Analog Devices UG Series Manuel utilisateur

Evaluation Board User Guide

UG-XXX

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 AD7124-8—

8-Channel, Low Noise, Low Power, 24-bit S-D ADC with In- Amp and Reference

FEATURES

Full featured evaluation board for the AD7124-8

PC control in conjunction with the system demonstration

platform (EVAL-SDP-CB1Z)

PC software for control and data analysis (time domain)

Standalone capability

ONLINE RESOURCES

Evaluation Kit Contents

EVAL-AD7124-8SDZ evaluation board

Evaluation software CD for the AD7124-8

Documents Needed

AD7124-8 data sheet

AD7124-8 user guide

Required Software

EVAL-AD7124-8SDZ evaluation software

EQUIPMENT NEEDED

EVAL-AD7124-8SDZ evaluation board

EVAL-SDP-CB1Z system demonstration platform

DC signal source

USB cable

PC running Windows with USB 2.0 port

GENERAL DESCRIPTION

The E VA L -AD7124-8SDZ evaluation kit features the AD7124-8

24-bit, low power, low noise analog-to-digital converter (ADC).

A 7 V to 9 V external supply is regulated to 3.3 V to supply the

AD7124-8 and support all necessary components. The E VA L -

AD7124-8SDZ board connects to the USB port of the PC by

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

The E VA L -AD7124-8SDZ software fully configures the

AD7124-8 device register functionality and provides dc time

domain analysis in the form of waveform graphs, histograms,

and associated noise analysis for ADC performance evaluation.

The E VA L -AD7124-8SDZ is an evaluation board that is designed

to allow the user to evaluate the features of the ADC. The user

PC software executable controls the AD7124-8 over the USB

through the system demonstration platform board (E VA L-SDP-

CB1Z).

FUNCTIONAL BLOCK DIAGRAM

LABVIEW

BASED

SOFTWARE

VOLTAGE

REFERENCE

VOLTAGE

REGULATOR

EXT

VOLTAGE

REGULATOR

NOISE TEST

CIRCUITRY

7V to 9V VIN

ANALOG

INPUTS SDP-B

REFIN

AD7124-4

SENSOR

CONNECTORS

Figure 1. EVAL-AD7124-8SDZ Block Diagram

AD7124-8

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.Rev. PrA | Page 1 of 36

UG-XXX Evaluation Board User Guide

TABLE OF CONTENTS

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

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

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

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

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

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

E VA L-AD7124-8SDZ Quick Start Guide...................................... 3

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

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

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

Power Supplies .............................................................................. 6

Serial Interface ...............................................................................6

Analog Inputs.................................................................................6

Reference Options.........................................................................7

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

Evaluation Board Software...............................................................8

Software Installation Procedures.................................................8

Setting Up the System for Data Capture ................................. 11

Software Operation .................................................................... 12

Evaluation Board Schematics and Artwork................................ 18

E VA L-AD7124-8SDZ Bill of Materials........................................ 27

REVISION HISTORY

1/15—Revision PrA: Initial Version

Rev. PrA | Page 2 of 36

Evaluation Board User Guide UG-XXX

EVAL-AD7124-8SDZ QUICK START GUIDE

To begin using the evaluation board, do the following:

1. With the E VA L-SDP-CB1Z board disconnected from the

USB port of the PC, install the AD7124-8 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 VA L-SDP-CB1Z board to the E VA L -AD7124-

8SDZ board.

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

washer set included in the evaluation board kit to

ensure that the boards are connected firmly together.

3. Apply an external voltage in the range of 7 V to 9 V to the J3

or J5 connecter of the E VA L -AD7124-8SDZ board. This

provides the power supply for the board.

4. Connect the E VA L -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 EVA L-SDP-

CB1Z board if prompted by the operating system.

5. Launch the E VA L -AD7124-8SDZ software from the Analog

Devices subfolder in the Programs menu.

