Texas Instruments DAC8811 User manual

EVM User's Guide: DAC8811EVM
DAC8811 Evaluation Module
Description
The DAC8811 16-bit multiplying digital-to-analog
converter (DAC) is an accurate, low-power, easy-to-
use device with a precise, unbuffered, current output.
The DAC8811EVM showcases the DAC8811 and a
configurable operation amplifier (op amp) circuit. By
default, the EVM uses the OPA2828 in a bipolar ±10-
V output configuration, but supports the addition of a
DIP connection for other op amps.
Get Started
1. Order the EVM.
2. Configure EVM jumpers.
3. Install DAC8811EVM GUI on ti.com.
4. Connect USB and external power supplies.
5. Launch DAC8811EVM GUI.
Features
• Configurable circuit to evaluate DAC with
operational amplifiers
• Onboard VDD and VREF support
• FT4222 used to easily write to DAC using
DAC8811EVM GUI
• External SPI connections available
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1 Evaluation Module Overview
1.1 Introduction
This user's guide describes the characteristics, operation, and recommended use cases of the DAC8811EVM.
This document provides examples and instructions on how to use the DAC8811EVM board and included
software. Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous
with the DAC8811EVM. This document also includes a schematic, reference printed circuit board (PCB) layouts,
and a complete bill of materials (BOM).
1.2 Kit Contents
Table 1-1 details the contents of the EVM kit. Contact the TI Product Information Center at [phone] if any
component is missing. Download the latest versions of the related software on the TI website, www.ti.com.
Table 1-1. DAC8811EVM Kit Contents
Item Quantity
DAC8811EVM 1
USB-A to Micro-USB Cable 1
1.3 Specification
Figure 1-1 shows the block diagram of the DAC8811EVM board. By default, the DAC8811EVM connects to a
local machine USB port through a USB-A to Micro-USB cable.
PVDD
(Optional) VCC VSS
VREF
(Optional)
USB
Micro
LDOs PVDD / VREF
Selector
SPI
Headers
FTDI
Controller
Level
Shifters DAC8811 VOUT
OPA2828
Figure 1-1. DAC8811EVM Functional Block Diagram
With the default jumper settings, the USB sources a 3.3-V supply for VDD and a 2.5-V reference for VREF
through onboard low-dropout regulators (LDOs). The VDD and VREF supplies source power through J9 and
J10, respectively. To use external supplies, remove the shunts connecting the jumpers, use banana jack
connectors at J3 for GND, J4 for VDD, and use SMA connectors at J5 for VREF.
The OPA2828 is powered by external banana jack connectors at J1 and J2, for VCC and VSS respectively. The
first amplifier converts the current output of the DAC8811 to a voltage, then the second amplifier gains the output
to be a bipolar ±10-V output. The OPA2828 circuit can be configured to support other gain or shift values, and
also other operational amplifiers.
1.4 Device Information
The documents in Table 1-2 provide information regarding Texas Instruments integrated circuits used in the
assembly of the DAC8811EVM. This user's guide is available from the TI web site under literature number
SLAU151. 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 are available from the TI web site at www.ti.com, or call
Evaluation Module Overview www.ti.com
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the Texas Instruments Literature Response Center at [phone] or the Product Information Center at (972)
644-5580. When ordering, identify the document by both title and literature number.
Table 1-2. Related Device Documentation
Document Literature Number
DAC8811 product data sheet SLAS411
OPA2828 product data sheet SBOS671
REF5025 product data sheet SBOS410
SN74LV4T125 product data sheet SCLS749
TPD1E10B09 product data sheet SLLSEB0
TPS73443-Q1 product data sheet SBVS185
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2 Hardware
2.1 Power Requirements
The USB connection at J12 provides 5 V of power to the EVM. This connection is necessary if using the
DAC8811EVM-GUI, as the FT4222 is powered by one of the LDOs on the board. Two LDOs translate the USB
power to 3.3-V and 2.5-V supplies used for VDD and VREF respectively. There are jumper options available
to disconnect the supplies if external supplies are desired to power or regulate the DAC8811. VCC and VSS
must be provided externally for proper operation of the OPA2828 or any other op amp used. As the default
configuration is for a ±10 V output, TI recommends to provide between 11 V and 18 V to VCC and between –11
V and –18 V to VSS. Table 2-1 summarizes the external power connections.
Table 2-1. DAC8811EVM Power Supply Inputs
Terminal Name Function
J1 VCC External +11 V to +18 V connection for OPA2828's VCC (required)
J2 VSS External –11 V to –18 V connection for OPA2828's VSS (required)
J3 GND Ground connection
J4 VDD Optional external VDD power supply (disconnect J9 when using external supply)
J5 VREF Optional external VREF power supply (disconnect J10 when using external supply)
2.2 Jumper Information
The jumper settings on the DAC8811EVM are crucial to the proper operation of the EVM. Table 2-2 provides the
details of the configurable jumper settings on the EVM. Figure 2-1 shows the default jumper connections on the
board.
Table 2-2. DAC8811EVM Jumper Summary
Header Name Function
J9 VDD = 3p3V Short 1-2 – VDD supplied through USB power (default)
Open – VDD supplied through J4
J10 VREF = 2p5V Short 1-2 – VREF supplied through USB power (default)
Open – VREF supplied through J5
J11 FTDI_DIS Short 1-2 – FTDI SPI level shifter disabled
Open – FTDI SPI level shifter enabled (default)
Figure 2-1. Default Header Settings for the DAC8811EVM
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2.3 Setup
After the power and jumper configurations are set up per Table 2-1 and Table 2-2, and the DAC8811EVM GUI is
fully installed, connect the USB cable from the DAC8811EVM USB port to the local machine. Figure 2-2 displays
the system hardware setup.
