ANALOG DEVICES UG-286 Service Manual

Evaluation Board User Guide

UG-286

AD5545

AD8065

I-TO-V

V

OUT

A1

V

REF

ADR01

REFERENCE

SDICLKCS

AD8065

I-TO-V

V

OUT

B1

LDAC
RS
MSB

I

OUT

A

I

OUT

B

EVAL-SDP-CB1Z

USB

SPORT

GPIO

09901-001

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

Evaluating the AD5545 Current Output/Serial Input DAC

FEATURES

Full-featured evaluation board for the AD5545
Graphic user interface software for board control and

data analysis

Connector to E VAL-SDP-CB1Z system demonstration

platform board

Various power supply options

APPLICATIONS

Automatic test equipment
Instrumentation
Digitally controlled calibration

GENERAL DESCRIPTION

The AD5545 dual, 16-bit, current output, digital-to-analog
converter (DAC) is designed to operate from a single 5 V
supply with bipolar output up to ±15 V capability.

The applied external reference input voltage (V
the full-scale output current. Integrated feedback resistors (R
provide temperature-tracking, full-scale voltage outputs when
combined with an external I-to-V precision amplifier.

) determines

REF

A double-buffered serial data interface offers high speed,
3-wire, SPI-compatible, and microcontroller-compatible inputs
using serial data in (SDI), chip select (
signals. A common, level-sensitive, load DAC strobe (
input allows the simultaneous update of all DAC outputs from
previously loaded input registers. Additionally, an internal
power-on reset forces the output voltage to 0 at system turn-on.
An MSB pin allows system reset assertion (
registers to zero code when MSB = 0, or to half-scale code
when MSB = 1.

The AD5545 is packaged in the compact 16-lead TSS O P.

The E VA L -AD5544/45SDZ board is used in conjunction with
the EVA L -SDP-CB1Z system demonstration platform (SDP)
board available from Analog Devices, Inc., which is purchased
separately from the evaluation board. The USB-to-SPI
communication to the AD5545 is completed using the EVAL-

SDP-CB1Z Blackfin®-based demonstration board.

)

FB

CS

), and clock (CLK)

RS

) to force all

LDAC

)

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

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UG-286 Evaluation Board User Guide

TABLE OF CONTENTS

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

Applications ....................................................................................... 1

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

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

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

Evaluation Board Software .............................................................. 3

Installing the Software ................................................................. 3

REVISION HISTORY

2/12—Rev. 0 to Rev. A

Replaced Evaluation Board Schematics and Artwork Section ... 5

8/11—Revision 0: Initial Version

Running the Software ...................................................................3

Using the Evaluation Board Software .............................................4

Example ..........................................................................................4

Evaluation Board Schematics and Artwork ...................................5

Evaluation Board Layout ..............................................................8

Related Links ......................................................................................9

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Evaluation Board User Guide UG-286

09901-002

09901-003

EVALUATION BOARD SOFTWARE

Figure 2. Device Manager Showing the SDP Board Connected

INSTALLING THE SOFTWARE

The EVAL-AD5544/45SDZ evaluation kit includes the software
and drivers on CD. To install the software, follow these steps:

1. Install the software before connecting the SDP board to the

USB port of the PC.

2. Start the Windows operating system and insert the

EVAL-AD5544/45SDZ evaluation kit CD.

3. Download the E VA L -AD5544/45SDZ LabVIEW™ software.

The correct driver, SDPDriversNET, for the SDP board
should download automatically after LabVIEW is
downloaded, supporting both 32- and 64-bit systems.

RUNNING THE SOFTWARE

To run t h e evaluation board program, do the following:

1. Click Start/All Programs/Analog Devices/EVAL-

AD5544_45SDZ.

2. If the SDP board is not connected to the USB port when

the software is launched, a connectivity error displays (see
Figure 3). Simply connect the evaluation board to the USB
port of the PC, wait a few seconds, click Rescan, and follow
the instructions.

However, if the drivers do not download automatically,
the driver executable file can also be found in the Program
Files/Analog Devices folder. Follow the on-screen prompts
to install it.

4. After the installation of the software and drivers is complete,

plug the E VAL -AD5544/45SDZ into the SDP board and
the SDP board into the PC using the USB cable included
in the box.

5. When the software detects the evaluation board, proceed

through any dialog boxes that appear to finalize the
installation (Found New Hardware Wizard/Install the
Software Automatically and so on).

Figure 3.

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UG-286 Evaluation Board User Guide

09901-004

09901-005

V5.2

536,65

384,16

10

536,65

−=×−=×−=

D

VV

REFOUT

V5.7

536,65

152,49

10

536,65

−=×−=×−=

D

VV

REFOUT

USING THE EVALUATION BOARD SOFTWARE

Once the software is launched, the main window pops up (see
Figure 4).

The desired 16-bit data loads and updates one of the four DACs
selected by the user within the AD5545 part.

There are two modes for loading the data. The first one is
synchronous mode where you can program each channel
separately but update them simultaneously. Program
high, load the channels and finally pull

LDAC

LDAC

low. The asyn­chronous mode enables you to load and update each channel
separately (the

The reset button,

LDAC

button is ignored in this case).

RS

, updates all channel outputs to zero scale

or midscale when MSB is pulled low or high.

EXAMPLE

LDAC

With
specify quarter scale (0x4000, 16384d) in the Input Data box
and click Load and Update DAC A. The expected output
obtained is

and RS tied high for asynchronous loading mode,

Figure 4. Main Window

The first step is to select the device to use which is connected
to the SDP board, in this case the AD5545, and click the OK
button.

After selecting the device, the AD5545 evaluation software
window appears (see Figure 5) to allow writing on the device.

When you change the loading synchronism mode to synch­ronous and write the value 0xC000 (49152d), you see no change
in the output until

LDAC

is tied low. The expected output for

this case is

Figure 5. AD5545 Evaluation Software Window

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