Texas Instruments DAC80508-04EVM Manuel utilisateur

EVM User's Guide: DAC80508-04EVM

DAC80508-04 Evaluation Module

Description

The DAC80508-04EVM is an easy-to-use platform

to evaluate the functionality and performance of the

DACx0508 and DACx0504 family of devices. The

DAC80508-04EVM has optional circuits and jumpers

to configure the device for different applications. The

DAC80508 is installed on the EVM. The user can

replace the DAC80508 with the DAC80504.

The DAC80508 and DAC80504 are 16-bit buffered

voltage-output digital-to-analog converters (DAC).

The DAC80508 has 8 DACs, and the DAC80504

has 4 DACs. The devices includes a 2.5-V, 5-

ppm/°C internal reference and a user-selectable gain

configuration giving full-scale output voltages of 1.25

V, 2.5 V, or 5 V. The devices operate from a single

2.7-V to 5.5-V supply, is verified monotonic, and

provides exceptional linearity of ±1 LSB INL.

Get Started

1. Order the EVM.

2. Configure EVM jumpers.

3. Install the DAC805xxEVM GUI from ti.com.

4. Connect USB and external power supplies.

5. Launch the DAC805xxEVM GUI.

Features

• Configurable circuit to evaluate the DACx0508 and

DACx0504 family of devices

• Onboard VDD (5-V or 3.3-V) and VIO (5-V, 3.3-V,

or 1.8-V) support via USB and on-board voltage

regulators

• Option for external reference voltage or on-board

2.5-V reference voltage

• Trigger output is available for synchronous

measurement

• FT4232 easily writes to the DAC using the

DAC805xxEVM GUI

• External SPI connections available

Applications

•Optical networking

•Wireless infrastructure

•Industrial automation

•Data acquisition systems

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DAC80508-04 Evaluation Module 1

1 Evaluation Module Overview

1.1 Introduction

The DACx050x is a pin-compatible family of low-power, multi-channel, buffered voltage output, digital to-analog

converters (DAC). The DACx050x includes a 2.5-V, 5-ppm/°C internal reference, eliminating the need for an

external precision reference in most applications. A users-selectable gain configuration provides full-scale output

voltages of 1.25 V (gain = ½), 2.5 V (gain = 1) or 5 V (gain = 2). The device operates from a single 2.7-V to 5.5-V

supply, is specified monotonic, and provides high linearity of ±1 LSB INL.

Communication to the DACx050x is performed through a serial interface that operates at clock rates up to

50 MHz. The VIO pin enables serial interface operation from 1.7 V to 5.5 V. The DACx050x flexible interface

enables operation with a wide range of industry-standard microprocessors and micro-controllers.

The DACx050x incorporates a power-on-reset circuit that powers up and maintains the DAC outputs at either

zero-scale or mid-scale until a valid code is written to the device. The devices consume low current of 0.6

mA/channel at 5.5 V, making the devices an excellent choice for battery-operated equipment. A per-channel

power down feature reduces the device current consumption to 15 µA.

This user's guide describes the characteristics, operation, and recommended use cases of the

DAC80508-04EVM. This document provides examples and instructions on how to use the DAC80508-04EVM

board and included software. Throughout this document, the terms evaluation board, evaluation module, and

EVM are synonymous with the DAC80508-04EVM. This document also includes schematics, the 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. DAC80508-04EVM Kit Contents

Item Quantity

DAC80508-04EVM board 1

USB micro-B plug to USB-A plug cable 1

1.3 Specification

The EVM is intended to provide basic functional evaluation of the device. The layout is not intended to be a

model for the target circuit, nor laid out for electromagnetic compatibility (EMC) testing. The EVM consists of a

printed-circuit board (PCB), which has the DAC80508 installed.

1.4 Device Information

Table 1-2 lists the devices supported by the DAC80508-04EVM. DACx050x is used as a generic name for these

devices. This document focuses on the DAC80508, which comes pre-installed on the EVM, and the DAC80504.

Table 1-2. DAC80508-04EVM Supported Devices

DACx050x DAC Resolution Number of DACs

DAC60504 12-bit 4

DAC70504 14-bit 4

DAC80504 16-bit 4

DAC60508 12-bit 8

DAC70508 14-bit 8

DAC80508 16-bit 8

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2 Hardware

2.1 Hardware Setup

This section describes the overall system setup for the EVM. A computer runs software that communicates with

the FTDI controller onboard using SPI protocol.

