Texas Instruments DAC81408EVM User manual

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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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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 [phone] or
the Product Information Center at [phone]. 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
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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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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
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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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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.

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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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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

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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.