Analog Devices EVAL-AD5676SDZ Manual de usuario

EVAL-AD5676SDZ/

EVAL-AD5676RSDZ User Guide

UG-814

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 AD5676/AD5676R Octal, 16-Bit nanoDAC+

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

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

FEATURES

Full featured evaluation board for the AD5676/AD5676R

Various link options

PC control in conjunction with the Analog Devices, Inc.,

EVAL-SDP-CB1Z system demonstration platform (SDP)

EVALUATION KIT CONTENTS

EVAL-AD5676SDZ/EVAL-AD5676RSDZ evaluation board

ADDITIONAL EQUIPMENT AND SOFTWARE NEEDED

EVAL-SDP-CB1Z SDP board, includes a USB cable

Bench power supply (6 V dc)

PC running Windows 7 or later with USB 2.0 port

ONLINE RESOURCES

Documents Needed

AD5676/AD5676R data sheet

EVAL-AD5676SDZ/EVAL-AD5676RSDZ user guide

Required Software

ACE software

GENERAL DESCRIPTION

This user guide details the operation of the evaluation boards

for the AD5676/AD5676R octal channel, voltage output digital-

to-analog converter (DAC).

The E VA L -AD5676SDZ/E VA L-AD5676RSDZ evaluation

boards help users to quickly prototype new AD5676/AD5676R

circuits and reduce design time. The AD5676/AD5676R operate

from a single 2.7 V to 5.5 V supply. The AD5676R has an internal

2.5 V reference giving a maximum output voltage of 2.5 V or 5 V.

The AD5676 does not have an internal reference; therefore, an

ADR431 is provided on-board as a 2.5 V reference source. A

different reference voltage can be applied via the EXT_REF SMB

connector, if required.

Full data on the AD5676/AD5676R are available in the respective

product data sheets, available from Analog Devices, which should

be consulted in conjunction with this user guide when using the

evaluation boards.

The evaluation boards interface to the USB port of a PC via the

SDP board. The Analysis Control Evaluation (ACE) software is

available for use with the evaluation board to allow the user to

program the AD5676/AD5676R.

The evaluation boards are compatible with the E VA L -SDP-CB1Z

Blackfin® SDP controller board (SDP-B), which is available for

order on the Analog Devices website at www.analog.com.

UG-814 EVAL-AD5676SDZ/EVAL-AD5676RSDZ User Guide

Rev. A | Page 2 of 12

TABLE OF CONTENTS

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

Evaluation Kit Contents................................................................... 1

Additional Equipment and Software Needed................................... 1

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

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

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

Typical Evaluation Setup ................................................................. 3

Getting Started .................................................................................. 4

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

Initial Setup ................................................................................... 4

Block Diagram And Description.................................................... 5

Memory Map .................................................................................6

Evaluation Board Hardware.............................................................7

Power Supplies ...............................................................................7

Input Signals...................................................................................7

Output Signals ...............................................................................7

Link Configuration Options ............................................................8

Setup Conditions ...........................................................................8

Evaluation Board Circuitry ..............................................................9

Evaluation Board Schematics........................................................ 10

Bill of Materials............................................................................... 12

REVISION HISTORY

5/2017—Rev. 0 to Rev. A

Changes to Features Section, Additional Equipment and

Software Needed Section, Online Resources Section, and

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

Changes to Installing the Software Section, Changed Evaluation

Board Setup Procedures Section to Initial Set-Up Section ......... 4

Added Figure 3 and Figure 4; Renumbered Sequentially ........... 4

Added Block Diagram and Description Section and Figure 4 ........ 5

Added Table 1; Renumbered Sequentially .................................... 5

Added Memory Map Section, Figure 5, and Figure 6 ................. 6

Deleted How to Use the Software Section..................................... 8

Changes to Table 4.......................................................................... 12

3/2015—Revision 0: Initial Version

EVAL-AD5676SDZ/EVAL-AD5676RSDZ User Guide UG-814

Rev. A | Page 3 of 12

TYPICAL EVALUATION SETUP

12993-001

SDP BOARD AD5676R EVALUATION BOARD

COM

±25V6V

6.000V 0.250A

POWER SUPPLY CONNECTORS

Figure 1.

UG-814 EVAL-AD5676SDZ/EVAL-AD5676RSDZ User Guide

Rev. A | Page 4 of 12

GETTING STARTED

INSTALLING THE SOFTWARE

The E VA L -AD5676SDZ and E VA L -AD5676RSDZ evaluation

boards use the Analog Devices ACE software. ACE is a desktop

software application that allows the evaluation and control of

multiple evaluation systems.