2.1.1 Hardware Theory of Operation

The DAC80508-04EVM is connected to the computer through the on-board FTDI digital controller using the

USB cable that is supplied with the EVM. The evaluation board features connectors and test points for all

communication lines, DAC outputs, and supplies. Figure 2-1 shows a block diagram of the DAC80508-04EVM.

DAC80508-04EVM Power Supplies

USB Micro

LDOs

FTDI Controller

Trigger

Level Shifter

Digital

Headers

Supply

Selection

DAC80508

DAC80504

DAC80508

DAC80504

Outputs

Figure 2-1. Theory of Operation Block Diagram

The USB connection provides the 5-V supply to the EVM. Voltage regulators generate 3.3 V and 1.8 V from the

USB 5-V supply. These 3.3-V and 1.8-V supplies are used to power the FTDI controller.

The VDD supply can use the on-board 5-V or 3.3-V supplies depending on the jumper J6 setting. By default,

VDD is connected to the on-board 5-V supply. Alternatively, VDD can be supplied externally through banana jack

J4. Remove the jumper connector on J6 before connecting external supplies to VDD.

The VIO supply can use the on-board 1.8 V or use the same voltage as VDD depending on the jumper J5

setting. By default, VIO is connected to VDD. Alternatively, VIO can be supplied externally through banana jack

J8. Remove the jumper connector on J5 before connecting external supplies to VIO.

The device reference voltage can be supplied via an onboard 2.5-V voltage regulator by shorting jumper J12,

or from an external supply with SMA connector J10. Make sure that the internal reference is powered off before

connecting any other voltage supply to the REF pin.

Each of the DAC outputs have footprints available for capacitor and resistor loads that are unpopulated by

default.

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DAC80508-04 Evaluation Module 3

2.1.2 Jumper Definitions

The jumpers must be connected properly to operate the DAC80508-04EVM. Table 2-1 provides the details of the

configurable jumper settings of the DAC80508-04EVM. Figure 2-2 shows the default jumper connections on the

board.

Table 2-1. DAC80508-04EVM Jumper Definitions

Designator Name Positions

J1 FTDI DIS SHORT 1-2 – FTDI communication is disabled.

OPEN – FTDI communication is enabled (default).

J5 VIO SEL

SHORT 1-2 – VIO is connected to VDD (default).

SHORT 3-4 – VIO is connected to the 1.8-V voltage regulator.

OPEN – VIO is not powered by on-board supplies

No other jumper orientation allowed.

J6 VDD SEL

SHORT 1-2 – VDD is connected to the 5 V from the USB power (default).

SHORT 3-4 – VSSB is connected to 3.3-V voltage regulator.

OPEN – VDD is not powered by on-board supplies.

No other jumper orientation allowed.

J12 VREF = 2.5 V

SHORT 1-2 – Connects the DAC80508 REF pin to the on-board 2.5-V reference.

Make sure the internal reference is powered off before closing this jumper.

OPEN – Open if internal reference or external reference via J10 is used (default)

If an external reference is used, then turn off the internal reference.

Figure 2-2. DAC80508-04EVM Default Jumper Settings

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2.1.3 Connector Definitions

Table 2-2 shows the power connector definitions of the DAC80508-04EVM.

Table 2-2. Power Connector Definitions

Designator Definition

J2 SMA connector FTDI Trigger Input

(unpopulated)

J3 USB connector

J4 DAC80508 VDD supply (2.7 V to 5.5 V)

J7 DAC80508 Ground

J8 DAC80508 VIO supply (1.7 V to 5.5 V)

J10 DAC80508 external REF (unpopulated)

Table 2-3 shows output connector definitions for the DAC80508-04EVM.

Table 2-3. Output Connector Definitions

Designator Definition

J13 SMA connector for OUT0 (unpopulated)

J14 SMA connector for OUT3 (unpopulated)

J16 SMA connector for OUT1 (unpopulated)

J17 SMA connector for OUT2 (unpopulated)

Table 2-4 shows output header J11 definitions for the DAC80508-04EVM.

