Analog Devices EVAL-AD7276SDZ Manual de usuario

EVAL-AD7276SDZ User Guide

UG-450

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

Evaluating the AD7276, 3 MSPS, 12-Bit ADC

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.Rev. 0 | Page 1 of 20

FEATURES

Full featured evaluation board for the AD7276

PC control in conjunction with the system demonstration

platform (EVAL-SDP-CB1Z)

PC software for control and data analysis (time and

frequency domain)

Standalone capability

EVALUATION KIT CONTENTS

EVAL-AD7276SDZ evaluation board

Evaluation software CD for the AD7276

9 V mains power supply adapter

ADDITIONAL EQUIPMENT NEEDED

EVAL-SDP-CB1Z system demonstration platform, includes a

USB cable

Precision analog signal source

SMB cables

PC running Windows XP SP2, Windows Vista, or Windows 7

with USB 2.0 port

ONLINE RESOURCES

Documents

AD7276 data sheet

EVAL-AD7276SDZ user guide

Required Software

EVAL-AD7276SDZ evaluation software

GENERAL DESCRIPTION

The EVAL-AD7276SDZ is a full featured evaluation board that can

be used to easily evaluate all features of the AD7276. The AD7276

is a 12-bit, high speed, low power successive approximation ADC.

The part operates from a single 2.35 V to 3.6 V power supply and

features throughput rates of up to 3 MSPS. The part contains a

low noise, wide bandwidth track-and-hold amplifier that can

handle input frequencies greater than 55 MHz.

The evaluation board can be controlled via the system demon-

stration platform (SDP). The E VA L -SDP-CB1Z board allows

the evaluation board to be controlled via the USB port of a PC

using the AD7276 evaluation software. The EVA L-AD7276SDZ

generates all required power supplies on board and supplies power

to the E VAL -SDP-CB1Z controller board. On-board components

include the following:

AD8022: dual high speed, low noise op amp

ADA4000-1: single, low cost, precision JFET input operational

amplifier

AD780: 2.5 V/3.0 V ultrahigh precision band gap voltage

reference

ADP1613: step-up PWM dc-to-dc switching converter

ADP1720: 50 mA, high voltage, micropower linear regulator

ADP7104: 20 V, 500 mA, low noise, CMOS LDO

ADM1185: quad voltage monitor and sequencer

ADG3308: low voltage, 1.15 V to 5.5 V, 8-channel bidirectional

logic level translator

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

–

VCC

VAMP–

VAMP+

GND

VIN

UNBIASED

EVAL-AD7276SDZ

EVAL-SDP-CB1Z

CONTROLLER

BOARD

BF527

DSP

SERIAL

INTERFACE

AD7276

GND

SDATA

SCLK

ADG3308

LEVEL

SHIFTER

OP AMP

SUPPLIES

VIN GND

7V TO

INPUT JACK

VIN

ON-BOARD

POWER SUPPLIES

ADP7104

SDP +5V

ADP1720

+3.3V

ADP1613

±5V

ADM1185

POWER

SEQUENCER

ADA4000-1

BUFFER

ADA4000-1

BUFFER

AD8022

BIAS-UP

CIRCUIT

AD780

REF

48MHz

SCLK

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UG-450 EVAL-AD7276SDZ User Guide

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TABLE OF CONTENTS

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

Evaluation Kit Contents................................................................... 1

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

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

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

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

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

Getting Started .................................................................................. 3

Quick Start Steps .......................................................................... 3

Software Installation Procedures................................................ 4

Evaluation Board Setup Procedures........................................... 7

Evaluation Board Hardware ............................................................ 8

AD7276 Device Description ....................................................... 8

Power Supplies .............................................................................. 8

Link Configuration Options ........................................................... 9

Setup Conditions .......................................................................... 9

Evaluation Board Circuitry........................................................... 11

Analog Inputs ............................................................................. 11

Reference Options...................................................................... 11

Sockets/Connectors ................................................................... 11

Modes of Operation ....................................................................... 12

SDP Controlled Mode ............................................................... 12

Standalone Mode........................................................................ 12

