Texas Instruments DAC90 EVM Series User manual

SLAU726–August 2017

DAC90x Evaluation Module

User's Guide

SLAU726–August 2017

DAC90x Evaluation Module

This user's guide describes the function and use of the DAC90x evaluation module (EVM). Included in this

document are a quick-start guide, instructions for optimizing evaluation results, jumper and connector

descriptions, software description, and alternate hardware configurations.

Contents

1 Overview...................................................................................................................... 2

1.1 Required Hardware................................................................................................. 2

1.2 Required Software.................................................................................................. 3

1.3 Evaluation Board Feature Identification Summary ............................................................. 3

1.4 References .......................................................................................................... 3

2 Quick-Start Guide............................................................................................................ 4

2.1 Software Installation................................................................................................ 4

2.2 Hardware Setup Procedure ....................................................................................... 5

2.3 Software Setup Procedure......................................................................................... 6

2.4 Quick-Start Troubleshooting....................................................................................... 8

3 Alternate Hardware Configurations........................................................................................ 9

3.1 Control Modes....................................................................................................... 9

3.2 External Clock Generation ....................................................................................... 10

3.3 Analog Output Circuits............................................................................................ 10

Appendix A Jumper and Connector Descriptions............................................................................ 12

List of Figures

1 DAC90xEVM Block Diagram............................................................................................... 2

2 EVM Feature Locations..................................................................................................... 3

3 Quick-Start Test Setup...................................................................................................... 5

4 Power Supply Connections................................................................................................. 6

5 HSDC Pro GUI Main Panel................................................................................................. 7

6 Reconfiguration Hardware Location....................................................................................... 9

7 External Clock Signal...................................................................................................... 10

List of Tables

1 Configuration Files........................................................................................................... 7

2 Troubleshooting Tips........................................................................................................ 8

3 Jumper Descriptions and Default Settings.............................................................................. 12

4 Connector Descriptions.................................................................................................... 12

5 J1 Parallel Data Connector ............................................................................................... 13

6 J4 and J2 Power Connectors............................................................................................. 13

Trademarks

Microsoft, Windows are registered trademarks of Microsoft Corporation.

All other trademarks are the property of their respective owners.

*Unpopulated components

TSW1400EVM Interface

DAC Buffers

Control

Interface

J9*

5 VA

AGND

-5 VA

3.3 V (DVDD)

DGND

Amplifier

Interface

Transformer

Interface

D[0-15]

J3*

Overview

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DAC90x Evaluation Module

1 Overview

The DAC90xEVM is an evaluation module (EVM) designed to evaluate the DAC90x. The EVM provides

simple and minimal external components to minimize system cost and power consumption. The

DAC90xEVM is designed to work seamlessly with the TSW1400EVM, data capture and pattern generator

module. The TSW1400EVM is programed through TI's High-Speed Data Converter Pro Graphic User

Interface (HSDC Pro GUI) software tool for high-speed data converter evaluation.

Figure 1. DAC90xEVM Block Diagram

1.1 Required Hardware

The following equipment is included in the EVM evaluation kit:

• DAC90xEVM

The following list of equipment are items that are not included in the EVM evaluation kit but are items

required for evaluation of this product in order to achieve the best performance:

•TSW1400EVM Data Capture Board, +5 V DC cable connector and mini-USB cable

• Computer running Microsoft®Windows®8, Windows 7, or Windows XP

• One dual-channel pulse generator.

– Examples: Keysight 81160A, 81134A, 8133a, or similar.

• Triple-output DC power supply. Recommendations:

– DC Power Supply, Output 1: 30W,6V,5A.Output 2: 25 W, 25 V, 1 A, Output 3: 25 W, –25 V, 1

– Examples: Keysight E3631A or equivalent

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Overview

SLAU726–August 2017

DAC90x Evaluation Module

• Signal path cables, SMA or BNC with BNC-to-SMA adapters

• One of the following (depending on the requirements of the user)

– Spectrum Analyzer. Example: Agilent E4440A

– Oscilloscope: Example: Agilent DSO3052T

1.2 Required Software

The following software is required to operate the TSW1400EVM and is available online. See References,

Section 1.4 for links.

• High-Speed Data Converter Pro software version 4.7

1.3 Evaluation Board Feature Identification Summary

The EVM features are labeled in Figure 2.

Figure 2. EVM Feature Locations

1.4 References

• DAC90x data sheet (SBAS093), available at www.ti.com/product/DAC900

• TSW1400EVM User’s Guide (SLWU079), available at www.ti.com/tool/TSW1400EVM

• High-Speed Data Converter Pro software (SLWC107) and User's Guide (SLWU087), available at

www.ti.com/tool/dataconverterpro-sw

NOTE: Schematics, layout, and BOM are available on each EVM tool page on www.ti.com:

•DAC900EVM

•DAC902EVM

•DAC904EVM

•DAC908EVM

Quick-Start Guide

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DAC90x Evaluation Module

2 Quick-Start Guide

This section guides the user through the EVM test procedure to obtain a valid data capture from the

DAC90xEVM using the TSW1400EVM capture card. This should be the starting point for all evaluations.

