subject heading the product you have questions or concerns with.

  • Page 7: Table Of Contents

    Contents Contents EVM Overview ..............Features .
  • Page 8 Contents Figures 1 - 1 EVM Block Diagram ............2 - 1 Top Silkscreen .

  • Page 9: Evm Overview

    Chapter 1 EVM Overview This chapter gives a general overview of the DAC7731 evaluation module (EVM) and describes some of the factors that must be considered when using the module. Topic Page Features ............

  • Page 10: Features

    Features 1.1 Features This EVM features the DAC7731 digital - to - analog converter. The DAC7731EVM is a simple evaluation module designed for a quick and easy way to evaluate the functionality and performance of the high resolution, single-channel, and serial input DAC. This EVM features a serial interface to communicate with any host microprocessor or TI DSP (with SPI capability) base system.

  • Page 11: Evm Basic Functions

    The on-chip reference buffer output is channeled out through V REF pin, which is used to set up the DAC7731 output amplifier into one of three voltage output modes (refer to the data sheet). V REF can also be used to drive other system components that require external voltage reference.

  • Page 12: Evm Block Diagram

    Shorting pins 1 and 2 of W13 allows the user to monitor the raw output of the DAC7731. The J4 header is also used to monitor the output signal through the external op amp for cascading or daisy-chaining up to three DAC7731 EVMs.

  • Page 13: Pcb Design And Performance

    Chapter 2 PCB Design and Performance The layout design of the PCB, describing the physical and mechanical characteristics of the EVM, is presented in this chapter. This section also shows the resulting performance of the EVM, which can be compared to the device specification listed in the data sheet.

  • Page 14: Pcb Layout

    PCB Layout 2.1 PCB Layout The DAC7731 EVM is designed to preserve the performance quality of the DAC under test, as specified in the data sheet. Carefully analyzing the EVM physical restrictions and knowing the elements that contribute to the EVM performance degradation are keys to a successful design implementation.

  • Page 15: Top Silkscreen

    PCB Layout Figure 2 - 1. Top Silkscreen Figure 2 - 2. Layer 1 (Top Signal Plane) Figure 2 - 3. Layer 2 (Ground Plane) PCB Design and Performance...

  • Page 16: Bottom Silkscreen

    PCB Layout Figure 2 - 4. Layer 3 (Power Plane) Figure 2 - 5. Layer 4 (Bottom Signal Plane) Figure 2 - 6. Bottom Silkscreen...

  • Page 17: Drill Drawing

    PCB Layout Figure 2 - 7. Drill Drawing Notes: 1) PWB to be fabricated to meet or exceed IPC-6012, Class 3 standards and workmanship shall conform to IPC-A-600, Class 3—Current revisions 2) Board material and construction to be UL approved and marked on the finished board. 3) Laminate material: Copper-clad FR-4 4) Copper weight: 1 oz.

  • Page 18: Evm Performance

    INL and DNL results and is shown in Figure 2 - 9. The parameters and results of the DAC7731 EVM characterization test can be seen in Figure 2 - 8 and Figure 2 - 9.

  • Page 19: Inl And Dnl Characterization Graphs

    EVM Performance Figure 2 - 9. INL and DNL Characterization Graphs PCB Design and Performance...

  • Page 20: Bill Of Materials

    Samtec TSM-110-01-S-DV-M 10X2X.1, 20 Pin .025”sq SMT socket J1 J3 On-Shore ED555/3DS 3-Pin terminal connector Technology Texas Instruments DAC7731 16-bit, voltage output, serial input DAC, SSOP-24 Texas Instruments OPA627AU 8-SOP(D) precision op amp Texas Instruments REF102AU +10 V , 8-SOP(D) precision...

  • Page 21: Evm Operation

    DAC. It describes how to interface the EVM to a specific host processor. Refer to the DAC7731 data sheet SBAS249 for information about its serial interface and other related topics. The EVM board is factory tested and configured to operate in the bipolar output mode.

  • Page 22: Factory Default Settings

    Factory Default Settings 3.1 Factory Default Settings Factory default jumper settings for the EVM board are shown in Table 3 - 1. These settings allow the EVM to operate in bipolar, ±10 V mode of operation using the internal voltage reference. Table 3 - 1.

  • Page 23: Host Processor Operation

    U2 easily by shorting the respective pins of W13. In addition, it provides easy access for monitoring up to three DAC7731 EVMs in daisy chain or cascading fashion with the option of using U2 for each of the EVMs stacked together.

  • Page 24: Output Gain Of Two

    Output Gain of Two This configuration allows the DAC output with a gain of two, but is limited to the effective rails of the operational amplifier. When the DAC7731 is configured to operate in bipolar mode, the DAC output must be within the range of 12 V or less.

  • Page 25: Jumper Setting

    Jumper Setting 3.3 Jumper Setting Table 3 - 5 shows the function of each jumper on the EVM. Table 3 - 5. Jumper Setting Functions Reference Setting Function is strapped to V to set V (summing junction) to V /2. Refer to the OFFSET data sheet for offset adjustment.

  • Page 26: Schematic

    Reference Setting Function Routes the raw output of the DAC7731 to J4 - 2 output terminal. Routes the output of U2 to J4- 6 output terminal. Used for unipolar and bipolar modes of operation. Routes the output of U2 to J4 - 10 output terminal. Used for capacitive load driving.

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