Rev. PrA | Page 3 of 36

UG-XXX Evaluation Board User Guide

EVALUATION BOARD HARDWARE

DEVICE DESCRIPTION

The AD7124-8 is a low power, low noise, complete analog front

end for high precision measurement applications. It contains a

low noise, 24-bit Σ-Δ ADC. It can be configured to have four

differential inputs or seven single-ended or pseudo-differential

inputs. The on-chip low noise instrumentation amplifier means

that signals of small amplitude can be interfaced directly to the

ADC. Other on-chip features include a low drift 2.5 V

reference, excitation currents, reference buffers, multiple filter

options and many diagnostic features.

Complete specifications for the AD7124-8 are provided in the

product data sheet and should be consulted in conjunction with

this user guide when using the evaluation board. Full details

about the EVAL-SDP-CB1Z are available on the Analog

Devices, Inc., website.

HARDWARE LINK OPTIONS

The default link options are listed in Table 1. By default, the

board is configured to operate from a wall wart (dc plug) power

supply via Connector J5. The supply required for the AD7124-8

comes from the on-board ADP1720 LDOs, which generate their

input voltage from J5.

Table 1. Default Link and Solder Link Options

Link No.

Default

Option

Description

LK1 A Connects the AVDD voltage to the power supply sequencer, ADM1185.

When AVDD equals 3.3 V, LK1 must be in Position A.

When AVDD equals 1.8 V, LK1 must be in Position B.

LK2 B Selects the connector for the external 7 V to 9 V power supply.

In Position A, this link selects the external 7 V to 9 V power supply to come from Connector J3.

In Position B, this link selects the external 7 V to 9 V power supply to come from Connector J5.

LK3 Inserted Inserting this link connects REFIN(-) to AVSS.

LK4 2.5 V Selects the reference source for the ADC.

In position 2.5V, REFIN1(+) is connected to the external 2.5 V reference (ADR4525).

In position INT REF, REFIN1(+) is connected to the REFOUT pin of the AD7124-8. The AD7124-8’s internal

reference can be enabled and applied to the AD7124-8 external to the ADC.

LK5

Inserted

This link shorts AIN0 to AIN1. This is useful to perform noise tests on the AD7124-8. The internal bias can

be enabled on AIN0 or AIN1 so that AIN0 and AIN1 are at an appropriate voltage for the noise test.

LK6

Inserted

Headers J13 and J14 can be used to connect channels AIN4 and AIN5 to external components such as an

external amplifier. Both links at LK6 should be opened to include the external component on the front-

end.

SL2 A Sets the voltage applied to the AVDD pin.

In Position A, this link sets the voltage applied to the AVDD pin to be a 3.3 V supply from the ADP1720-3.3

(U7) regulator or a 2.5 V supply from the ADP1720 (U4) regulator.

In Position B, this link sets the voltage applied to the AVDD pin to be supplied from an external voltage

source via Connector J9.

SL3, SL7 A, A With SL3 and SL7 in Position A, AVDD is supplied with 3.3 V from ADP1720-3.3 (U7) regulator.

With SL3 and SL7 in Position B, AVDD is supplied with 1.8 V from the ADP1720 (U4) regulator.

SL5 B With this link in Position A, the IOVDD supply is provided from an external source via Connector J9.

With this link in Position B, the 3.3 V supply is generated by the ADP1720-3.3 (U10) regulator.

The evaluation system operates with 3.3 V logic.

AVSS to

AGND

R49, R50, R51,

R52

When these links are inserted, AVSS is tied to AGND. When AVSS is set to −1.8 V, these links must be

removed.

Rev. PrA | Page 4 of 36

Evaluation Board User Guide UG-XXX

On-Board Connectors

Table 2 provides information about the external connectors on the E VA L-AD7124-8SDZ.

Table 2. On-Board Connectors

Connector

Function

J1 A 120-pin connector that mates with the EVAL-SDP-CB1Z (black colored controller board).

J2 Straight PCB Mount SMB/SMA Jack for master clock (not inserted). The EVAL-AD7124-8SDZ has the

footprint to include an SMA/SMB connector, if an external clock source is being used to provide the

master clock to the ADC.

J3 Bench top power supply voltage input. Apply 7 V to 9 V and GND (0 V) to this connector to power the

evaluation board.

