Analog Devices UG-447 Manual de usuario

Evaluation Board User Guide

UG-447

One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: 781.329.4700 •Fax: 781.461.3113 •www.analog.com

Evaluation Board for the AD7091 Analog-to-Digital Converter

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 16

FEATURES

Full-featured evaluation board for the AD7091

On-board power supplies

Standalone capability

PC control in conjunction with system demonstration

platform (EVAL-SDP-CB1Z)

PC software for control and data analysis

ONLINE RESOURCES

Evaluation kit contents

EVAL-AD7091SDZ evaluation board

Evaluation software CD for the AD7091

Documents needed

AD7091 data sheet

EVAL-AD7091SDZ user guide

Required software

EVAL-AD7091SDZ evaluation software

Design and integration files

Schematics, layout files, bill of materials

EQUIPMENT NEEDED

EVAL-AD7091SDZ evaluation board

EVAL-SDP-CB1Z system demonstration platform

External 7 V to 9 V power supply

AC or dc signal source

USB cable

PC running Windows with USB 2.0

SMB cable

GENERAL DESCRIPTION

The E VA L -AD7091SDZ is a full-featured evaluation board

designed to allow the user to easily evaluate all features of the

AD7091 analog-to-digital converter. A 7 V to 9 V external

bench top supply is regulated to ±5 V and 3.3 V to supply the

AD7091 and support all necessary components. The E VA L -

AD7091SDZ board connects to the USB port of the PC by

connecting to the E VA L -SDP-CB1Z motherboard.

The E VA L -AD7091SDZ software provides dynamic perform-

ance analysis in the form of waveform graphs, histograms, and

FFT analysis for ADC performance evaluation.

On-board components include the AD8031 high speed precision

rail-to-rail op amp, the AD8032 high speed precision rail-to-rail

dual op amp, the ADP3303 high accuracy 200 mA, low dropout,

linear regulator, and the ADP7104 adjustable low noise 500 mA

low dropout linear regulator. Other on-board components include

the ADG3308 bidirectional logic level translator, the REF196 3.3 V

precision voltage reference, the ADM1185 quad voltage monitor

and sequencer, and the ADP1613 step-up dc-to-dc switching

converter.

FUNCTIONAL BLOCK DIAGRAM

Figure 1. EVAL-AD7091SDZ Block Diagram

JACK

AD7091

CONVST

SDO

SCLK

SDP BOARD

ADSP-BF527

DSP

GND

ON-BOARD

POWER SUPPLIES

+5V, –5V, +3.3V, REF

VCC

VIN

GND

BIAS UP

BIPOLAR_IN UNIPOLAR_OUT

VDDGND GND +AMP–AMP

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UG-447 Evaluation Board User Guide

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TABLE OF CONTENTS

Features .............................................................................................. 1

Online Resources.............................................................................. 1

Equipment Needed........................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

E VA L -AD7091SDZ Quick Start Guide........................................... 3

Evaluation Board Hardware ............................................................ 4

Device Description....................................................................... 4

Hardware Link Options............................................................... 4

Power Supplies .............................................................................. 4

Sockets/Connectors...................................................................... 5

Test Poi nts...................................................................................... 5

E VA L -AD7091SDZ Basic Hardware Setup ................................ 6

Evaluation Board Software...............................................................7

Software Installation .....................................................................7

Launching the Software................................................................8

Description of Main Software Window .................................. 10

Waveform Capture ..................................................................... 10

AC Testing—Histogram ............................................................ 12

DC Testing—Histogram............................................................ 12

AC Testing—FFT Capture ........................................................ 13

Summary Tab.............................................................................. 14

Save File ....................................................................................... 15

Open File ..................................................................................... 15

Evaluation Board Schematics and Ordering Information ........ 16

Ordering Information................................................................ 16

REVISION HISTORY

2/13—Revision 0: Initial Version

Evaluation Board User Guide UG-447

Rev. 0 | Page 3 of 16

EVAL-AD7091SDZ QUICK START GUIDE

Follow these steps to quickly evaluate the AD7091:

1. Install the E VA L -AD7091SDZ software from the enclosed

CD. Ensure that the E VA L -SDP-CB1Z board is discon-

nected from the USB port of the PC while installing the

software. The PC may need to be restarted after the

installation.

