Analog Devices EVAL-CN-304-SDZ Manual de usuario

EVAL-CN-304-SDZ Evaluation Board User Guide

UG-266

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 AD9834 20 mW Power, 2.3 V to 5.5 V, 75 MHz Complete DDS by Using

the EVAL-CN-304-SDZ

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.Rev. B | Page 1 of 12

FEATURES

Full featured evaluation board (EVAL-CN-304-SDZ) for the

AD9834

Graphic user interface software for board control and data

analysis

Connector to the EVAL-SDP-CB1Z System Demonstration

Platform (SDP) board

Various power supply and reference link options

APPLICATIONS

Biomedical sensors

Bioelectrical impedance analysis

Electrochemical analysis

Impedance spectroscopy

Complex impedance measurement

Nondestructive testing

GENERAL DESCRIPTION

The AD9834 is a 75 MHz, low power DDS device capable of

producing high performance sine and triangular outputs. It

also has an on-board comparator that allows a square wave to

be produced for clock generation. Consuming only 20 mW of

power at 3 V makes the AD9834 an ideal candidate for power-

sensitive applications.

The E VA L -CN-304-SDZ board is used in conjunction with a

E VA L-SDP-CB1Z board available from Analog Devices, Inc. The

USB to SPI communication to the AD9834 is completed using

this Blackfin®-based development board.

A high performance, on-board 75 MHz trimmed general oscillator

is available to use as the master clock for the AD9834 system.

Various links and SMB connectors are also available on the

E VA L-CN-304-SDZ board to maximize the usability.

Complete specifications for the AD9834 are provided in the

AD9834 data sheet, available from Analog Devices. Consult the

AD9834 data sheet in conjunction with this user guide when

using the evaluation board.

FUNCTIONAL BLOCK DIAGRAM

SCLK SDATAFSYNC

IOUTB

MCLK

AD9834

FSELECT

PSELECT

RESET

EVAL-SDP-CB1Z

ADP3301

USB

SPORT

GPIO IOUT

MCLK XO

09791-001

Figure 1.

UG-266 EVAL-CN-304-SDZ Evaluation Board User Guide

Rev. B | Page 2 of 12

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

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

Operating the Software.................................................................5

Evaluation Board Schematics and Layout......................................8

Ordering Information.................................................................... 11

Bill of Materials........................................................................... 11

REVISION HISTORY

8/15—Rev. A to Rev. B

Changes to Title ............................................................................................ 1

Changed EVAL-AD9834SDZ to EVAL-CN-304-SDZ ...Throughout

Changes to Installing the Software Section................................... 3

Changes to Table 1 and Figure 4..................................................... 4

Deleted Setting up the Digital Interface Section and Figure 5;

Renumbered Sequentially................................................................ 5

Added Operating the Software Section ......................................... 5

Changes to Figure 5 to Figure 8 and Programming Method:

Hardware or Software Section ........................................................ 5

Changes to Waveform Options Section, Power-Down Options

Section, and Figure 9 to Figure 14.................................................. 6

Changes to Example of Operation Section ....................................7

Changes to Figure 16.........................................................................8

Changes to Figure 17 and Figure 18 ...............................................9

Change to Figure 19 and Figure 20 .............................................. 10

Changes to Table 2.......................................................................... 11

8/12—Rev. 0 to Rev. A

Change LK3 Position from In to Out, Table 1...............................4

4/11—Revision 0: Initial Version

EVAL-CN-304-SDZ Evaluation Board User Guide UG-266

Rev. B | Page 3 of 12

EVALUATION BOARD SOFTWARE

INSTALLING THE SOFTWARE

The E VA L-CN-304-SDZ evaluation kit includes the software and

drivers on a CD. The software is compatible with Windows® XP,

Windows Vista, and Windows 7.

To install the software, follow these steps:

1. Install the software before connecting the E VA L-SDP-CB1Z

board to the USB port of the PC.

