Texas Instruments DAC80502 User manual

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DAC80502 Evaluation Module
User's Guide
SLAU818–November 2019
DAC80502 Evaluation Module
This user’s guide describes the characteristics, operation, and use of the DAC80502EVM evaluation
module (EVM). This EVM is designed to evaluate the performance of the DAC80502 buffered voltage
output DAC in a variety of configurations. Throughout this document, the terms evaluation board,
evaluation module, and EVM are synonymous with the DAC80502EVM. This document includes a
schematic, reference printed-circuit board (PCB) layouts, and a complete bill of materials.

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Contents
1 Overview ..................................................................................................................... 3
1.1 Kit Contents ......................................................................................................... 3
1.2 Related Documentation from Texas Instruments .............................................................. 3
2 System Setup ................................................................................................................ 4
2.1 Software Setup ..................................................................................................... 4
2.2 Hardware Setup .................................................................................................... 5
3 Detailed Description......................................................................................................... 6
3.1 Hardware Description ............................................................................................. 6
3.2 Software Description ............................................................................................... 8
4 Schematic, PCB Layout, and Bill of Materials.......................................................................... 11
4.1 DAC80502EVM Schematic ...................................................................................... 11
4.2 PCB Components Layout ....................................................................................... 12
4.3 DAC80502EVM Bill of Materials................................................................................. 14
List of Figures
1 Software Setup............................................................................................................... 4
2 Software Installation Path .................................................................................................. 4
3 Hardware Setup.............................................................................................................. 5
4 DAC80502EVM Hardware Block Diagram ............................................................................... 6
5 DAC80502EVM GUI Location.............................................................................................. 8
6 GUI Connection Detection.................................................................................................. 8
7 Page Selection............................................................................................................... 9
8 Low Level Configuration Page............................................................................................. 9
9 Low Level Configuration Page Options ................................................................................. 10
10 High Level Configuration Page........................................................................................... 10
11 DAC80502EVM Schematic ............................................................................................... 11
12 PCB Layout - Component Placement ................................................................................... 12
13 PCB Layout - Top Layer .................................................................................................. 13
14 PCB Layout - Bottom Layer............................................................................................... 13
List of Tables
1 Contents of DAC80502EVM Kit............................................................................................ 3
2 Required Components Not Included With Kit............................................................................ 3
3 Related Documentation..................................................................................................... 3
4 Power Supply Inputs ........................................................................................................ 5
5 J1 (USB2ANY) Pin Definitions............................................................................................. 7
6 J1 SPI Signal Test Points .................................................................................................. 7
7 DAC Output Connector Pin Definitions ................................................................................... 7
8 DAC80502EVM Bill of Materials.......................................................................................... 14
Trademarks
Windows is a trademark of Microsoft Corporation.
All other trademarks are the property of their respective owners.

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DAC80502 Evaluation Module
1 Overview
The DAC80502EVM is an easy-to-use platform to evaluate the functionality and performance of the
DAC80502 device. The DAC80502 is a dual-channel, buffered, digital-to-analog converter (DAC) in 16-bit
resolution with 2.5-V internal reference. This EVM provides output voltage from 0 V to 5 V. The EVM also
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 at the phone
number provided in Section 1.2 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 DAC80502EVM Kit
Item Quantity
DAC80502EVM evaluation board PCB 1
Table 2. Required Components Not Included With Kit
Item Quantity
USB2ANY interface adapter 1
The USB2ANY interface adapter can be purchased from the USB2ANY interface adapter product folder
on www.ti.com.
1.2 Related Documentation from Texas Instruments
The following document provides information regarding Texas Instruments integrated circuits used in the
assembly of the DAC80502EVM. This user's guide is available from the TI website under literature
number SLAU818. 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 website
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
DAC80502 product data sheet SBAS793

