ANALOG DEVICES UG-297 Service Manual

Evaluation Board User Guide

UG-297

SYNC SDIN SCLK

SDO LDAC CLR

VDD1 VSSVDD AGND

DAC A

CONNECTOR TO SDP-1Z

V

REF

A V

REF

B

ADR01

REFERENCE

DAC B

AD5449

12-BIT DAC

DAC A

DAC B

AD5415

12-BIT DAC

EVAL-AD5415/AD5449SDZ

AD8065

I TO V

AD8065

I TO V

AD8065

I TO V

AD8065

I TO V

V

OUT

A

V

OUT

B

V

OUT

A

V

OUT

B

09974-001

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

Evaluating the AD5449 Serial Input, Dual-Channel Current Output DAC

FEATURES

Full-featured evaluation board for the AD5449
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

Portable battery-powered applications
Waveform generators
Analog processing
Instrumentation applications
Programmable amplifiers and attenuators
Digitally controlled calibration
Programmable filters and oscillators
Composite video
Ultrasound
Gain, offset, and voltage trimming

GENERAL DESCRIPTION

The AD5449 is a CMOS, 12-bit, dual-channel, current output
digital-to-analog converter. This device operates from a 2.5 V to

EVALUATION BOARD FUNCTIONAL BLOCK DIAGRAM

5.5 V power supply, making it suited to battery-powered and
other applications.

As a result of being manufactured on a CMOS submicron process,
this part offers excellent four-quadrant multiplication character­istics, with large signal multiplying bandwidths of 10 MHz.

The applied external reference input voltage (V

x) determines

REF

the full-scale output current. An integrated feedback resistor
(R

x) provides temperature tracking and full-scale voltage

FB

output when combined with an external current-to-voltage
precision amplifier.

This DAC uses a double-buffered, 3-wire serial interface that is
compatible with SPI, QSPI™, MICROWIRE®, and most DSP
interface standards. In addition, a serial data out pin (SDO)
allows daisy-chaining when multiple packages are used. Data
readback allows the user to read the contents of the DAC register
via the SDO pin. On power-up, the internal shift register and
latches are filled with 0s, and the DAC outputs are at zero scale.
The AD5449 DAC is available in 16-lead TSSOP packages.

The evaluation board, EVAL-AD5415/AD5449SDZ, is available
for evaluating the performance of the AD5449 DAC.

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

Rev. A | Page 1 of 12

Figure 1.

UG-297 Evaluation Board User Guide

TABLE OF CONTENTS

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

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

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

Evaluation Board Functional Block Diagram ............................... 1

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

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

System Demonstration Platform ................................................ 3

EVAL-AD5415/AD5449SDZ to SPORT Interface ................... 3

Operating the Evaluation Board ................................................. 3

Serial Interface .............................................................................. 3

Microprocessor Interfacing ......................................................... 3

REVISION HISTORY

3/12—Rev. 0 to Rev. A

Changes to General Description Section ...................................... 1

Replaced Evaluation Board Schematics and Artwork Section ... 8

6/11—Revision 0: Initial Version

Evaluation Board Software ...............................................................4

Installing the Software ..................................................................4

Running the Software ...................................................................4

Using the Evaluation Board Software .............................................5

Evaluation Board Functions and Registers ................................5

Evaluation Board Schematics and Artwork ...................................8

Schematics ......................................................................................8

Evaluation Board Layout ........................................................... 11

Related Links ............................................................................... 12

Rev. A | Page 2 of 12

Evaluation Board User Guide UG-297

ADSP-BF5xx

AD5449

SYNC

SPORT_TFS

SPORT_RFS

SCLK

SPORT_TSCLK
SPORT_RSCLK

SDIN

SPORT_DTO

SDO

SPORT_DRO

LDAC

GPIO1

CLR

GPIO2

09974-002

EVALUATION BOARD

The E VA L -AD5415/AD5449SDZ evaluation board consists of
an AD5449 DAC, an AD5415 DAC, and current-to-voltage
amplifiers, the AD8065. Included on the evaluation board is a
10 V reference, the ADR01. An external reference can also be
applied via an SMB input. The evaluation kit consists of a CD­ROM with self-installing PC software to control the DAC. The
software allows the user to write a code to the device.

The E VA L -AD5415/AD5449SDZ evaluation board is used in
conjunction with the EVAL-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 AD5449 is completed using
this Blackfin®-based demonstration board. The software offers a
waveform generator.

SYSTEM DEMONSTRATION PLATFORM

The system demonstration platform (SDP) is a hardware and
software evaluation tool for use in conjunction with product
evaluation boards. The SDP board is based on the Blackfin
BF527 processor with USB connectivity to the PC through a
USB 2.0 high speed port. For more information about this
device, see the system demonstration platform web page.

EVAL-AD5415/AD5449SDZ TO SPORT INTERFACE

The Analog Devices SDP has one SPORT serial port. The
SPORT interface is used to control the AD5449, allowing clock
frequencies of up to 30 MHz.

SERIAL INTERFACE

The AD5449 has an interface that is compatible with SPI, QSPI,
MICROWIRE, and most DSP interface standards. Data is
written to the device in 16-bit words. Each 16-bit word consists
of four control bits and 12 data bits for the AD5449. Control
bits allow control of various functions on the DAC.

MICROPROCESSOR INTERFACING

Microprocessor interfacing to the AD5449 DAC is through a
serial bus that uses a standard protocol compatible with micro­controllers and DSP processors.

The system demonstration platform (SDP) is a hardware and
software platform that provides a means to communicate from
the PC to Analog Devices products and systems that require
digital control and/or readback. The SDP has a Blackfin
processor (BF5xx) at its core.

The ADSP-BF5xx processor incorporates channel synchronous
serial ports (SPORT) and general purpose input/output pins
(GPIO). A serial interface between the BlackFin processor and
the AD5449

For more details about the system demonstration platform, see

EVAL-SDP-CB1Z.

DAC is shown in Figure 2.

OPERATING THE EVALUATION BOARD

The board requires ±12 V and +5 V supplies. The +12 V VDD
and −12 V V
supply is used to power the DAC (V

Both supplies are decoupled to their respective ground plane
with 10 µF tantalum and 0.1 µF ceramic capacitors.

are used to power the output amplifier; the +5 V

SS

) and transceivers (VCC).

DD

Figure 2. ADSP-BF5xx-to-AD5449 Interface

Rev. A | Page 3 of 12

UG-297 Evaluation Board User Guide

09974-003

09974-004

EVALUATION BOARD SOFTWARE

Figure 3. Device Manager Showing the SDP Board Connected

INSTALLING THE SOFTWARE

The EVAL-AD5415/49SDZ 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-AD5415/49SDZ evaluation kit CD.

3. Download the E VA L -AD5415/49SDZ LabVIEW™ software.

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

plug the EVAL-AD5415/49SDZ 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).

RUNNING THE SOFTWARE

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

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

AD5415/49SDZ.

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

the software is launched, a connectivity error displays (see
Figure 4.). Simply connect the evaluation board to the USB
port of the PC, wait a few seconds, click Rescan, and follow
the instructions.

Figure 4. Connectivity Error

Rev. A | Page 4 of 12