Texas Instruments DAC81408EVM Manuel utilisateur

SLAU778A–June 2018–Revised December 2018

DAC81408EVM

User's Guide

SLAU778A–June 2018–Revised December 2018

DAC81408EVM

This user's guide describes the characteristics, operation, and use of the DAC81408 evaluation module

(EVM). This document also discusses the proper setup and configuration of both software and hardware,

and reviews various aspects of program operation. Throughout this document, the terms evaluation board,

evaluation module, and EVM are synonymous with the DAC81408EVM. A complete circuit description,

schematic diagram, and bill of materials are also included in this document.

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DAC81408EVM

Contents

1 Overview ..................................................................................................................... 3

2 System Setup ................................................................................................................ 4

3 Detailed Description......................................................................................................... 6

4 Schematic, PCB Layout, and Bill of Materials.......................................................................... 13

List of Figures

1 DAC81408EVM Hardware Setup.......................................................................................... 4

2 Launching Software Setup ................................................................................................. 5

3 DAC81408EVM Installation Path.......................................................................................... 5

4 DAC81408EVM Hardware Block Diagram ............................................................................... 6

5 DAC Output Header......................................................................................................... 8

6 DAC81408EVM GUI Location.............................................................................................. 9

7 DAC81408EVM GUI Connection Detection.............................................................................. 9

8 DAC81408EVM Software Page Selection .............................................................................. 10

9 Low Level Configuration Page............................................................................................ 11

10 Low Level Configuration Page Options ................................................................................. 11

11 High Level Configuration Page........................................................................................... 12

12 DAC81408EVM Board Schematic ....................................................................................... 13

13 DAC81408EVM PCB Components Layout ............................................................................. 14

14 Top Layer ................................................................................................................... 15

15 Layer 2 - Ground Plane ................................................................................................... 16

16 Layer 3 - Power Plane..................................................................................................... 17

17 Bottom Layer................................................................................................................ 18

List of Tables

1 Contents of DAC81408EVM Kit............................................................................................ 3

2 Required Components Not Included in DAC81408EVM Kit ........................................................... 3

3 Related Documentation..................................................................................................... 3

4 Power Supply Inputs ........................................................................................................ 4

5 Jumper Settings.............................................................................................................. 6

6 J8 (USB2ANY) Pin Definitions............................................................................................. 7

7 J8 SPI Signal Test Points .................................................................................................. 7

8 J1 Pin Definitions ............................................................................................................ 8

9 DAC81408 EVM Bill of Materials......................................................................................... 19

Trademarks

Windows is a trademark of Microsoft Corporation.

All other trademarks are the property of their respective owners.

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Overview

SLAU778A–June 2018–Revised December 2018

DAC81408EVM

1 Overview

The DAC81408EVM is an easy to use platform for evaluating the functionality and performance of the

DAC81408 device. The DAC81408 is a 8-channel, buffered, high-voltage output digital-to-analog converter

(DAC) in 16-bit resolution with 2.5-V internal reference. This EVM provides bipolar output voltage up to

±20 V and unipolar up to 40 V. The EVM provides the SPI programming interface using a PC-based

graphical user interface (GUI).

1.1 Kit Contents

Table 1 details the contents of the EVM kit. Contact the TI Product Information Center nearest you if any

component is missing. TI highly recommends that the user verify latest versions of the related software at

the TI website, www.ti.com.

Table 1. Contents of DAC81408EVM Kit

Item Quantity

DAC81408EVM evaluation board PCB 1

Table 2. Required Components Not Included in

DAC81408EVM Kit

Item Quantity

USB2ANY interface adapter 1

1.2 Related Documentation from Texas Instruments

The following document provides information regarding Texas Instruments integrated circuits used in the

assembly of the DAC81408EVM. This user's guide is available from the TI web site under literature

number SLAU778. Any letter appended to the literature number corresponds to the document revision that

is current at the time of the writing of this document. Newer revisions may be available from the TI web

site at http://www.ti.com/, or call the Texas Instruments Literature Response Center at (800) 477-8924 or

the Product Information Center at (972) 644-5580. When ordering, identify the document by both title and

literature number.