J5 Wall wart (dc plug) power supply voltage input. Apply 7 V to 9 V and GND (0 V) to this connector to

power the evaluation board.

J6 Analog input connector. Connections to AIN0 to AIN5 are available along with REFIN1(+) connections.

This connector can be used to connect an RTD to the AD7124-8.

J9 Optional external connector, allowing external bench top or alternative supply for AVDD and IOVDD.

When split supplies are used, AVSS is supplied externally via J9.

J11

Analog input connector. Connections to AIN6 to AIN7 are available along with REFIN1(+) and analog

power supply connections. This connector can be used to connect a loadcell to the AD7124-8.

J12

6-pin connector. Provides an I2C interface to allow the SDP to interface to a digital temperature sensor.

This is required if a thermocouple is interfaced to the AD7124-8 using connector A2.

J13 7-pin connector which can be used to connect an external amplifier to channel AIN4/AIN5.

J14 7-pin connector which allows connection to pins AIN4 and AIN5.

A0 Straight PCB Mount SMB/SMA Jack. The footprint for an SMA/SMB connector is included on the

evaluation board to provide the signal to analog input AIN4.

Straight PCB Mount SMB/SMA Jack. The footprint for an SMA/SMB connector is included on the

evaluation board to provide the signal to analog input AIN5.

Thermocouple connector. This connector is required useful if a thermocouple is being interfaced to

the evaluation board.

Straight PCB Mount SMB/SMA Jack. The footprint for an SMA/SMB connector is included on the

evaluation board to provide the signal REFIN1(+).

Straight PCB Mount SMB/SMA Jack. The footprint for an SMA/SMB connector is included on the

evaluation board to provide the signal REFIN1(-).

Rev. PrA | Page 5 of 36

UG-XXX Evaluation Board User Guide

POWER SUPPLIES

The evaluation board requires that an external power supply—

either a bench top supply or a wall wart (dc plug) supply—be

applied to J3 or J5 (see Table 3 for more information). Linear

regulators generate the required power supply levels from the

applied VIN rail. The regulators used are the ADP1720-3.3 (U7)

and the ADP1720 (U4), which supply 3.3 V and 1.8 V,

respectively, to AVDD of the ADC. The 3.3 V ADP1720 (U10)

delivers 3.3 V to the IOVDD pin of the AD7124.4.

When a split power supply is used, the AVSS voltage must be

applied from an external source via Connector J9. AVDD and

IOVDD can also be provided via Connector J9. However, the 7

V to 9 V supply is still required because the on-board reference

(ADR4525) is supplied from this power supply.

Each supply is decoupled at the point where it enters the board

and again at the point where it connects to each device (see

the schematics shown in Error! Reference source not found. to

Error! Reference source not found. to identify decoupling

points).

SERIAL INTERFACE

The AD7124-8 evaluation board connects via the SPI to the

Blackfin® ADSP-BF527 on the E VA L -SDP-CB1Z. There are four

primary signals: CS, SCLK, DIN, and DOUT/RDY (all are

inputs, except for DOUT/RDY, which is an output.)

If you wish to operate the E VA L -AD7124-8SDZ in standalone

mode, the AD7124-8 serial interface lines can be disconnected

from the 120-pin header by removing the 0 Ω links, R9 through

R13. The test points can then be used to fly-wire the signals to

an alternative digital capture setup.

ANALOG INPUTS

The E VA L -AD7124-8SDZ primary analog inputs can be applied

in two ways:

•Using J6 and J11, the green screw in terminal connectors

•Using the A0 and A1 SMB/SMA footprints on the

evaluation board which connect to analog inputs AIN4and

AIN5.

The E VA L -AD7124-8SDZ software is set up to analyze dc

inputs to the ADC.

Table 3. Required External Power Supply1

Power Supply

(VIN) Applied

To Voltage Range Function

7 V to 9 V

Bench top supply to the evaluation board. Supplies LDOs that create 3.3 V and 1.8 V rails. It also

supplies the ADR4525 external reference. Ensure that LK2 is set to Position A when the external

power supply is applied to this connector.

