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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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.

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Figure 9. Low Level Configuration Page
The values of the register map can also be saved by pressing the Save Configuration button under the
File menu option. Additionally, the configuration files can be accessed through the Load Configuration
button. Other selectable options include the Update Mode,Write Selected,Read Selected,Write Modified,
and Read All buttons. All buttons are displayed in Figure 10.
Figure 10. Low Level Configuration Page Options
If Immediate is selected under Update Mode, all changes to register values update immediately. Use the
Deferred option to modify the value of a register without taking effect until the Write Selected or Write
Modified button is pressed. The Read Selected button allows individual register reads, whereas the Read
All button reads the status of all registers located in the register map.

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3.2.2.2 High Level Configuration Page
The High Level Configuration page provides an interface to monitor and control the different data
registers, modes, and configurations available for the DAC81408 device. This page is displayed in
Figure 11.
Figure 11. High Level Configuration Page
Power Down: The power-down bits of all eight DAC channels and the global power down bit are all
enabled by default. Both the device and individual channels must be powered up in order to get output.
Reference: The internal voltage reference is by default OFF on DACx1408. The EVM selects the onboard
reference by default.
Output Range: The DACx1408 provides various range options at individual channel level. This selection
can be done on the GUI.
DAC Outputs: The DAC outputs can be operated either in single-ended or differential modes.

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4 Schematic, PCB Layout, and Bill of Materials
This section contains the schematic diagram, printed circuit board layout, and a complete bill of materials
for the DAC81408EVM.
4.1 Board Schematic
Figure 12. DAC81408EVM Board Schematic

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4.2 PCB Components Layout
Figure 13 through Figure 17 show the layout of the components for the DAC81408EVM board.
Figure 13. DAC81408EVM PCB Components Layout

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Figure 14. Top Layer

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Figure 15. Layer 2 - Ground Plane

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Figure 16. Layer 3 - Power Plane

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Figure 17. Bottom Layer

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4.3 Bill of Materials
Table 9 lists the bill of materials (BOM).
Table 9. DAC81408 EVM Bill of Materials
Designator Quantity Value Description Package Reference Part Number Manufacturer
!PCB 1 Printed Circuit Board DC051 Any
@H1, @H2, @H3, @H4 4 Hex Standoff, #4-40,
Aluminum, 1/4" 1/4 inch Aluminum Hex Standoff 1891 Keystone
C1, C4, C5, C10, C12,
C14, C15 7 1uF CAP, CERM, 1 uF, 16 V, +/- 10%, X5R, 0603 0603 C0603C105K4PACTU Kemet
C2, C3, C13 3 0.1uF CAP, CERM, 0.1 uF, 16
V, +/- 5%, X7R, 0603 0603 C0603C104J4RACTU Kemet
C6, C11, C18 3 10uF CAP, CERM, 10 uF, 35
V, +/- 10%, X6S, 0805 0805 GRM21BC8YA106KE11L MuRata
C7, C8 2 10uF CAP, CERM, 10 uF, 50
V, +/- 10%, X7R, AEC-
Q200 Grade 1, 1210
1210 UMJ325KB7106KMHT Taiyo Yuden
C9 1 1000pF CAP, CERM, 1000 pF,
50 V, +/- 10%, X7R,
0603
0603 C0603C102K5RACTU Kemet
C16, C17, C19 3 1uF CAP, CERM, 1 uF, 25 V,
+/- 10%, X5R, 0603 0603 C1608X5R1E105K080A CTDK
H1, H2, H3, H4 4 Screw Pan Head M3 Screw M3 29311 Keystone
J1 1 Header, 100mil, 16x2,
Tin, SMT 16x2 Header TSM-116-01-T-DV-P Samtec
J2, J3, J9 3 Header, 100mil, 2x1,
Gold with Tin Tail, SMT 2x1 Header TSM-102-01-L-SV Samtec
J7 1 TERM BLOCK, 7POS,
3.5MM, TH 24.5x9.2x7.6mm 1984662 Phoenix Contact
J8 1 Header(Shrouded),
2.54mm, 5x2, Gold, TH Header, 2.54mm, 5x2, TH AWHW-10G-0202-T Assman WSW
J10, J11, J12 3 Header, 2.54mm, 3x1,
Gold, SMT Header, 2.54mm, 3x1, SMT TSM-103-01-L-SV-P-TR Samtec
L1, L2 2 600 ohm Ferrite Bead, 600 ohm @
100 MHz, 1 A, 0603 0603 742792651 Wurth Elektronik
LBL1 1 Thermal Transfer
Printable Labels, 0.650"
W x 0.200" H - 10,000
per roll
PCB Label 0.650 x 0.200
inch THT-14-423-10 Brady
R1, R2, R12, R13, R14,
R15, R16, R17 8 10.0k RES, 10.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0710KL Yageo America

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Table 9. DAC81408 EVM Bill of Materials (continued)
Designator Quantity Value Description Package Reference Part Number Manufacturer
R3, R4, R5, R6, R8, R9,
R10, R11 8 0 RES, 0, 5%, 0.1 W, 0603 0603 RC0603JR-070RL Yageo America
R7 1 33 RES, 33, 5%, 0.1 W,
AEC-Q200 Grade 0,
0603
0603 CRCW060333R0JNEA Vishay-Dale
R18 1 0.51 RES, 0.51, 1%, 0.1 W,
AEC-Q200 Grade 1,
0603
0603 ERJ-3RQFR51V Panasonic
R19 1 1.00 RES, 1.00, 1%, 0.1 W,
0603 0603 RC0603FR-071RL Yageo America
SH-J1, SH-J2, SH-J3,
SH-J4 4 1x2 Shunt, 100mil, Gold plated, Black Shunt SNT-100-BK-G Samtec
TP1, TP2, TP3, TP4,
TP5, TP11, TP13 7 Test Point, Compact, Red, TH Red Compact Testpoint 5005 Keystone
TP6, TP7, TP8, TP9,
TP10, TP14, TP15, TP16 8 Test Point, Miniature, SMT Test Point, Miniature, SMT 5019 Keystone
U1 1 8-Channel, 16-Bit, High-
Voltage Output DAC with
Precision Internal
Reference, RHA0040H
(VQFN-40)
RHA0040H DAC81408RHA Texas Instruments
U2 1 Low Noise, Very Low
Drift, Precision Voltage
Reference, -40 to 125
degC, 8-pin SOIC (D),
Green (RoHS & no
Sb/Br)
D0008A REF5025AIDR Texas Instruments
H5 0 Square Basket Heatsink
Featuring Slanted Fins Heat Sink TO-3 500403B00000G Aavid
J4, J5, J6 0 Connector, SMA, TH SMA 142-0701-231 Cinch Connectivity