2.1 Software Installation

The proper software must be installed before beginning evaluation. See Section 1.2 for a list of the

required software. The References section of this document contains links to find the software on the TI

website.

Important: The software must be installed before connecting the DAC90xEVM and TSW1400EVM to the

computer for the first time.

2.1.1 High-Speed Data Converter Pro GUI Installation

The High-Speed Data Converter Pro (HSDC Pro) is used to control the TSW1400EVM and analyze the

captured data. See High Speed Data Converter Pro GUI for more information.

1. Download HSDC Pro from the TI website. The References section of this document contains the link to

find the software on the TI website.

2. Extract the files from the zip file.

3. Run setup.exe and follow the installation prompts.

PC Running

HSDC Pro

5 VDC

Spectrum Analyzer

Dual-Channel

Pulse Generator

Triple-Output DC

Power Supply

Mini USB

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Quick-Start Guide

SLAU726–August 2017

DAC90x Evaluation Module

2.2 Hardware Setup Procedure

A typical test setup using the DAC90xEVM and TSW1400EVM is shown in Figure 3. This is the test setup

used for the quick-start procedure. The rest of this section describes the hardware setup steps.

Figure 3. Quick-Start Test Setup

2.2.1 TSW1400EVM Setup

Set up the TSW1400EVM with the following steps:

1. Connect the DAC90xEVM to the TSW1400EVM by connecting pin 1 of the CMOS_INTERFACE (J1) to

pin 1 of the DAC90xEVM output data (J1).

2. Connect the power cable to connector J12 (+5 V IN) to the TSW1400EVM.

3. Connect the mini-USB cable to the USB connector (J5).

4. Turn on the power supply. Flip the power switch (SW7) to the ON position. The board should draw

around 0.5 A after power up. This will increase to around 1.7 A when loaded with firmware.

Quick-Start Guide

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DAC90x Evaluation Module

2.2.2 DAC90xEVM Setup

Continue the hardware setup of the DAC90xEVM using the following:

1. Connect the power supply cables to the EVM. refer to Figure 2 and Table 6 for proper connections.

Figure 4. Power Supply Connections

2. Connect the SMA connector from the pulse generator to the EXT Clock input (J5).

3. Turn on the power supply.

4. Connect an SMA cable from the output of the DAC90xEVM (J6) to the input of the spectrum analyzer.

2.3 Software Setup Procedure

The software can be opened and configured once the hardware is properly setup.

2.3.1 HSDC Pro GUI Configuration

1. Open High Speed Data Converter Pro by going to Start Menu →All Programs →Texas Instruments →

High Speed Data Converter Pro. The GUI main page looks as shown in Figure 5.

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Quick-Start Guide

SLAU726–August 2017

DAC90x Evaluation Module

Figure 5. HSDC Pro GUI Main Panel

2. When prompted to select the capture board, select the TSW1400. If multiple TSW1400EVMs are

connected, choose the serial number that corresponds to the serial number on the TSW1400EVM

connected to the DAC90x and click OK. This popup can be accessed through the Instrument Options

menu.

3. If no firmware is currently loaded, there is a message indicating this. Click OK.

4. Verify the DAC tab at the top of the GUI is selected.

5. Use the Select DAC drop-down menu at the top left corner to select the correct configuration file for

the DAC90x variant being used, see Table 1.

Table 1. Configuration Files

DAC90xEVM Variant Configuration File

DAC900 CMOS_10_Bit

DAC902 CMOS_12_Bit

DAC904 CMOS_14_Bit

DAC908 CMOS_8_Bit

6. When prompted to update the firmware for the DAC, click Yes and wait for the firmware to download to

the TSW1400. This takes approximately 10 seconds.

7. Enter “150M” into the "Data Rate (SPS)" field at the upper portion of the DAC tab, and ensure that

"offset Bin" is selected for "DAC Option".

8. In the lower left corner of the HSDC Pro window, enter the following parameters into the I/Q Multitone

generator:

• ToneBW = 0

• # = 1

• Tone Center = 27.4

9. Click the Create Tones button

10. The result should be now visible on the oscilloscope or spectrum analyzer. If performance is not

meeting data sheet specifications, it may be necessary to provide a delay on the clock signal to the

DAC in order to meet setup and hold time requirements. If no output is seen, then see Quick Start

Troubleshooting.

Quick-Start Guide

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DAC90x Evaluation Module

2.4 Quick-Start Troubleshooting

Use Table 2 to assist with problems that may have occurred during the quick-start procedure.

Table 2. Troubleshooting Tips

Issue Troubleshooting Tips

General problems Verify the test setup shown in Section 2 and repeat the setup procedure as described in

this document.