Table 3. Related Documentation

Document Literature Number

DAC81408 product data sheet SLASER3

Power Supply

USB2ANY

System Setup

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DAC81408EVM

2 System Setup

2.1 Hardware Setup

This section provides the overall system setup for the EVM. Use a PC to run the software that provides an

interface to the USB2ANY platform, This platform generates the optional VIO power and digital signals

used to communicate with the EVM board. Test point connections are included on the EVM board for

external power supplies. Figure 1 displays the system setup for the DAC81408EVM.

Figure 1. DAC81408EVM Hardware Setup

2.1.1 Connecting the Hardware

Connect the USB cable from the USB2ANY platform to the PC. To connect the USB2ANY to the EVM

board, align and firmly connect the keyed ribbon connector to the J8 connector. Verify that the connection

is snug because loose connections may cause intermittent operation.

2.1.2 Power Configurations

The DAC81408EVM provides electrical connections to the device supply pins. The connectors and

optional configurations are shown in the Table 4.

Table 4. Power Supply Inputs

Connector.Pin Supply Name Voltage Range

J7.3 GND 0 V

J7.4 VIO 1.7 V to 5.5 V

J7.5 VDD/VAA 4.5 V to 5.5 V

J7.6 VSS –21.5 V to 0 V

Note: 9 V < (VCC – VSS) < 43 V

J7.7 VCC 9 V to 41.5 V

J8.5 VIO 1.7 V to 5.5 V

Note: J10 selects between J7.4 and J8.5

2.1.3 Electrostatic Discharge Warning

Many of the components on the DAC81408EVM are susceptible to damage by electrostatic discharge

(ESD). Observe proper ESD handling precautions when unpacking and handling the EVM, including the

use of a grounded wrist strap at an approved ESD workstation.

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System Setup

SLAU778A–June 2018–Revised December 2018

DAC81408EVM

2.2 Software Setup

This section provides the procedure for EVM software installation.

2.2.1 Operating Systems

The EVM software is compatible with the Windows™ 7, Windows 8, and Windows 10 operating systems.

2.2.2 Software Installation

The software is available through the EVM product folder on the TI website. After the software is

downloaded to the PC, navigate to the DAC81408EVM folder, and run the Setup_DAC81408_EVM.exe

file, as shown in Figure 2. When the software is launched, an installation dialog window opens and

prompts the user to select an installation directory. If left unchanged, the software location defaults to

C:\Program Files (x86)\Texas Instruments\DAC81408 EVM, as shown in Figure 2.

Figure 2. Launching Software Setup

The software installation automatically copies the required LabVIEW files and drivers to the local machine.

Make sure to verify that the USB2ANY is not connected before the software installation, or the file and

driver installation may be affected.

Figure 3. DAC81408EVM Installation Path

DAC81408

USB2ANY

Connector

Power and

External

Reference

Input

Connector

Output

Connector

Onboard Jumper

Settings Onboard

Reference

Detailed Description

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3 Detailed Description

3.1 Hardware Description

The following sections provide detailed information on the EVM hardware and jumper configuration

settings. Table 5 displays the default configurations of all jumper connections on the DAC81408EVM.

Table 5. Jumper Settings

Jumper Default Position Available Option Description

J2 Open: RESET deactivated Closed: RESET activated RESET activation or deactivation

J3 Open: CLR deactivated Closed: CLR activated CLR activation or deactivation

J9 Closed: GND Open: external REFGND REFGND selection

J10 1-2: USB2ANY 3.3 V on J8.5 2-3: external VIO on J7.4 VIO selection

J11 1-2: VREF from REF5025 2-3: external VREF on J7.1 VREF selection note: deselect both

before selecting internal reference

J12 2-3: VSS on J7.6 1-2: GND VSS selection

3.1.1 Theory of Operation for DAC81408 Hardware

The block diagram of the DAC81408EVM board is displayed in Figure 4. The EVM board connects to

external power supplies VCC, VSS, VDD/VAA and VIO through an external 7-pin terminal block. This

connector also provides an option for an external reference. The 32-pin header provides the eight DAC

outputs and other signals, such as VREF, TEMPOUT and ALMOUT. The 10-pin wire-to-board connector

provides an interface to the USB2ANY platform. The SPI signals are provided by using either the

USB2ANY header or the test points. The USB2ANY also provides the optional 3.3-V VIO selectable by

jumper settings. There is also an onboard 2.5-V reference source.