J5 7 V to 9 V Wall wart (dc plug) supply to the evaluation board. Supplies LDOs that create 3.3 V and 1.8 V rails. It

also supplies the ADR4525 external reference. Ensure that LK2 is set to Position B when the

external power supply is applied to this connector.

1Only a single supply is required, either J3 or J5. This can be selected using LK2.

Rev. PrA | Page 6 of 36

Evaluation Board User Guide UG-XXX

REFERENCE OPTIONS

The E VA L -AD7124-8SDZ includes an external 2.5 V reference

(the ADR4525) and an internal 2.5 V reference. The default

operation is to use the external reference input, which is set to

accept the 2.5 V ADR4525 on the evaluation board.

The reference used for a conversion is selected by choosing the

reference in the Configx registers associated with Setup 0 to

Setup 15.

Switch between using the internal reference and external reference

by accessing the AD7124-8 register map via the evaluation soft-

ware. Figure 2 shows how to select the reference source for

Setup 0 to Setup 15. Figure 3 shows the ADC_Control register

setting that enables the internal reference.

Figure 2. Selecting the Reference Source

Figure 3. Turning On the Internal 2.5 V Reference

EVALUATION BOARD SETUP PROCEDURES

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 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.

Configuring the Evaluation and SDP Boards

1. Connect the E VA L -SDP-CB1Z board to Connector A or

Connector B on the E VA L -AD7176-2SDZ board. Screw

the two boards together using the plastic screw-washer set

included in the evaluation board kit to ensure that the

boards are connected firmly together.

2. Connect the power supplies to the E VA L-AD7124-8SDZ

board. The E VA L -AD7124-8SDZ board, by default, uses

the wall wart (dc plug) supply that accompanies the

evaluation kit. Connect this supply to J5 on the E VA L -

AD7124-8SDZ board. (For more information about the

required connections and available options, refer to the

Power Supplies section.)

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

supplied USB cable.

Rev. PrA | Page 7 of 36

UG-XXX Evaluation Board User Guide

EVALUATION BOARD SOFTWARE

SOFTWARE INSTALLATION PROCEDURES

The E VA L -AD7124-8SDZ 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:

•AD7124-8 evaluation board software installation

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

drivers installation

Warning

The evaluation software and drivers must be installed before

connecting the evaluation board and EVA 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 AD7124-8 Evaluation Board Software

To install the AD7124-8 evaluation board software,

1. With the E VA 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\AD7124-8.

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

program to make changes to your computer. Click Yes.

Figure 4. AD7124-8 Evaluation Software Installation:

Granting Permission for the Program to Make Changes to Your Computer

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

(Figure 5 shows the default locations, which are displayed

when the window opens, but you can select another location

by clicking Browse.)

Figure 5. AD7124-8 Evaluation 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 6. AD7124-8 Evaluation Software Installation:

Accepting the License Agreement

Rev. PrA | Page 8 of 36

Evaluation Board User Guide UG-XXX

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

continue.

Figure 7. AD7124-8 Evaluation Software Installation:

Reviewing a Summary of the Installation

7. A dialog box informs you when the installation is

complete. Click Next.

Figure 8. AD7124-8 Evaluation Software Installation:

Indicating When the Installation Is Complete

Rev. PrA | Page 9 of 36

UG-XXX Evaluation Board User Guide

Installing the EVAL-SDP-CB1Z System Demonstration

Platform Board Drivers

After the installation of the evaluation software is complete, a

welcome window is displayed for the installation of the E VA L-

SDP-CB1Z system demonstration platform board drivers.

1. With the E VA 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 9. EVAL-SDP-CB1Z Drivers Setup:

Beginning the Drivers Installation

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

Figure 10. EVAL-SDP-CB1Z Drivers Setup:

Selecting the Location for Drivers Installation

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

drivers.

Figure 11. EVAL-SDP-CB1Z Drivers Setup:

Granting Permission to Install Drivers

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

closes the installation wizard.

Figure 12. EVAL-SDP-CB1Z Drivers Setup:

Completing the Drivers Setup Wizard

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

computer.

Figure 13. EVAL-SDP-CB1Z Drivers Setup:

Restarting the Computer

Rev. PrA | Page 10 of 36

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