How to Use the Software for Evaluating the AD7276 ............... 13

Setting Up the System for Data Capture ................................. 13

Overview of the Main Window................................................ 15

Generating a Waveform Analysis Report................................ 16

Generating a Histogram of the ADC Code Distribution ..... 17

Generating a Fast Fourier Transform of AC Characteristics ......18

Generating a Summary of the Waveform, Histogram, and

Fast Fourier Transform.............................................................. 19

Related Links................................................................................... 20

REVISION HISTORY

4/13—Revision 0: Initial Version

EVAL-AD7276SDZ User Guide UG-450

Rev. 0 | Page 3 of 20

GETTING STARTED

QUICK START STEPS

To begin using the evaluation board, do the following:

1. With the EVA L-SDP-CB1Z board disconnected from the

USB port of the PC, install the AD7276 evaluation board

software from the CD included in the evaluation board kit.

The PC must be restarted after the software installation is

complete. (For complete software installation instructions,

see the Software Installation Procedures section.)

2. Connect the E VAL -SDP-CB1Z board to the E VAL -

AD7276SDZ board as shown in Figure 2. Screw the two

boards together using the nylon screw-nut set included in

the evaluation board kit to ensure that the boards are

connected firmly together.

3. Connect the 9 V power supply adapter included in the

evaluation board kit to Connector J1 on the E VA L-

AD7276SDZ board.

4. Connect the E VAL -SDP-CB1Z board to the PC using the

supplied USB cable. If you are using Windows® XP, you may

need to search for the E VA L -SDP-CB1Z drivers. Choose to

automatically search for the drivers for the E VA L -SDP-CB1Z

board if prompted by the operating system.

5. Launch the EVAL -AD7276SDZ software from the Analog

Devices subfolder in the Programs menu.

Figure 2. Hardware Configuration—Setting up the EVAL-AD7276SDZ

(EVAL-AD7276SDZ on Left and EVAL-SDP-CB1Z on Right)

9V PSU

EVAL-SDP-CB1Z

USB TO PC

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UG-450 EVAL-AD7276SDZ User Guide

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SOFTWARE INSTALLATION PROCEDURES

The E VA L -AD7276SDZ evaluation kit includes a CD containing

software to be installed on your PC before you begin using the

evaluation board.

There are two parts to the installation:

•AD7276 evaluation board software installation

•EVA L-SDP-CB1Z system demonstration platform board

drivers installation

Warning

The evaluation board software and drivers must be installed

before connecting the evaluation board and E VA L -SDP-CB1Z

board to the USB port of the PC to ensure that the evaluation

system is correctly recognized when it is connected to the PC.

Installing the AD7276 Evaluation Board Software

To install the AD7276 evaluation board software,

1. With the EVA L-SDP-CB1Z board disconnected from the

USB port of the PC, insert the installation CD into the CD-

ROM drive.

2. Double-click the setup.exe file to begin the evaluation

board software installation. The software is installed to the

following default location: C:\Program Files\Analog

Devices\E VA L -AD7276_77_78SDZ\AD7276.

3. A dialog box appears asking for permission to allow the

program to make changes to your computer. Click Yes .

Figure 3. AD7276 Evaluation Board Software Installation:

Granting Permission for Program to Make Changes

4. Select the location to install the software, and then click Next.

Figure 4. AD7276 Evaluation Board Software Installation:

Selecting the Location for Software Installation

5. A license agreement appears. Read the agreement, and then

select I accept the License Agreement and click Next.

Figure 5. AD7276 Evaluation Board Software Installation:

Accepting the License Agreement

10941-003

10941-004

10941-005

EVAL-AD7276SDZ User Guide UG-450

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6. A summary of the installation is displayed. Click Next to

continue.

Figure 6. AD7276 Evaluation Board Software Installation:

Reviewing a Summary of the Installation

7. A dialog box informs you when the installation is

complete. Click Next.

Figure 7. AD7276 Evaluation Board Software Installation:

Indicating When the Installation Is Complete

Installing the EVAL-SDP-CB1Z System Demonstration

Platform Board Drivers

After the installation of the evaluation board software is complete,

a welcome window is displayed for the installation of the EVAL -

SDP-CB1Z system demonstration platform board drivers.