2. Ensure that the default link options are configured as

outlined in Table 2.

3. Connect the E VA L -SDP-CB1Z board to the E VA L -

AD7091SDZ shown in Figure 2.

4. Screw the two boards together with the enclosed nylon

screw/nut set to ensure that the boards connect firmly

together.

5. Connect the power supply adapter included in the kit to

Connecter J700 on the E VA L -AD7091SDZ board.

6. Connect the E VA L -SDP-CB1Z board to the PC via the

USB cable. For Windows® XP, you may need to search for

the E VA L -SDP-CB1Z drivers. Choose to automatically

search for the drivers for the EVA L-SDP-CB1Z board if

prompted by the operating system.

7. Launch the AD7091(R) software from the Analog Devices

subfolder in the Programs menu.

8. If the input signal is unipolar, proceed to Step 9.

Otherwise, connect a bipolar input signal via the BIPOLAR

IN connector, J3. A unipolar signal is then available at the

BIPOLAR OUT connector, J4.

9. Connect a unipolar input signal via the VIN connector, J2.

10. Press the SAMPLE button to initiate a measurement.

Figure 2. Hardware Configuration—Setting Up the EVAL-AD7091SDZ

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UG-447 Evaluation Board User Guide

Rev. 0 | Page 4 of 16

EVALUATION BOARD HARDWARE

DEVICE DESCRIPTION

This user guide describes the evaluation board for the AD7091

analog-to-digital converter.

The AD7091 is a 12-bit, ultralow power, successive approximation

ADC. The AD7091 operates from a single 2.09 V to 5.25 V

power supply and is capable of achieving a throughput rate of

1 MSPS. The AD7091 also features an on-chip conversion clock

and a high speed serial interface.

The conversion process and data acquisition are controlled

using a CONVST signal and an internal oscillator. The AD7091

has a serial interface allowing data to be read after the conver-

sion, while achieving a 1 MSPS throughput rate. The AD7091

uses advanced design and process techniques to achieve

ultralow power dissipation at high throughput rates. The

reference is taken internally from VDD.

Complete specifications for the AD7091 are provided in the

AD7091 data sheet, available from Analog Devices, which

should be consulted in conjunction with this user guide when

using the evaluation board.

Full details on the E VA L -SDP-CB1Z are available at online.

HARDWARE LINK OPTIONS

The functions of the link options are described in Table 2.

The default setup is configured to operate the board with

the main power supply adapter and to interface to the

E VA L-SDP-CB1Z board.

POWER SUPPLIES

Care should be taken before applying power and signals to

the evaluation board to ensure that all link positions are set

according to the required operating mode. See Table 2 for the

complete list of link options.

This evaluation board is supplied with a wall-mountable

switching power supply that provides a 9 V dc output. Connect

the supply to a 100 V to 240 V ac wall outlet at 50 Hz to 60 Hz.

The output from the supply is provided through a 2.0 mm inner

diameter jack that connects to the evaluation board at J700. The

9 V supply is connected to the on-board 3.3 V linear regulator

that supplies the correct supply voltage to the board and the

E VA L-SDP-CB1Z board.

If the evaluation board is used without the 9 V adapter, an

external power supply in the range of 7 V to 9 V must be

connected to the J701 connector. When using this evaluation

board with the E VA L -SDP-CB1Z board, it is necessary to power

the board through the J700 or J701 connector.

If supplies other than the on-board 3.3 V are required, an

external power supply in the range of 2.09 V to 5.25 V must be

connected to the VDD input via J702 to supply the AD7091 VDD

pin. Additionally, +5 V and −5 V should be supplied to

connector J800 to supply the on-board amplifier circuits.

Each supply is decoupled on this board using 10 µF tantalum

and 100 nF multilayer ceramic capacitors.