2. Start the Windows operating system and install the

software from the E VA L -CN-0304-SDZ evaluation kit CD.

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

plug the E VA L -CN-304-SDZ into the E VA L-SDP-CB1Z

board, and then plug the E VA L -SDP-CB1Z board into the

PC using the USB cable included in the box.

4. 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).

09791-003

Figure 2. Hardware Device Manager Window with the EVAL-SDP-CB1Z Board Plugged In

UG-266 EVAL-CN-304-SDZ Evaluation Board User Guide

Rev. B | Page 4 of 12

RUNNING THE SOFTWARE

To run the evaluation board program, do the following:

1. Click Start/All Programs/Analog Devices/AD9834/

AD9834 Eval Board.

2. If the E VA L -SDP-CB1Z board is not connected to the USB

port when the software is launched, a connectivity error

displays (see Figure 3). Simply connect the E VA L -CN-304-

SDZ evaluation board to the USB port of the PC, wait a few

seconds, click Rescan, and follow the instructions.

3. Ensure that all links are in their correct locations (see Table 1).

The main window of the E VA L -CN-304-SDZ evaluation

software then opens, as shown in Figure 4.

09791-002

Figure 3. Pop-Up Window Error

Table 1. Default Setup for Link Positions

Link No. Position Function

LK1 A External DVDD supply powers the

on-board oscillator

B (default) On-board linear regulator selected

to supply power to the general

oscillator

LK2 A Digital block powered through the

DVDD external connector

B (default) 3.3 V digital supply for the AD9834

supplied by the EVAL-SDP-CB1Z

board

LK3 Out (default) Decouple the CAP/2.5V pin to ground

because V

is >2.7 V

In Connect the jumper when the external

DVDD supply < 2.7 V

LK4 A Analog supply provided by the

external AVDD connector

B (default) 3.3 V analog supply for the AD9834

supplied by the EVAL-SDP-CB1Z

board

09791-004

Figure 4. EVAL-CN-304-SDZ Evaluation Board Software

EVAL-CN-304-SDZ Evaluation Board User Guide UG-266

Rev. B | Page 5 of 12

OPERATING THE SOFTWARE

Select External MCLK Frequency

Having selected the digital interface specifics, next use the

MCLK box to choose which frequency to use. The boards are

supplied with a 75 MHz general oscillator. If a different clock

source is required, the CLK1 SMB connector can be used to

supply a different MCLK value.

Two options for the general oscillator include the AEL3013

oscillators from AEL Crystals and the SG-310SCN oscillators

from Epson Electronics.

09791-005

Figure 5. MCLK Input

Programming Method: Hardware or Software

Functions that select frequency and phase registers, reset internal

registers, and power down the DAC can be implemented by

using either software or hardware. Click Software or Hardware

to select the programming method (see Figure 6). By choosing

hardware, the appropriate hardware control pins are used to

control these functions. By choosing software, the appropriate

software control bits are used to control these functions.

09791-006

Figure 6. Programming Method

Loading Frequency and Phase Registers

The desired output frequency and output phase can be loaded

using the inputs shown in Figure 7. Either the FREQ 0 register or

the FREQ 1 register can be loaded with frequency data. The

frequency data is loaded in megahertz, and the equivalent

hexadecimal code is shown to the right once data is entered; press

Enter to load the data. When data is loaded, the output appears on

the IOUT and IOUTB pins. Similarly, select either the PHASE 0

degrees.

The analog output frequency from the AD9834 is defined by

fMCLK/228 × FREQREG

where FREQREG is the value loaded into the selected frequency

2π/4096 × PHASEREG

where PHASEREG is the value contained in the selected phase

09791-007

Figure 7. Frequency and Phase Load

FSK and PSK Functionality

In software mode, the AD9834 can be set up for FSK or PSK

functionality by entering the bit rate in milliseconds and by

clicking the PSK or FSK button (see Figure 8).