The ACE installer installs necessary SDP drivers and .NET

Framework 4 by default. Install ACE before connecting the SDP

board to the USB port of the PC to ensure that the SDP board is

recognized when it connects to the PC. Use the following link

to download the software, and access full instructions on how

to install and use this software: http://www.analog.com/ace.

After the installation is finished, the E VA L -AD5676SDZ and

E VA L-AD5676RSDZ evaluation board plug-ins appear when

you open ACE.

INITIAL SETUP

To set up the evaluation board, take the following steps:

1. Connect the evaluation board to the SDP-B board and

connect the USB cable between the SDP-B board and the PC.

2. Power the SDP-B and evaluation board by connecting

6 V dc to the J3 connector.

3. Run the ACE application. The E VA L-AD5676SDZ/

E VA L-AD5676RSDZ board plug-ins appear in the

attached hardware section of the Start tab.

4. Double-click on the board plug-in to open the board view

seen in Figure 2.

5. The chip block diagram can be accessed by double-clicking

on the AD5676 or AD5676R chip. This view provides a

basic representation of functionality of the board. The

main functions are labeled in Figure 3.

Figure 2. Board View of the EVAL-AD5676RSDZ

12993-003

Figure 3. Chip Block Diagram View for the AD5676R

EVAL-AD5676SDZ/EVAL-AD5676RSDZ User Guide UG-814

Rev. A | Page 5 of 12

BLOCK DIAGRAM AND DESCRIPTION

The E VA L -AD5676SDZ/E VA L-AD5676RSDZ software is

organized so that it appears similar to the functional block

diagram shown in the data sheets. In this way, it is easy to

correlate the functions on the board with the description in the

data sheets. A full description of each block, register, and its

settings is given in the AD5676/AD5676R data sheets.

Some of the blocks and their functions are described here as

they pertain to the evaluation board. The full screen block

diagram is shown in Figure 4 and Table 1 describe the

functionality of each block.

12993-004

Figure 4. Block Diagram with Labels

Table 1. Block Diagram Functions

Label Function

A The configuration wizard sets up the initial configuration for the board. From the Output Gain drop-down menu, the reference

gain case be selected. A gain of 1 is the default. After setting up the initial configuration, click Apply and the values are applied.

These settings can be modified at any stage while testing.

B The GPIO buttons act as external GPIO pulses to the LDAC and RESET pins. The LDAC button pushes data from both input

registers (E) to the DAC registers (F). The RESET button clears all data from input registers and DAC registers. These buttons are

live, so there is no need to click Apply Changes (K).

C The Command Option drop-down menu

selects how the data being transferred to the device affects the Input and DAC registers.

After a data value is entered in an input register (see E), this menu determines if the data is transferred to the input register only, or

to the channel input register (E) and channel DAC register (F).

D The Change Page Display drop-down menu selects which page of 4 DAC channel settings are displayed

E The input registers transfer 16-bit data word to the device. Upon clicking the Apply Changes (K), this 16-bit data word is

transferred to the device.

F The DAC registers display the value that is currently present in the DAC register on the device. The DAC registers can be updated

by selecting the appropriate command option or by toggling LDAC (B).

G Software reset returns the board and software to default values. This button is live, so there is no need to click Apply Changes.

H The Load LDAC buttons per channel control to control the loading of Input Register contents to the DAC Register.

I The DAC Configuration options provide access to per channel configuration options such as power-down options and hardware

LDAC mask setting.

J Selecting enabled from the internal reference setting enables the on-chip reference for the board, if disabled is selected, an

external reference must be applied. This control is only available on the AD5676R.

K The Apply Changes button applies all modified values to the device. Note that if an evaluation board is not connected, values

entered into the Input Registers are not transferred to the DAC registers.

UG-814 EVAL-AD5676SDZ/EVAL-AD5676RSDZ User Guide

Rev. A | Page 6 of 12

MEMORY MAP

All registers are fully accessible from the memory map tab; this

allows registers to be edited at a bit level. The bits shaded in

dark gray are read only bits and cannot be accessed from ACE;

all other bits are toggled. Apply Changes is used to transfer data

to the device. All changes here correspond to the block diagram;

for example, if the internal register bit is enabled, it shows as

enabled on the block diagram. Any bits or registers that are in

bold are modified values that have not been transferred to the

board. After Apply Changes is clicked, the data is transferred to

the board.

12993-005

Figure 5. AD5676R Memory Map

12993-106

Figure 6.AD5676R Memory Map with Unapplied Changes in DAC Input 0 Register

Evaluation Board User Guide UG-815

Rev. A | Page 7 of 13

EVALUATION BOARD HARDWARE

POWER SUPPLIES

To use the evaluation board with the SDP-B board, a 6 V dc

power supply is required, which is connected to Connector J3.

The evaluation board can be used without the SDP-B board,

in which case, the J1 and J2 connectors are used as the power

supply inputs.

