Texas Instruments SC70 DAC EVM User Manual
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Texas Instruments SC70 DAC EVM User Manual

Texas Instruments SC70 DAC EVM User Manual

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This document describes the setup and operation of the SC70 DAC Evaluation Module (EVM). It also
discusses the DAC eXerciser Program, a software tool used with the SC70 DAC EVM. Included are the
EVM schematic, bill of materials, and board layout.
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DAC Output Update Options
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Analog Interface
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EVM Overview
SLAU299 - November 2009
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Copyright © 2009, Texas Instruments Incorporated
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User's Guide
SLAU299 - November 2009
SC70 DAC EVM
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Summary of Contents for Texas Instruments SC70 DAC EVM

  • Page 1: Table Of Contents

    This document describes the setup and operation of the SC70 DAC Evaluation Module (EVM). It also discusses the DAC eXerciser Program, a software tool used with the SC70 DAC EVM. Included are the EVM schematic, bill of materials, and board layout.

  • Page 2: Features

    The modular EVM form factor allows for direct evaluation of the DAC's performance and operating characteristics. This EVM is compatible with the 5-6K Interface Board (SLAU104) from Texas Instruments as well as the HPA-MCU Interface Board (SLAU106). As part of a SC70 DACEVM-PDK kit, this EVM is supported on the DXP Platform using the modular motherboard MMB0.

  • Page 3: Digital Interface

    J1.18 Power Supplies The SC70 DAC EVM board requires a single, +5-VDC power supply for proper operation. This 5-V supply powers the voltage reference (U2) and the external reference buffer (U3). When used in combination with one of the DAP interface boards, J3 provides connection to the common power bus described in document SLAA185.

  • Page 4: Stand-Alone Operation

    Moving the shunt on JP3 to cover pins 2-3 applies the analog output to J2 pin 10. Digital Control The digital control signals can be applied directly to J1 (top or bottom side). The SC70 DAC EVM can also be connected directly to a DSP or microcontroller capable of supplying the necessary serial control inputs.

  • Page 5: Hardware

    TI Web site. This section covers the specific operation of the SC70 DAC EVM-PDK. Hardware The hardware consists of two main components: the first is the SC70 DAC EVM itself and the other is a modular motherboard called the MMB0. The MMB0 board houses a TMS320VC5507 DSP which controls the serial interface to the device loaded on the EVM board.

  • Page 6: Mmb0 Power Supplies

    J14 on the MMB0 (referenced to the GND terminal). For convenience to the SC70 DAC EVM user, the +5VA required for the analog power to the EVM may be provided through the MMB0. This can be accomplished by placing a shunt jumper on J13B (+5 to +5VA), which connects the digital 5-V supply to the analog supply input.

  • Page 7: Loading A Sc70 Dac Evm Configuration

    Using the SC70 DAC EVM With DXP www.ti.com Figure 2. Loading a SC70 DAC EVM Configuration The DXP software defaults to output a 1-kHz sine wave from the DAC; other waveform options include Square, Saw tooth, Triangle, and DC output options as described in the DXP User's Guide. The frequency and amplitude of the output waveform is controlled by sliders on the DXP interface.

  • Page 8: Dac Output Update Options

    Using the SC70 DAC EVM With DXP www.ti.com Figure 3. SC70 DAC EVM – Frequency/Amplitude and Update Rate Adjustments DAC Output Update Options The DXP software also allows the user to choose several DAC output update options. These are shown in Figure Figure 4.

  • Page 9: Bill Of Materials And Evm Schematic

    The DXP software defaults to Frame Sync update mode. In this mode, the SYNC input of the DAC loaded on the EVM is controlled by the Frame Sync output of the MMB0. JP1 on the SC70 DAC EVM must be shorted pins 1-2 to use this option.

  • Page 10: Related Documentation From Texas Instruments

    Revision History ECN Number Approved +5VA REF5040ID +5VA TRIM TEMP OPA353 AVdd 0.1uF 0.47 F 0.1uF 10uF /SYNC AVDD/VREF SYNC OUT_A1 OUT_A SCLK CLKX Vout SCLK CLKR OUT_A2 11 12 13 14 11 12 15 16 13 14 DAC8411 17 18 15 16 +REFin DAC8311...
  • Page 11 Related Documentation from Texas Instruments To obtain a copy of any of the following TI documents, call the Texas Instruments Literature Response Center at (800) 477-8924 or the Product Information Center (PIC) at (972) 644-5580. When ordering, identify this booklet by its title and literature number. Updated documents can also be obtained through the TI Web site at www.ti.com...
  • Page 12 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 13 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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