Texas Instruments DAC8811 Manual de usuario

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

www.ti.com Description

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DAC8811 Evaluation Module 1

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 (972) 644-5580 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 (800) 477-8924 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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DAC8811 Evaluation Module 3

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

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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DAC8811 Evaluation Module 5

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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DAC8811 Evaluation Module 7

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

Software www.ti.com

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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

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

Figure 3-6. DAC8811EVM Register Page Options

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DAC8811 Evaluation Module 9

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

Hardware Design Files www.ti.com

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