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User's Guide

SLAU299–November 2009

SC70 DAC EVM

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.

Contents

1 EVM Overview ............................................................................................................... 1

1.1 Features ............................................................................................................. 2

1.2 Introduction ......................................................................................................... 2

2 Analog Interface ............................................................................................................. 2

3 Digital Interface .............................................................................................................. 3

4 Power Supplies .............................................................................................................. 3

4.1 DAC Power ......................................................................................................... 3

4.2 Stand-Alone Operation ............................................................................................ 4

5 EVM Operation .............................................................................................................. 4

5.1 Analog Output ...................................................................................................... 4

5.2 Digital Control ...................................................................................................... 4

5.3 SYNC ................................................................................................................ 4

5.4 Default Jumper Locations ......................................................................................... 4

6 Using the SC70 DAC EVM With DXP .................................................................................... 4

6.1 Hardware ............................................................................................................ 5

6.2 MMB0 Power Supplies ............................................................................................ 6

6.3 Software – Running DXP ......................................................................................... 6

6.4 DAC Output Update Options ..................................................................................... 8

7 Bill of Materials and EVM Schematic ..................................................................................... 9

7.1 Bill of Materials ..................................................................................................... 9

7.2 EVM Schematic .................................................................................................... 9

8 Related Documentation from Texas Instruments ..................................................................... 10

List of Figures

1 MMB0 With SC70 DACEVM Installed (NEEDS REPLACING) ....................................................... 6

2 Loading a SC70 DAC EVM Configuration ............................................................................... 7

3 SC70 DAC EVM – Frequency/Amplitude and Update Rate Adjustments ........................................... 8

4 DAC Output Update Options .............................................................................................. 8

List of Tables

1 Analog Interface............................................................................................................. 2

2 Digital Control ............................................................................................................... 3

3 J3 Power Input .............................................................................................................. 3

4 EVM Default Jumper Settings ............................................................................................. 4

5 Output Update Features ................................................................................................... 9

1 EVM Overview

SLAU299–November 2009 SC70 DAC EVM

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Summary of content (13 pages)

PAGE 1
User's Guide SLAU299 – November 2009 SC70 DAC EVM 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. 1 2 3 4 5 6 7 8 Contents EVM Overview ............................................................................................................... 1 1.1 Features ..........................................
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Analog Interface 1.1 Features • • • • 1.2 www.ti.
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Digital Interface www.ti.com 3 Digital Interface The SC70 DAC EVM is designed for easy interfacing to multiple control platforms. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket combination at J1. This header/socket provides access to the digital control and serial data pins of the SC70 DAC EVM. Consult Samtec at www.samtec.com or 1-800-SAMTEC-9 for a variety of mating connector options. Table 2. Digital Control Pin Number Signal J1.
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EVM Operation 4.2 www.ti.com Stand-Alone Operation When used as a stand-alone EVM, the analog power can be applied directly to J3 pin 3 referenced to pin 5. Optimal performance of the EVM requires a clean, well-regulated power source. CAUTION The DACs that are compatible with this EVM have a variety of power supply requirements. Check the appropriate data sheets, and verify all power supplies are within the safe operating limits of the converter before applying power to the EVM. 5 EVM Operation 5.
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Using the SC70 DAC EVM With DXP www.ti.com DXP is a program for controlling the digital input signals such as the clock, SYNC, and SDI. Wave tables are built into the DSP software to allow Sine, Ramp, Triangle, and Square wave signals to be generated by the SC70 DAC. Straight DC outputs can also be obtained. The SC70 DAC EVM-PDK is controlled by loading a DAC EVM configuration into the MMB0.
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Using the SC70 DAC EVM With DXP 6.2 www.ti.com MMB0 Power Supplies Several power connections are required for the hardware to work properly. For the MMB0, the supplied 6-V AC/DC converter is all that is necessary. Ensure that J12 on the MMB0 board is closed before connecting the AC/DC adapter to the DC In connector of the MMB0. This supply provides all power to the digital portion of the SC70 DAC EVM as well as all necessary power for the DSP.
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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. The DAC update rate can also be modified as shown in Figure 3.
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Using the SC70 DAC EVM With DXP www.ti.com Figure 3. SC70 DAC EVM – Frequency/Amplitude and Update Rate Adjustments 6.4 DAC Output Update Options The DXP software also allows the user to choose several DAC output update options. These are shown in Figure 4. Figure 4. DAC Output Update Options Details on these options are shown in Table 5.
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Bill of Materials and EVM Schematic www.ti.com Table 5. Output Update Features Options Detailed Description Frame Sync 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.
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1 2 3 4 6 5 Revision History REV ECN Number Approved D D +5VA R3 NI C4 1uF R1 R4 NI 5 NI U3 R2 1 U2 REF5040ID JP2 10K 6 3 1 4 C7 TP1 OPA353 OUT TRIM TEMP V+ NC NC NC GND 3 2 AVdd +5VA 5 2 8 7 1uF C5 C3 0.1uF 0.47µF 4 C1 C2 C6 0.
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Related Documentation from Texas Instruments 8 www.ti.com 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 EVM-Compatible Device Data Sheets: 1. DAC5311, DAC6311, DAC7311, 1.
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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.
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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.