1. With the EVA L-SDP-CB1Z board still disconnected from

the USB port of the PC, make sure that all other applications

are closed, and then click Next.

Figure 8. EVAL-SDP-CB1Z Drivers Setup:

Beginning the Drivers Installation

2. Select the location to install the drivers, and then click Next.

Figure 9. EVAL-SDP-CB1Z Drivers Setup:

Selecting the Location for Drivers Installation

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10941-007

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UG-450 EVAL-AD7276SDZ User Guide

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3. Click Install to confirm that you would like to install the

drivers.

Figure 10. EVAL-SDP-CB1Z Drivers Setup:

Granting Permission to Install Drivers

4. To complete the drivers installation, click Finish, which

closes the installation wizard.

Figure 11. EVAL-SDP-CB1Z Drivers Setup:

Completing the Drivers Setup Wizard

5. Before using the evaluation board, you must restart your

computer. A dialog box opens, giving you the following

options: Restart, Shut Down, Restart Later. Click the

appropriate button.

Figure 12. EVAL-SDP-CB1Z Drivers Setup:

Restarting the Computer

10941-010

10941-011

10941-012

EVAL-AD7276SDZ User Guide UG-450

Rev. 0 | Page 7 of 20

EVALUATION BOARD SETUP PROCEDURES

The AD7276 evaluation board connects to the EVA L -SDP-

CB1Z system demonstration board. The E VA L -SDP-CB1Z

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 made between the AD7276

daughter board and the E VA L -SDP-CB1Z board.

After following the instructions in the Software Installation

Procedures section, set up the evaluation and SDP boards as

detailed in this section.

Warning

The evaluation software and drivers must be installed before con-

necting the evaluation board and E VAL -SDP-CB1Z board to

the USB port of the PC to ensure that the evaluation system is

correctly recognized when it is connected to the PC.

Configuring the Evaluation and SDP Boards

1. Connect the E VAL -AD7276SDZ board to Connector A or

Connector B of the EVAL -SDP-CB1Z board (see Figure 2).

a. Screw the two boards together using the nylon screw-

nut set included in the evaluation board kit to ensure

that the boards are connected firmly together.

2. Connect the 9 V power supply adapter included in the evalu-

ation board kit to Connector J1 of the EVA L-AD7276SDZ

board. (Alternatively, a bench power supply can be used to

power the EVA L-AD7276SDZ via Connector J2. See Table 1

for more information about the connections and options

for the required power supplies.)

3. Connect the E VAL -SDP-CB1Z board to the PC using the

supplied USB cable.

UG-450 EVAL-AD7276SDZ User Guide

Rev. 0 | Page 8 of 20

EVALUATION BOARD HARDWARE

AD7276 DEVICE DESCRIPTION

The AD7276 can interface to microprocessors or DSPs.

The input signal is sampled on the falling edge of CS, and the

conversion is also initiated at this point. There are no pipeline

delays associated with the part.

The AD7276 uses advanced design techniques to achieve very

low power dissipation at high throughput rates.

The reference for the part is taken internally from VDD. This

allows the widest dynamic input range to the ADC; therefore,

the analog input range for the part is 0 V to VDD. The conversion

rate is determined by the SCLK.

For more information about the AD7276, refer to the AD7276 data

sheet, which should be used in conjunction with this user guide.

POWER SUPPLIES

The E VA L -AD7276SDZ can be used in two modes: SDP

controlled mode and standalone mode (see the Modes of

Operation section for more information).

When the E VA L -AD7276SDZ board is used in conjunction with

the EVA L-SDP-CB1Z board (SDP controlled mode), connect the

ac transformer to Connector J1 on the E VA L -AD7276SDZ

board. The VDD, +AMP, and −AMP supplies are generated on

board. When the E VAL -AD7276SDZ board is used in standalone

mode, the VDD and amplifier supplies must be sourced from

external sources (see Table 1).

Alternatively, a bench power supply can be connected to J2 to

supply 7 V to 9 V.