Figure 4. DAC81408EVM Hardware Block Diagram

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Detailed Description

SLAU778A–June 2018–Revised December 2018

DAC81408EVM

3.1.2 Signal Definition of USB2ANY

The DAC81408EVM provides a hardware connector (J8) that connects to the USB2ANY interface board.

The USBANY platform supplies VIO power and is responsible for providing the SPI commands sent from

the PC GUI software. Optionally, the VIO supply can be provided through an external supply, and all

digital communication lines can be accessed through their respective digital test points. Table 6 provides

the pin definitions for this connector. Table 7 provides the corresponding test points for the SPI signals.

Table 6. J8 (USB2ANY) Pin Definitions

Pin# Signal Description

1 GPIO7 General purpose I/O

2 CS/GPIO6 CS or general-purpose I/O

3 RXD/MISO SPI MISO

4 TXD/MOSI SPI MOSI

5 3.3V 3.3-V supply

6 GND Ground

7 GPIO3 General-purpose I/O

8SCLK/GPIO2 SPI SCLK or general-purpose

I/O

9 GPIO1 General-purpose I/O

10 GPIO0 General-purpose I/O

Table 7. J8 SPI Signal Test Points

Test Points SPI Signal

TP6 MISO, SDO

TP7 CS

TP8 MOSI, SDI

TP9 LDAC

TP10 SCLK

3.1.3 DAC Signal Pins

The DAC81408EVM provides access to all DAC outputs through connection J1, as shown in Figure 5, and

listed in Table 8.

Detailed Description

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DAC81408EVM

Figure 5. DAC Output Header

Table 8. J1 Pin Definitions

Name Connector Description

OUT0 J1.26 DAC output voltage

OUT1 J1.28 DAC output voltage

OUT2 J1.30 DAC output voltage

OUT3 J1.32 DAC output voltage

OUT4 J1.2 DAC output voltage

OUT5 J1.4 DAC output voltage

OUT6 J1.6 DAC output voltage

OUT7 J1.8 DAC output voltage

ALMOUT J1.1 DAC alarm output

TEMPOUT J1.3 DAC temperature output

REFGND J1.5 DAC REFGND

VREF J1.7 DAC reference

GND J1.9, J1.11, J1.13, J1.15, J1.17, J1.19, J1.21,

J1.23, J1.25, J1.27, J1.29, J1.31 DAC ground

NC J1.10, J1.12, J1.14, J1.16, J1.18, J1.20, J1.22,

J1.24 Not connected

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Detailed Description

SLAU778A–June 2018–Revised December 2018

DAC81408EVM

3.2 Software Description

This section describes the features of the DAC81408 EVM software, and discusses how to use these

features. The software provides basic control of all the registers and functions to the DAC81408 device.

3.2.1 Starting the Software

After the DAC81408 EVM software is installed, a restart may be required by Windows. To launch the

software, locate the Texas Instruments folder in the All Programs menu, and select the DAC81408 EVM

icon.

Figure 6. DAC81408EVM GUI Location

Figure 7 shows that the USB2ANY hardware is correctly connected because the status bar at the bottom

of the screen displays HARDWARE CONNECTED. If the USB2ANY is not properly connected or not

connected at all, the status bar displays DEMO. If the GUI is not displaying the HARDWARE

CONNECTED status while the USB2ANY is connected, unplug and reconnect the USB2ANY, and

relaunch the GUI software.

Figure 7. DAC81408EVM GUI Connection Detection

Detailed Description

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DAC81408EVM

3.2.2 Software Features

The DAC81408 EVM incorporates interactive functions that help configure the DAC81408 device. These

functions are built into several GUI pages, as shown in Figure 8. Use the Page Selection menu to switch

between the pages, with each page representing a feature of the software.

Figure 8. DAC81408EVM Software Page Selection

3.2.2.1 Low Level Configuration Page

The DAC81408 EVM Register Map page, shown in Figure 9, provides access to low level communication

directly with the DAC81408 registers. Selecting a register on the Register Map list shows a description of

the values in that register, as well as information on the register address, default value, size, and current

value. Values can be read and written to the registers by writing to the Value or bit field of the GUI.

Table des matières

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