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2 System Setup
2.1 Software Setup
This section provides the procedure for EVM software installation.
2.1.1 Operating Systems
The EVM software is compatible with the Windows™ 7 and 10 operating systems.
2.1.2 Software Installation
The software is available through the DAC80502EVM product folder. After the software is downloaded
onto the PC, navigate to the DAC80502EVM folder, and run the Setup_DAC80502_EVM.exe file, as
shown in Figure 1. 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\DAC80502 EVM, as shown in Figure 2. The software installation automatically
copies the required files and drivers to the local machine.
Figure 1. Software Setup
Figure 2. Software Installation Path

USB2ANY POWE R SUPPLY
(Optional)
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2.2 Hardware Setup
This section provides the overall system setup for the EVM. A PC runs software that provides an interface
to the USB2ANY platform. This platform generates the optional 3.3-V power and digital signals used to
communicate with the EVM board. Connectors are included on the EVM board for external power
supplies. Figure 3 displays the system setup for the DAC80502EVM.
Figure 3. Hardware Setup
2.2.1 Power Configurations
The DAC80502EVM provides electrical connections to the device supply pins. The connectors and
optional configurations are shown in the Table 4. The headroom between the reference and the power
supply must be maintained. See the DAC80502 data sheet for details.
Table 4. Power Supply Inputs
DAC80502EVM
Connector Supply Name Voltage Range
J2.1 VDD 2.7 V to 5.5 V
J2.2 GND 0 V
JP1.2 (Default) USB_3p3
3.3 V from USB2ANY.
NOTE: The REF-DIV bit must be 1 so that the internal 2.5-V
reference is divided by 2 to meet the headroom requirements.
The maximum output possible in this mode is 2.5 V.
Use a 5-V external VDD on J2 for a higher voltage swing.
2.2.2 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 J1 connector. Verify the connection is
snug; loose connections may cause intermittent operation.
2.2.3 Electrostatic Discharge Warning
Many of the components on the DAC80502EVM 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.

DAC80502
(U1)
USB2ANY
Interface (J1)
Power Input
(J2, JP1)
Onboard Reference
(U2)
Jumper Settings
(JP1 to JP5)
Output Interface
(J3, J4)
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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.
3.1.1 Theory of Operation for the DAC80502EVM Hardware
The block diagram of the DAC80502EVM board is displayed in Figure 4. The EVM board connects to
external power supply VDD either through USB2ANY (3.3 V) or through JP2. The headroom for the
reference must be maintained as specified in the DAC80502 data sheet. The 10-pin wire-to-board
connector, J1, provides an interface to the USB2ANY platform. The SPI signals are provided either by
using the USB2ANY header or the test points. Use JP4 to select the onboard 5-V reference source. JP4 is
open by default, making the DAC work with the internal reference.
Figure 4. DAC80502EVM Hardware Block Diagram

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3.1.2 Signal Definition of the DAC80502EVM
The DAC80502EVM provides a hardware connector (J1) 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 VDD supply can be provided through an external supply, and all
digital communication lines can be accessed through their respective digital test points. Table 5 provides
the pin definitions for this connector. Table 6 provides the corresponding test points for the SPI signals.
Table 5. J1 (USB2ANY) Pin Definitions
Pin# Signal Description
1 GPIO7 General-purpose I/O
2 CS/GPIO6 CS | 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
8 SCLK/GPIO2 SPI SCLK
9 GPIO1 General-purpose I/O
10 GPIO0 General-purpose I/O
Table 6. J1 SPI Signal Test Points
Test Points SPI Signal
TP1 SCLK
TP2, TP3 GND
TP4 MOSI/SDI
TP5 SYNC
3.1.3 DAC Signal Pins
The DAC80502EVM provides access to the DAC output through connection J3 and J4, as listed in
Table 7.
Table 7. DAC Output Connector Pin Definitions
Connector-Pin Signal Name
J3-1 VOUTA
J3-2 GND
J4-1 VOUTB
J4-2 GND