Check power supplies to the EVMs. Verify that the power switches are in the ON position

and supplies are drawing the appropriate current.

Check signal and clock connections to the EVM.

Check that all boards are properly connected together.

Try power-cycling the external power supply to the EVMs.

TSW1400 LEDs are not correct:

D2 – D9 OFF Verify the settings of the configuration switches on the TSW1400EVM.

Verify that the EVM configuration GUI is communicating with the USB and that the

configuration procedure has been followed.

Try capturing data in HSDC Pro to force an LED status update.

HSDC Pro software is not

capturing good data or analysis

results are incorrect.

Verify that the TSW1400EVM is properly connected to the PC with a mini-USB cable and

that the board serial number is properly identified by the HSDC Pro software.

Check that the proper DAC device is selected, and the proper configuration file is being

used.

Check that the analysis parameters are properly configured.

HSDC Pro software gives a time-

out error when capturing data Restart HSDC Pro and reload the firmware.

Verify that the data rate is correct in the HSDC Pro software.

Sub-optimal measured

performance Adjust the delay time of DAC clock.

Measure test points to verify operating voltage ranges.

Verify jumper configurations are in default locations.

Verify that filters are used in the clock and input signal paths and that low-noise signal

sources are used.

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Alternate Hardware Configurations

SLAU726–August 2017

DAC90x Evaluation Module

3 Alternate Hardware Configurations

This section describes alternate hardware configurations in order to achieve better results or to more

closely mimic the system configuration.

Figure 6. Reconfiguration Hardware Location

3.1 Control Modes

The INT/EXT, REFin and FSA pins of the DAC904, DAC902, DAC900, and DAC908 control various DAC

features and functions. This section describes the function of these pins.

3.1.1 FSA Input Pin

For an output current of 20 mA, the potentiometer R14 value is typically set to 2 kΩ. Owing to the fact that

the maximum full-scale current is 20 mA when IOUT1 and IOUT2 are terminated into 50-Ωload resistors,

the voltage at J8 and J9 is 1 V.

3.1.2 INT/EXT Pin

The internal 1.2-V Vref is selected when the INT/EXT pin is grounded (W3 pins 2 and 3 shorted). When

the INT/EXT pin is tied to 5 V ( W3 pins 2 and 3 shorted) and the W4 jumper is in place, the external 1.2-V

Vref is selected.

DAC Clock

CLKOUT

DAC

J1-33

Alternate Hardware Configurations

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3.1.3 REFin Pin

An external reference voltage is provided via the REFin input pin. U7 or U8 is used to generate the

external reference voltage. Jumper W4 is for selecting the external reference voltage.

3.2 External Clock Generation

When connected to an AVDD supply of 5 V and DVDD supply of 5 V, the maximum operating speed of

the DAC90x is 200 MHz. When the DVDD supply is 3.3 V, the maximum clock speed is 165 MHz. The

clock signal comes from either the DSP CLKOUT signal or from an external source via J5. The

DAC90xEVM requires an external clock source when used with the TSW1400EVM.

Figure 7. External Clock Signal

3.3 Analog Output Circuits

The analog signal output of the DAC90x can be configured to drive a resistive load, a transformer, an

operational amplifier, or other output configuration, as long as the limitations set by the output voltage

compliance and full-scale range are not exceeded.

3.3.1 Transformer-Coupled Output

The optimum dynamic performance of the DAC90x is achieved with the outputs used differentially. The

DAC90xEVM is configured to operate with transformer output coupling by default. The 1:1 RF transformer

is used for impedance matching, dc isolation, and interfacing between the differential outputs of the DAC

and an external single-ended device. The resistors R23, R24, and R29 are used to form a network that

reflects 50 Ωacross the primary circuit (J6).

A spectrum analyzer with 50-Ωinput impedance is normally used to measure the performance of the DAC.

A 50-Ωcoaxial cable is used to connect J6 output to the 50-Ωinput of the spectrum analyzer. The

spectrum analyzer impedance is in parallel to the transformer 50-Ωreflected impedance across J6.

Therefore, the voltage at the input of the spectrum analyzer is ½ J6. If a larger voltage is required, use a

1:2 step up voltage ratio transformer to produce twice the voltage at J6. In addition set R23 to 200 Ωand

remove R24 and R29. R14 may require some adjustments.

3.3.2 Direct Output

Direct output configuration allows the user to connect the outputs of the DAC90x directly to external

circuitry. This configuration requires that J8 and J9 be installed by the user. A 1-V output will appear at J8

and J9 when IOUT1 and IOUT2 are terminated into 50-Ωexternal resistor loads (output taken from J8 and

J9 and W6 and W7 open).

3.3.3 Operational Amplifier Output

In addition to the transformer-coupled output configuration, the DAC90xEVM offers three more

configurations which use the THS3001 operational amplifier. The THS3001 can be configured as a

difference amplifier, an inverting amplifier, and a non-inverting amplifier.

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