Table 1. External Power Supplies Ranges

Power

Supply Voltage Range Purpose

DC Jack 9 V ± 5% Supplies power to on-board

power management devices

VCC 7 V to 9 V Supplies power to on-board

power management devices

+AMP

5 V ± 10%

Amplifier positive supply rail

−AMP −5 V ± 10% Amplifier negative supply rail

VDD 2.09 V to 5.25 V Digital supply rail without EVAL-

SDP-CB1Z connected

3.3 V to 5.25 V Digital supply rail with EVAL-

SDP-CB1Z connected

Evaluation Board User Guide UG-447

Rev. 0 | Page 5 of 16

Table 2. Link Options

Category Link

Default

Position Function

Buffer

Settings

LK1 A This link is used to select the analog signal path.

In Position A, the analog signal is buffered via U2, a unity gain buffer.

In Position B, the analog signal is buffered via U3, a unity gain buffer.

In Position C, the analog signal bypasses U2 and U3.

LK2 A This link is used to select the source of the analog input signal to the AD7091.

In Position A, the analog signal is sourced via the U2 op amp.

In Position B, the analog signal is sourced via the U3 op amp.

In Position C, the analog signal bypasses U2 and U3.

Termination LK3 Inserted Adds a 51 Ω termination resistor to GND at VIN.

Inserted—51 Ω termination on the VIN input.

Not inserted—no 51 Ω termination on the VIN input.

LK4 Inserted Adds a 51 Ω termination resistor to GND at BIPOLAR_IN.

Inserted—51 Ω termination on the BIPOLAR_IN input.

Not inserted—no 51 Ω termination on the BIPOLAR_IN input.

Power

Supplies

LK5 A This link is used to select the reference source for the bias up circuitry.

In Position A, the REF signal is sourced via the on-board reference chip.

In Position B, the REF signal is sourced via VDD.

LK6 A This link is used to select the source of the VDD supply line for the evaluation board

In Position A, the VDD supply is sourced from the on-board 3.3 V supply.

In Position B, the VDD supply is sourced from the external J702 connector.

LK800 A This link is used to select the source of the +OP_AMP supply line for the on-board amplifiers.

In Position A, the +OP_AMP supply is sourced from the on-board supply.

In Position B, the +OP_AMP supply is sourced from the external J800 connector.

LK801 A This link is used to select the source of the −OP_AMP supply line for the on-board amplifiers.

In Position A, the −OP_AMP supply is sourced from the on-board supply.

In Position B, the −OP_AMP supply is sourced from the external J800 connector.

SOCKETS/CONNECTORS

The connectors and sockets on the E VA L -AD7091SDZ are

outlined in Table 3.

The default interface to this evaluation board is via the 120-way

connector, which connects the E VA L -AD7091SDZ to the EVA L -

SDP-CB1Z board.

TEST POINTS

There are numerous test points on the E VA L -AD7091SDZ

board. These test points enable the user to have easy access to

the signals from the evaluation board for probing, evaluation,

and debugging.

It is also possible to access the AD7091 via the test points to

operate the E VA L -AD7091SDZ in standalone mode without the

need for the EVA L -SDP-CB1Z board.

Table 3. On-Board Connectors

Connector Function

J1 120-way connector for EVAL-SDP-CB1Z interface

J2 VIN analog input signal

J3 BIPOLAR_IN analog input signal to bias up circuit

J4 UNIPOLAR_OUT output of bias up circuit

J5 External reference voltage connector

J700 9 V, 2.0 mm dc jack connector

J701

External VCC and GND power connector

J702 External VDD and GND power connector

J800 Amplifier power connector

UG-447 Evaluation Board User Guide

Rev. 0 | Page 6 of 16

EVAL-AD7091SDZ BASIC HARDWARE SETUP

The E VA L -AD7091SDZ board connects to the E VA L -SDP-

CB1Z system demonstration platform board. The E VA L -

AD7091SDZ board is the controller board, which is the

communication link between the PC and the main evaluation

board. Figure 2 shows a photograph of the connections between

the E VA L -AD7091SDZ daughter board and the E VA L -SDP-

CB1Z board.

The analog input range to the AD7091is 0 V to VDD and should

not be exceeded. When using the on-board supplies, VDD is

3.3 V. An input signal in the range of 3.3 V p-p should be

connected to the E VA L -AD7091SDZ board via VIN. An on-

board unity gain amplifier buffers the signal to the AD7091.