09791-008

Figure 8. FSK and PSK Functionality

UG-266 EVAL-CN-304-SDZ Evaluation Board User Guide

Rev. B | Page 6 of 12

Waveform Options

The output waveform options that can be selected are sinusoidal

waveform or ramp waveform. The SIGN BIT OUT pin output

can be selected using three options: selecting MSB or MSB/2 of

the phase accumulator or selecting the internal comparator. If

this pin is not used, click DISABLE (see Figure 9).

09791-009

Figure 9. Waveform Profile and SIGN BIT OUT

Power-Down Options

The AD9834 has various power-down options selected through

the control register. The master clock (MCLK) or the DAC can

be disabled, or both sections can be powered down for a lower

power sleep mode (see Figure 10).

09791-010

Figure 10. Power-Down Options

Hardware Options

If the hardware programming method is selected (see Figure 6),

the FSELECT (FSEL0), PSELECT (PSEL0), RESET, and SLEEP

pin functions can be toggled. The GPIO outputs on the EVAL-

SDP-CB1Z board control these pin functions. For example,

frequency data can be loaded to the FREQ 0 register and the

FREQ 1 register and the output can be toggled by the FSELECT

pin, that is, 2FSK functionality.

09791-011

Figure 11. GPIO Hardware Pin Control

09791-012

Figure 12. FSEL0 Hardware Pin Control

Reset and Sweep

Use the Reset Bit button shown in Figure 13 to set the reset

software command. To set up a DDS sweep, click FREQUENCY

SWEEP.

09791-013

Figure 13. Software Reset and Sweep Select

The sweep function allows users to load a Start Frequency,

Stop Frequency, increment size (Step Frequency), number of

loops (N. of Loops), and Delay between each frequency

increment. These commands then load to the device

automatically from the E VA L -SDP-CB1Z board.

09791-014

Figure 14. Sweep Functionality

EVAL-CN-304-SDZ Evaluation Board User Guide UG-266

Rev. B | Page 7 of 12

Example of Operation

An example of configuring the AD9834 to output 1 MHz follows:

1. Plug the EVAL-SDP-CB1Z board into the EVAL-CN-304-SDZ

board and connect to the USB port.

2. Start up the software located at Start/All Programs/

Analog Devices/AD9834/AD9834 Eval Board. The

EVAL-SDP-CB1Z board begins to communicate with the PC.

3. Define MCLK; the default is an on-board 75 MHz

oscillator.

4. Ensure that all links are in the correct locations (see Table 1).

5. Select the FREQ 1 register.

6. Load a 1 MHz excitation frequency and press Enter.

The output should appear on the IOUT and IOUTB outputs on

the evaluation board.

For the FREQ 0 register, do the following:

1. Select the FREQ 0 register.

2. Load the FREQ 0 register with 2 MHz.

3. Press Enter.

For the FREQ 1 register, select the FREQ 1 register to load the

1 MHz associated with this register.

09791-015

CH2 100mV100mV M 200ns

0.00000s A CH1 216mVCH1

CH1 FREQUENCY: 1.000MHz

CH1 PEAK TO PEAK: 572mV

Figure 15. 1 MHz Output Signals on the IOUT and IOUTB Test Points

UG-266 EVAL-CN-304-SDZ Evaluation Board User Guide

Rev. B | Page 8 of 12

EVALUATION BOARD SCHEMATICS AND LAYOUT

09791-016

Figure 16. EVAL-CN-304-SDZ Schematic Part A

EVAL-CN-304-SDZ Evaluation Board User Guide UG-266

Rev. B | Page 9 of 12

09791-017

Figure 17. EVAL-CN-304-SDZ Schematic Part B

09791-018

Figure 18. EVAL-CN-304-SDZ Component Side View Layer 1

UG-266 EVAL-CN-304-SDZ Evaluation Board User Guide

Rev. B | Page 10 of 12

09791-020

Figure 19. EVAL-CN-304-SDZ Component Side View Silkscreen

09791-019

Figure 20. EVAL-CN-304-SDZ Component Side View Layer 2, Solder Side

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