Both AGND and DGND inputs are provided on the board. The

AGND and DGND planes are connected at onelocation close

to the AD5676/AD5676R. It is recommended that AGND and

DGND not be connected elsewhere in the system toavoid

ground loop problems.

All supplies are decoupled to ground with 10 μF tantalum and

0.1 μF ceramic capacitors.

Table 2. Power Supply Connectors

Connector Number Voltage

J1 External, VLOGIC supply

J2 Analog power supply, VCC

J3 6 V dc board positive power supply

INPUT SIGNALS

When the SDP-B board is used to control the evaluation board,

the digital input signals are applied to Connector J4. When the

SDP-B board is not used, apply the digital signal to Connector J5.

OUTPUT SIGNALS

The DAC output voltages are available on the SMB connectors,

VOUT0 to VOUT7.

EXT_VL

EXT_VDD

DGND

AGND

EXT_REF

+6V

SDP CONNECTOR

EEPROM

REF

ADR431

2.5V REF

10-WAY

HEADER

INTERFACE

AD5675/

AD5675R

12995-002

VOUT0

VOUT1

VOUT6

VOUT7

Figure 7. Evaluation Board Block Diagram

UG-814 EVAL-AD5676SDZ/EVAL-AD5676RSDZ User Guide

Rev. A | Page 8 of 12

LINK CONFIGURATION OPTIONS

Multiple link (LKx) options must be set correctly to select the

appropriate operating setup before using the evaluation board.

The functions of these options are described in Table 3.

SETUP CONDITIONS

Before applying power and signals to the evaluation board,

ensure that all link positions are as required by the operating

mode. There are two modes in which to operate the evaluation

board. The evaluation boards can be operated in SDP controlled

mode to be used with the SDP-B board, or the evaluation board

can be used in standalone mode.

The Default Position column of Table 3 shows the default

positions in which the links are set when the evaluation board

is packaged. When the board is shipped, it is set up to operate

with the SDP-B board in SDP controlled mode.

Table 3. Link Functions

Link No. Function

Default

Position

LK1 This link selects the DAC analog voltage source. A

Position A selects the internal voltage source (INT_VCC) from the ADP3331 (U1).

Position B selects an external supply voltage (EXT_ VCC).

LK2 This link selects the DAC digital voltage source. A

Position A selects the digital voltage source from the SDP-B board (V_IO).

Position B selects an external digital supply voltage (EXT_VLOGIC).

LK3 This link selects the reference source. A/B1

Position A selects the internal reference of the AD5676R as the reference source or an external reference source

from the SMB connector EXT_REF. Use only Position A with the EVAL-AD5676RSDZ.

Position B selects U6 as the 2.5 V reference source. Do not use Position B with the EVAL-AD5676RSDZ.

LK4 This link selects the RSTSEL setting of the AD5676/AD5676R. A

Position A selects DAC power up to zero scale.

Position B selects DAC power up to midscale.

LK5 This link sets the internal gain setting of the AD5676/AD5676R. A

Position A selects software control of the gain via the SDP-B board.

Position B selects a gain of 0 V to 2 × VREF.

Position C selects a gain of 0 V to VREF.

1Position A is the default for the EVAL-AD5676RSDZ. Position B is the default for the EVAL-AD5676SDZ.

EVAL-AD5676SDZ/EVAL-AD5676RSDZ User Guide UG-814

Rev. A | Page 9 of 12

EVALUATION BOARD CIRCUITRY

The E VA L -AD5676SDZ/E VA L-AD5676RSDZ evaluation

boards allow the function and performance of the AD5676/

AD5676R to be easily tested. Each evaluation board contains two

voltage regulators that generate the analog and digital power

supplies and that also power the SDP-B board, if it is connected.

The two regulators are powered via a 6 V supply attached to

Connector J3. Alternatively, a separate analog supply can be

attached via Connector J2, and an external VLOGIC supply can be

connected to Connector J1.

Control of the AD5676/AD5676R is typically performed by the

SDP-B board, which is attached to Connector J4. The SDP-B

board allows the software provided with the kit to be used to

load register values, set the voltage of the DAC outputs, and

write to the control register of the AD5676/AD5676R. When

the SDP-B board is not required, the control signals can be

applied to the AD5676/AD5676R by connecting them to the

relevant pins on Connector J5.

The DAC output voltages are available on the SMB connectors,

VOUT0 to VOUT7.

UG-814 EVAL-AD5676SDZ/EVAL-AD5676RSDZ User Guide

Rev. A | Page 10 of 12

EVALUATION BOARD SCHEMATICS

12993-006

Figure 8. EVAL-AD5676SDZ/EVAL-AD5676RSDZ Schematic, Page 1 of 2

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