This is the default configuration on the EVAL-AD7091SDZ.

If the input signal is bipolar, it should be connected to the

BIPOLAR_IN, the J3 connector. This signal is biased to 1.65 V

via the bias up circuitry on the E VA L -AD7091SDZ and is

available at the UNIPOLAR_OUT connector, J4. The

UNIPOLAR_OUT signal can then be connected to VIN

connector.

Before connecting power, connect the E VA L -AD7091SDZ

board to Connector A on the EVA L-SDP-CB1Z board. A nylon

screw/nut set is included in the E VA L -AD7091SDZ kit and can

be used to ensure that the E VA L -AD7091SDZ and E VA L -SDP-

CB1Z boards are connected firmly together.

Ensure that the link options are in the default positions as

outlined in Table 2.

After the EVA L -AD7091SDZ board and the E VA L -SDP-CB1Z

board are connected securely, connect the power to the E VA L -

AD7091SDZ board. The E VA L -AD7091SDZ board requires

an external power supply adapter, which is included in the

evaluation board kit. Connect this power supply to Connector

J700 on the E VA L -AD7091SDZ board. For further details on the

required power supply connections and options, see the Power

Supplies section.

Before connecting the E VA L -SDP-CB1Z board to your PC,

ensure that the E VA L -AD7091SDZ software has been installed

from the enclosed CD. The full software installation procedure

is detailed in the Evaluation Board Software section.

Finally, connect the E VA L -SDP-CB1Z board to the PC via the

USB cable enclosed in the E VA L -SDP-CB1Z kit. If using a

Windows XP platform, you may need to search for the E VA L -

AD7091SDZ drivers. Choose to automatically search for the

drivers for the E VA L -SDP-CB1Z board if prompted by the

operating system.

Evaluation Board User Guide UG-447

Rev. 0 | Page 7 of 16

EVALUATION BOARD SOFTWARE

SOFTWARE INSTALLATION

The E VA L -AD7091SDZ kit includes software on a CD. Double-

click the setup.exe file from the CD to run the install. The

default location for the software is

C:\Program Files\Analog Devices\AD7091(R)\

Install the evaluation software before connecting the evaluation

board and the E VA L -SDP-CB1Z board to the USB port of the

PC to ensure that the evaluation system is correctly recognized

when connected to the PC.

There are two parts to the installation are as follows:

•E VA L -AD7091SDZ board software installation

•E VA L-SDP-CB1Z system demonstration platform board

drivers installation

Follow Step 1 to Step 4 (see Figure 3 to Figure 7) to install the

E VA L -AD7091SDZ software. Follow Step 5 to Step 8 (see

Figure 8 to Figure 11) to install the E VA L -SDP-CB1Z drivers.

Proceed through all of the installation steps, allowing the

software and drivers to be placed in the appropriate locations.

Connect the E VA L -SDP-CB1Z board to the PC only after the

software and drivers have been installed.

Figure 3. EVAL-AD7091SDZ Installation—User Account Control

1. Click Ye s to begin the installation process.

Figure 4. EVAL-AD7091SDZ Installation—Destination Directory

2. A license agreement appears. Read the agreement and then

select I accept the License Agreement and click Next.

Figure 5. EVAL-AD7091SDZ Evaluation Software Installation:

3. Select the installation directory. Click Next.

Figure 6. EVAL-AD7091SDZ Installation—Start Installation

4. Click Next to install the software.

Figure 7. EVAL-AD7091SDZ Installation—Installation Complete

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UG-447 Evaluation Board User Guide

Rev. 0 | Page 8 of 16

5. When the evaluation software installation is complete, click

Next to proceed with the installation of the drivers.

Figure 8. EVAL-SDP-CB1Z Drivers Installation—Setup Wizard

6. The setup wizard opens. Click Next to begin the driver

installation process.

Figure 9. EVAL-SDP-CB1Z Drivers Installation—Choose Install Location

7. Select a destination folder for the SDP drivers, and click

Install.