Table 1. External Power Supplies Required

Power Supply Connector Voltage Range Purpose

VIN1 J1 or J2 7 V to 9 V Supplies all on-board power supplies, generating all required voltages to run the

evaluation board

+AMP J3-3 +5 V Supplies the positive rail of the amplifier

−AMP J3-1 −5 V Supplies the negative rail of the amplifier

VDD J4 2.35 V to 3.6 V Supplies the VDD digital supply

1When VIN is supplied, all other power supplies are available on board. If the VIN supply is not used, all other power supplies must be sourced from an external source.

EVAL-AD7276SDZ User Guide UG-450

Rev. 0 | Page 9 of 20

LINK CONFIGURATION OPTIONS

There are multiple jumper (LKx) options that must be set

correctly to select the appropriate operating setup before you

begin using the evaluation board. The functions of these

options are outlined in Table 2.

SETUP CONDITIONS

Care should be taken before applying power and signals to the

evaluation board to ensure that all link positions are as required

by the operating mode. There are two modes in which to operate

the evaluation board. The evaluation board can be operated in

SDP controlled mode to be used with the SDP board, or the

evaluation board can be used in standalone mode.

Table 3 shows the default positions in which the links are set when

the evaluation board is packaged. When the board is shipped, it

is assumed that you are going to operate the evaluation board

with the SDP board (SDP controlled mode).

Table 2. Link Option Functions

Link No. Function

LK1 −AMP. Amplifier negative voltage supply selection.

Position A: the amplifier negative voltage is supplied from the on-board supply.

Position B: the amplifier negative voltage is supplied from an external source via J3 Terminal 1.

LK2 +AMP. Amplifier positive voltage supply selection.

Position A: the amplifier positive voltage is supplied from the on-board supply.

Position B: the amplifier positive voltage is supplied from an external source via J3 Terminal 3.

LK3 Bias-up voltage selection. Selects the voltage level that is supplied to U4.

Position A: the bias-up voltage level that is supplied to U4 is VDD.

Position B: the bias-up voltage level that is supplied to U4 is 0 V.

LK4 VDD source selection.

Position A: VDD is sourced from U5.

Position B: VDD is sourced externally via J4.

LK5 U5 output voltage selection.

Inserted: the U5 output voltage is 3.0 V.

Removed: the U5 output voltage is 2.5 V.

LK6 VIN unbiased input impedance selection.

Inserted: the VIN unbiased input impedance is 51 Ω.

LK7 CS signal.

Position A: the CS signal is connected to EVAL-SDP-CB1Z.

Position B: the CS signal is connected externally via J6.

LK8 Biased-up input signal.

Inserted: the biased-up input signal is connected to the U7 input buffer.

LK9 SCLK signal.

Position A: the SCLK signal is connected to EVAL-SDP-CB1Z.

Position B: the SCLK signal is connected externally via J8.

LK10 Buffer input source.

Position A: the input signal is connected to the U7 input buffer.

Position B: the input signal connected to the U7 input buffer is set to 0 V.

LK11 VIN input impedance selection.

Inserted: the VIN input impedance is 51 Ω.

LK12 SDATA signal.

Position A: the SDATA signal is connected to EVAL-SDP-CB1Z.

Position B: the SDATA signal is connected externally via J9.

Table 3. Default Link Positions for Packaged EVAL-AD7276SDZ

Link No. Position Function

LK1 A The amplifier negative voltage is supplied from the on-board supply.

LK2

The amplifier positive voltage is supplied from the on-board supply.

LK3 A The selected voltage level that is supplied to U4 is VDD.

LK4 A VDD is sourced from U5.

UG-450 EVAL-AD7276SDZ User Guide

Rev. 0 | Page 10 of 20

Link No. Position Function

LK5 Inserted The U5 output voltage is 3.0 V.

LK6 Inserted The VIN unbiased input impedance is 51 Ω.

LK7 A The CS signal is connected to EVAL-SDP-CB1Z.

LK8 Inserted The biased-up input signal is connected to the U7 input buffer.

LK9 A The SCLK signal is connected to EVAL-SDP-CB1Z.

LK10 A The input signal is connected to the U7 input buffer.

LK11 Inserted The VIN input impedance is 51 Ω.

LK12 A The SDATA signal is connected to EVAL-SDP-CB1Z.

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