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3.2 Software Description
This section describes the features of the DAC80502 EVM software, and discusses how to use these
features. The software provides basic control of all the registers and functions to the DAC80502 device.
3.2.1 Starting the Software
To launch the software, locate the Texas Instruments folder in the All Programs menu, and select the
DAC80502 EVM icon.
Figure 5. DAC80502EVM GUI Location
Figure 6 shows that If the USB2ANY is correctly connected, 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 6. GUI Connection Detection

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3.2.2 Software Features
The DAC80502 EVM incorporates interactive functions that help configure the DAC80502 device. These
functions are built into several GUI pages, as shown in Figure 7. The Page Selection menu allows the
user to switch between the pages, with each page representing a feature of the software.
Figure 7. Page Selection
3.2.2.1 Low Level Configuration Page
The DAC80502 EVM Register Map page, shown in Figure 8, allows the user to access low level
communication directly with the DAC80502 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.
Figure 8. Low Level Configuration Page

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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 options selectable by the user are the Update Mode,Write Selected,Read Selected,Write
Modified, and Read All buttons. All buttons are displayed in Figure 9.
Figure 9. Low Level Configuration Page Options
If Immediate is selected under Update Mode, all changes to register values update immediately. The
Deferred option allows the user 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.
3.2.2.2 High Level Configuration Page
The High Level Configuration page provides an easy interface to program the output code for the
DAC80502 device. This page is displayed in Figure 10.
Figure 10. High Level Configuration Page

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4 Schematic, PCB Layout, and Bill of Materials
This section contains the complete bill of materials, PCB layout, and schematic diagram for DAC80502EVM.
4.1 DAC80502EVM Schematic
Figure 11. DAC80502EVM Schematic

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4.2 PCB Components Layout
Figure 12. PCB Layout - Component Placement

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Figure 13. PCB Layout - Top Layer
Figure 14. PCB Layout - Bottom Layer

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4.3 DAC80502EVM Bill of Materials
Table 8. DAC80502EVM Bill of Materials
Designator Quantity Value Description PackageReference PartNumber Manufacturer
!PCB 1 Printed Circuit Board DC094-001 Any
C1, C3, C6, C7 4 1uF CAP, CERM, 1 uF, 25 V,
+/- 10%, X7R, 0603 0603 C1608X7R1E105K080AB TDK
C2 1 10uF CAP, TA, 10 uF, 16 V,
+/- 20%, 2 ohm, SMD 3528-21 293D106X0016B2TE3 Vishay-Sprague
C4, C8 2 0.1uF CAP, CERM, 0.1 uF, 25
V, +/- 10%, X7R, 0603 0603 06033C104KAT2A AVX
C5 1 10uF CAP, TA, 10 uF, 16 V,
+/- 10%, 0.8 ohm, SMD 3528-21 TPSB106K016R0800 AVX
H1, H2, H3, H4 4 Bumpon, Hemisphere,
0.44 X 0.20, Clear Transparent Bumpon SJ-5303 (CLEAR) 3M
J1 1 Header (shrouded),
100mil, 5x2, Gold, SMT SMT Header 52601-S10-8LF FCI
J2, J3, J4 3 Terminal Block, 3.5mm
Pitch, 2x1, TH 7.0x8.2x6.5mm ED555/2DS On-Shore Technology
JP1, JP2, JP3, JP4, JP5 5 Header, 2.54mm, 2x1,
Tin, SMT Header, 2.54mm, 2x1, SMT M20-8770246 Harwin
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, R3, R4, R5 5 10k RES, 10 k, 5%, 0.1 W,
AEC-Q200 Grade 0,
0603
0603 CRCW060310K0JNEA Vishay-Dale
SH-JP1, SH-JP2, SH-
JP5 3 1x2 Shunt, 100mil, Gold plated, Black Shunt SNT-100-BK-G Samtec
TP1, TP2, TP3, TP4,
TP5, TP6, TP7, TP8,
TP9
9 Test Point, Miniature,
SMT Test Point, Miniature, SMT 5019 Keystone
U1 1 DAC80502DRX,
DRX0010A (WSON-10) DRX0010A DAC80502DRX 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 REF5050AID Texas Instruments

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