Figure 10. EVAL-SDP-CB1Z Drivers Installation—Windows Security

8. Click Install to proceed with the installation.

Figure 11. EVAL-SDP-CB1Z Drivers Installation—Complete

9. Click Finish.

After installation from the CD is complete, connect the E VA L -

AD7091SDZ board to the E VA L -SDP-CB1Z board as described

in the Evaluation Board Hardware section.

When you first plug in the EVA L -SDP-CB1Z board via the USB

cable provided, allow the Found Hardware Wizard to run.

After the drivers are installed, you can check that the board is

connected correctly by looking at the Device Manager of the

PC. The Device Manager can be found by right-clicking My

Computer > Manage > Device Manager from the list of

Sy stem Tools, as shown in Figure 12. The E VA L -SDP-CB1Z

SDP-B board should appear under ADI Development Tools.

This completes the installation.

Figure 12. Device Manager

LAUNCHING THE SOFTWARE

After the E VA L -AD7091SDZ and E VA L -SDP-CB1Z boards

are correctly connected to your PC, the E VA L -AD7091SDZ

software can be launched.

To launch the software, perform the following steps:

1. From the Start menu, select Programs >Analog Devices >

AD7091(R) > AD7091(R). The main window of the

software then opens (see Figure 13).

2. If the E VA L -AD7091SDZ board is not connected to the

USB port via the EVA L -SDP-CB1Z when the software

is launched, a connectivity error displays (see Figure 14).

Connect the evaluation board to the USB port of the PC,

wait a few seconds, click Rescan, and follow the instructions.

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Evaluation Board User Guide UG-447

Rev. 0 | Page 9 of 16

Figure 13. Evaluation Software Main Window

Figure 14. Connectivity Error Alert

1. MENU BAR.

2. CONTROL BUTTONS.

3. DATA CAPTURE DISPLAY.

10922-014

10922-013

UG-447 Evaluation Board User Guide

Rev. 0 | Page 10 of 16

DESCRIPTION OF MAIN SOFTWARE WINDOW

The following tools allow user control of the different chart

displays. When the software is launched, the main software

window opens (see Figure 13).

The user software panel as shown in Figure 13 has the following

features:

•Menu bar

•Control buttons

•Data capture display

Menu Bar

The menu bar consists of the File and Help menus.

File Menu

Open (Sample Data). Loads previously captured data in tab

separated values (TSV) format for analysis.

Save (Sample Data). Saves captured data in TSV format for

future analysis.

Print Front Panel Picture. Prints the software window

displayed.

Save As Picture. Saves the front panel as a JPEG file.

Exit. Exits the program.

Help Menu

Open analog.com. Opens www.analog.com.

Control Buttons

The E VA L -AD7091SDZ software includes control buttons,

drop-down boxes, and indicators.

Device Selection. Selects the AD7091 or AD7091R device.

Voltage Range. Indicates the onboard reference voltage. This is

dependent on the Device Selection.

Mode. Selects the operating mode of the AD7091. In Normal

mode, the ADC is ready to acquire samples. In Sleep mode, the

device enters power-down mode when the SAMPLE button is

clicked.

Sampling rate. Selects the sampling rate of the data acquisition.

# Samples. Selects the number of samples to be completed in a

single acquisition.

SAMPLE. Initiates the sampling and readback of the defined

number of measurements.

CONTINUOUS. Performs a continuous capture from the

ADC. Click a second time to stop sampling.

FLASH LED. Causes the orange LED1A on the SDP board to

flash, which can be a useful debugging tool.

STOP. Stops the program.

Data Capture Display

There are four tabs that display the conversion data in different

formats: Wav e form , Histogram, FFT, and Summary.

The tools shown in Figure 15 allow user control of the different

chart displays.

Figure 15. Chart Tools

WAVEFORM CAPTURE

Figure 16 illustrates the waveform capture tab.

The waveform analysis reports the amplitudes recorded from

the captured signal in addition to the frequency of the

signal tone.

123

1. USED FOR CONTROLLING THE

CURSOR IF PRESENT.

2. USED FOR ZOOMING IN AND OUT.

3. USED FOR PLANNING.

10922-015

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