Table 2-4. Output Header J11 Definitions

Pin Definition

2DAC80508: OUT7

DAC80504: LDAC

4DAC80508: OUT6

DAC80504: REFDIV

6DAC80508: OUT5

DAC80504: RSTSEL

8DAC80508: OUT4

DAC80504: GAIN

10 OUT3

12 OUT2

14 OUT1

16 OUT0

1, 3, 5, 7, 9, 11, 13, 15 Ground

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DAC80508-04 Evaluation Module 5

2.1.4 Test Points

The DAC80508-04EVM has a variety of test points available for measuring and debugging purposes. Table 2-5

explains the purpose of each test point.

Table 2-5. DAC80508-04EVM Test Points

Test Point Net Description

TP1 3p3V On-board 3.3-V supply

TP2 1p8V On-board 1.8-V supply

TP3 5V_USB On-board 5-V USB supply

TP4 AD6 FTDI Trigger test point (unpopulated)

TP5, TP6, TP7, TP8 GND Ground test points

TP9 VDD VDD test point

TP10 VIO VIO test point

TP11 VREF REF test point

TP12 OUT0 Dedicated OUT0 test point for measuring OUT noise

TP13 GND Dedicated ground test point for measuring OUT noise

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2.2 Hardware Overview

This section details how to configure the EVM for voltage outputs using SPI. The following subsections provide

detailed information on the EVM hardware.

2.2.1 Electrostatic Discharge Caution

CAUTION

Many of the components on the DAC80508-04EVM are susceptible to damage by electrostatic

discharge (ESD). Customers are advised to observe proper ESD handling precautions when

unpacking and handling the EVM, including the use of a grounded wrist strap at an approved ESD

workstation.

2.2.2 Connecting the FTDI Digital Controller

To connect the FTDI digital controller on the EVM board to the computer, align and firmly connect the USB

connector to the J3 connector. Verify the connection is snug; a loose connection can cause intermittent

operation. A 100 mil header (J15) is available for external communication. Table 2-6 lists the J15 pin definitions.

To use external communication, close jumper J1 to disable the connection to the FTDI controller.

Table 2-6. Digital Header J15 Pin Definitions

Pin Definition

DAC80508: POCI

DAC80508C: CLEAR

If using the CLEAR version of the

DAC80508, then TI recommends to

install a pull-up resistor to VIO using

R33.

4 CS

6 PICO

8 SCLK

1, 3, 5, 7 Ground

Additionally, the board has a dedicated 100 mil header for the DAC80504 digital pins. The DUT connects to this

header with 0 Ω resistors, which are unpopulated by default. If the DAC80504 is used, then TI recommends to

populate R29, R30, R31, and R32 to connect the GAIN, RSTSEL, REFDIV, and LDAC to the FTDI and digital

header. Table 2-7 lists the pin definitions.

Table 2-7. Digital Header J9 Pin Definitions

Pin Definition

2 GAIN

4 RSTSEL

6 REFDIV

8 LDAC

1, 3, 5, 7 Ground

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DAC80508-04 Evaluation Module 7

3 Software

3.1 Software Setup

This section provides the procedure for EVM software installation.

3.1.1 Software Installation

Note

Do not connect the EVM to the computer while the software is installing.

Download the latest version of the EVM graphical user interface (GUI) installer from the Order and start

development subsection of the DAC80508-04EVM tool folder on TI.com. Run the GUI installer to install the

DAC805xxEVM GUI software on your computer. The software installation automatically copies the required

LabVIEW™ software files and drivers to the computer.

When the DAC805xx GUI 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\DAC805xxEVM.

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. Figure 3-2 shows the FTDI USB drivers installation window that is automatically

launched after the DAC805xxEVM software installation is complete.

Figure 3-2. FTDI USB Drivers

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DAC80508-04 Evaluation Module 9

3.2 Software Overview

This section discusses how to use the DAC805xxEVM software.

3.2.1 Launching the Software

If installed in the default directory, then launch the DAC805xxEVM software by searching for DAC805xxEVM

GUI in the Windows® Start menu.

Figure 3-3 shows the Device Setting configuration menu that is present when the GUI is launched. Select either

the DAC80504 or DAC80508 device from the drop-down menu and click CONFIG. The software only supports

one device at a time.

Figure 3-3. DAC805xxEVM GUI Device Settings at Launch

Figure 3-4 shows the GUI after launch with the DAC80504 register map loaded. Figure 3-5 shows the GUI after

launch with the DAC80508 register map loaded.

Figure 3-4. DAC805xxEVM GUI DAC80504 Selection at Launch

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