ANALOG DEVICES UG-215 Service Manual

Evaluation Board User Guide

UG-215

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

Evaluating the AD5543 Current Output/Serial Input DAC

FEATURES

Full-featured evaluation board for the AD5543

Graphic user interface software for board control and data analysis

Connector to EVAL-SDP-CB1Z system development platform board

Various power supply options

APPLICATIONS

Automatic test equipment

Instrumentation

Digitally controlled calibration

Industrial control PLCs

GENERAL DESCRIPTION

The AD5543 is a precision, 16-bit, low power, current output, small form factor, digital-to-analog converter (DAC). It is designed to operate from a single 5 V supply with a ±10 V multiplying reference.

The applied external reference, VREF, determines the full-scale output current. An internal feedback resistor (RFB) facilitates the R-2R and temperature tracking for voltage conversion when combined with an external op amp.

A serial data interface offers high speed, 3-wire, microcontrollercompatible inputs using serial data input (SDI), clock (CLK), and chip select (CS).

The AD5543 is packaged in ultracompact (3 mm × 4.7 mm) 8-lead MSOP and 8-lead SOIC packages.

The EVAL-AD5543/53SDZ board is used in conjunction with the EVAL-SDP-CB1Z system development platform (SDP) board available from Analog Devices, Inc., which is purchased separately from the evaluation board. The USB-to-SPI communication to the AD5543 is completed using this Blackfin®-based development board. The software offers a waveform generator.

The EVAL-AD5543/53SDZ can also be used for the AD5553 by changing the number of bits written (14 bits) in the input.

FUNCTIONAL BLOCK DIAGRAM

EVAL-SDPCB1Z-			DVDD	DGND	VSS	AGND		VDD
			AD5543/AD5553					AD8065
TO				16-/14-BIT DAC				I-TO-V
								VOUT
CONNECTOR
							ADR435
							REFERENCE
CS	SDIN	SCLK		VREF				-001
								09485

Figure 1.

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT	Rev. A | Page 1 of 12
WARNING AND LEGAL TERMS AND CONDITIONS.

UG-215		Evaluation Board User Guide
TABLE OF CONTENTS
Features ..............................................................................................	1	Evaluation Board Software...............................................................	3
Applications.......................................................................................	1	Quick Start Procedure ..................................................................	3
General Description .........................................................................	1	AD5543 Evaluation Software Window ......................................	4
Functional Block Diagram ..............................................................	1	Evaluation Board Schematics and Artwork...................................	7
Revision History ...............................................................................	2	Evaluation Board Layout..............................................................	9
REVISION HISTORY
2/12—Rev. 0 to Rev. A
Changes to Level Set Section...........................................................	4
Replaced Evaluation Board Schematics and Artwork Section ...	7

11/10—Revision 0: Initial Version

Rev. A | Page 2 of 12

Evaluation Board User Guide

UG-215

EVALUATION BOARD SOFTWARE

QUICK START PROCEDURE

To get started, do the following:

1.Load and install the software CD.

2.Plug in the SDP board. The Found New Hardware Wizard dialog box opens, which allows you to install the software automatically.

3.Load the software for the SDP board. Click the Start button on the bottom left corner of your screen, then All Programs, then AD5543, and finally select the SDP32NET executable for the SDP board.

4.Connect the SDP board to the AD5543 evaluation board, and plug in the external power supply.

5.Load the AD5543 software. Click Start, then All Programs, then Analog Devices, and finally AD5543.

09485-002

Figure 2. AD5543 Evaluation Software

Rev. A | Page 3 of 12

UG-215	Evaluation Board User Guide

AD5543 EVALUATION SOFTWARE WINDOW

LEVEL SET

The LEVEL SET section in the AD5543 evaluation software allows you to choose the amplitude for the waveform depending on the code entered in the Input Data box. Click the Write To DAC button to load the code. Being a 16-Bit DAC, the relationship between the code entered and the voltage in the output is as follows:

VOUT =(2DN −1)×VREF

where:

N = 16 bits.

VREF = 5 V.

D is the code introduced in decimal (0 to 32,767).

Waveform Generation

The WAVEFORM GENERATION section allows you to control the different frequencies and features in the waveform generation, including

•SCLK: clock input frequency (30 MHz default value).

•Waveform Frequency (Fo).

•Signal Type: dc signal (default), sawtooth, sine, triangle, and square wave options.

•Sampling Information includes the two following features:

•Sampling Frequency (Fs): to avoid the aliasing effect, it is necessary to choose a frequency that is at least twice the value of the waveform frequency. The number of points sampled is calculated as follows:

Sampling Frequency

Number of Points Sampled = Waveform Frequency

•Number of Samples (s): this constant allows you to show in a graph a determined number of periods depending on its value. The maximum number of samples is 32,768.

Number of samples Number of Periods = Number of Points Sampled

•Data Loaded to DAC: the array contains the value of every code where the waveform has been sampled.

•The graph shows each of the points contained in the array.

Example 1

1.Power on the board.

2.Start up the software.

3.Select the default 30 MHz clock frequency.

4.Select a waveform frequency of 500 Hz and Sine Wave as the signal type to show (dc signal is the default).

5.Select a sampling frequency of 20 kHz and 80 for the number of samples.

Number of Points Sampled = 20,000500 HzHz = 40

Number of Periods = 8040 =2

6.Write the Code FFFF to show full scale.

7.Click Write To DAC.

The waveform obtained from the values entered shows two periods and the 40 samples per period (see Figure 3). The code of each sample is loaded in the array on the right side.

Click the STOP button to end the execution of the software.

Example 2

For a sharper waveform, the sampling frequency and the number of samples must be raised according to the frequency. The next example (see Figure 4) shows this relationship, where the sampling frequency value is changed to 1 MHz and the number of samples is 2000.

	Number of Points Sampled =	1,000,000 Hz	=2000
		500 Hz

Number of Periods = 20002000 =1

Rev. A | Page 4 of 12