USB /
Digital
Control
VDD / VREF
Selection
DAC8811
External ±15 V
Supplies
OPA2828 Bipolar ±10-V
Output
External ±11-V
to ±18-V
Supplies
DAC8811EVM
DAC8811EVM
GUI
External
Power Supply
(Optional)
Figure 2-2. DAC8811EVM Hardware Setup
The DAC8811EVM features a configurable op amp circuit that can be modified to change the output of the EVM.
Figure 2-3 shows the available resistors and capacitors in the circuit. Any components crossed out with a red "X"
are not included by default with the EVM.
Figure 2-3. DAC8811EVM Op Amp Configuration
To change the output voltage range for the circuit, the resistance at R3, R4, or R6 can be changed. This can
easily be done by swapping the entire resistor or adding another resistor in parallel to change the equivalent
resistance. The below equation can be used to calculate new resistor values if desired.
VOUT =R4
R6×
VREF ×Code
2BITS −R4
R3×VREF (1)
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If an op amp other than the OPA2828 is used, then U2 can be removed from the EVM and another op amp
can be added. The new op amp must either be a HVSSOP or DIP-8 package type. Figure 2-4 shows the pin
configuration of the DIP-8 adapter included on the DAC8811EVM.
Figure 2-4. DAC8811EVM Op Amp DIP Adapter
2.4 Header Information
The EVM provides access to the digital DAC8811 pins through header J8. Table 2-3 lists the J8 pin definitions.
Table 2-3. DAC8811EVM Header J8 Pin Definitions
Pin Number Signal Description
1 SCLK DAC8811 SPI serial clock input
3 PICO DAC8811 SDI (serial data input)
5 CS DAC8811 chip select input
2, 4, 6 GND Ground
The pins on J8 can be used to externally control the DAC8811 with SPI messages if the FTDI controller is
disconnected from the DAC, by shunting the J11 jumper.
2.5 Test Points
The DAC8811EVM has a variety of test points available for measuring and debugging purposes. Table 2-4
explains the purpose of each test point.
Table 2-4. DAC8811EVM Test Points
Test Point Net Description
TP1 VDAC Output of DAC8811, ranges from 0-V to negative VREF
TP2 VREF DAC8811 reference voltage
TP3, not installed +IN_A Non-inverting input of the first op amp in OPA2828
TP4, not installed +IN_B Non-inverting input of the second op amp in OPA2828
TP5, not installed -IN_A Inverting input of the first op amp in OPA2828
TP6 VOUT ±10-V output of OPA2828 circuit
TP7 REF 2p5V Onboard 2.5-V reference provided by REF5025
TP8, not installed REF_TEMP TEMP pin of REF5025
TP9 USB 5 V Onboard 5-V provided by USB connection
TP10 LDO 3p3V Onboard 3.3-V supply provided by TPS73433-Q1
TP11, TP12, TP13, TP14, TP15 GND Ground connection
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3 Software
3.1 GUI Installation
This section provides the procedure for EVM software installation.
The EVM software is compatible with the Windows® 10 operating system. Before installing the software, make
sure that the DAC8811EVM is not connected to the local machine.
Download the latest version of the EVM graphical user interface (GUI) installer from the Order and start
development subsection of the DAC8811EVM tool folder on TI.com. Run the GUI installer to install the EVM
GUI software on your local machine.
When the DAC8811EVM software is launched, an installation dialog window opens and prompts the user
to select an installation directory. If left unchanged, Figure 3-1 shows that the software location defaults to
C:\Program Files (x86)\Texas Instruments\DAC8811EVM.
Figure 3-1. Software Installation Path
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The EVM software also installs the Future Technology Devices International Limited (FTDI) USB drivers using
a separate executable file, and automatically copies the required LabVIEW™ software files and drivers to the
local machine. Figure 3-2 shows the FTDI USB drivers installation window that is automatically launched after
the DAC8811EVM software installation is complete.
Figure 3-2. FTDI USB Drivers
3.2 Software Description
To launch the software, locate the Texas Instruments folder in the Start Menu, and select the DAC8811EVM icon.
Figure 3-3. DAC8811EVM Software Installation in Start Menu
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Figure 3-4 shows that if the onboard FTDI controller is connected correctly, then the status bar at the bottom of
the screen displays CONNECTED. If the controller is not properly connected or not connected at all, then the
status displays DEMO. If the graphical user interface (GUI) is not displaying the CONNECTED status while the
EVM is connected, then unplug and reconnect the EVM and relaunch the GUI software.
Figure 3-4. DAC8811EVM GUI Connection Detection
Figure 3-5 shows the DAC8811 Register page of the DAC8811EVM GUI. This page allows direct access to the
data register of the DAC8811. The GUI handles page address management, allowing seamless access to the
register.
The Register Map section in the center of the page lists the register. Directly above the Register Map section are
four buttons that allow access to the data register.
Figure 3-5. DAC8811EVM Register Page
To store the values of the register map locally, select Save Configuration under the File menu option. The stored
configuration files can be recalled and loaded by selecting Open Configuration.
Figure 3-6 shows the single configuration button, Write Selected, provided on the Register page above the
Register Map that allow the user to interact with the device registers:
Figure 3-6. DAC8811EVM Register Page Options
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4 Hardware Design Files
4.1 Schematics
The DAC8811EVM schematic is shown in Figure 4-1 and Figure 4-2.
Figure 4-1. DAC8811EVM Schematic: FTDI Controller
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