Analog Devices EVAL-AD5675SDZ User manual

EVAL-AD5675SDZ/
EVAL-AD5675RSDZ User Guide
UG-815
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluating the AD5675/AD5675R Octal, 16-Bit nanoDAC+
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.Rev. A | Page 1 of 13
FEATURES
Full featured evaluation board for the AD5675/AD5675R
Various link options
PC control in conjunction with the Analog Devices, Inc.,
EVAL-SDP-CB1Z system demonstration platform (SDP)
EVALUATION KIT CONTENTS
AD5675/AD5675R 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
AD5675/AD5675R data sheet
EVAL-AD5675SDZ/EVAL-AD5675RSDZ user guide
Required Software
ACE software
GENERAL DESCRIPTION
This user guide details the operation of the evaluation boards
for the AD5675/AD5675R octal channel, voltage output digital-
to-analog converters (DACs).
The EVAL-AD5675SDZ/E VA L-AD5675RSDZ evaluation
boards help customers to quickly prototype new AD5675/
AD5675R circuits and reduce design time. The AD5675/
AD5675R operate from a single 2.7 V to 5.5 V supply. The
AD5675R has an internal 2.5 V reference giving a maximum
output voltage of 2.5 V or 5 V. The AD5675 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 AD5675/AD5675R 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 AD5675/AD5675R.
The evaluation boards are compatible 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-815 Evaluation Board User Guide
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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 Set Up ................................................................................. 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
3/2015—Revision 0:Initial Version

Evaluation Board User Guide UG-815
Rev. A | Page 3 of 13
TYPICAL EVALUATION SETUP
12995-001
SDP BOARD AD5675R EVALUATION BOARD
POWER SUPPLY CONNECTORS
COM
±25V6V
6.000V 0.250A
Figure 1.

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GETTING STARTED
INSTALLING THE SOFTWARE
The EVAL-AD5675SDZ and EVAL-AD5675RSDZ 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 EVAL-AD5675SDZ and
EVAL-AD5675RSDZ 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 EVAL-AD5675SDZ/
EVAL-AD5675RSDZ 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 AD5675 or AD5675R chip. This view provides a
basic representation of functionality of the board. The
main functions are labeled in Figure 3.
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Figure 2. Board View of the EVAL-AD5675RSDZ
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Figure 3. Chip Block Diagram view for the AD5675R

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BLOCK DIAGRAM AND DESCRIPTION
The E VA L -AD5675SDZ/E VA L-AD5675RSDZ software is
organized so that it appears similar to the functional block
diagram shown in the data sheets. 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 AD5675/AD5675R data sheets.
Some of the blocks and their functions are described here as
they pertain to the evaluation board. The full screen block
diagram shown in Figure 4 and Table 1 describes the
functionality of each block.
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A
B
C
D
EF
GHI
J
K
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.

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Label Function
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 AD5675R.
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.
MEMORY MAP
All registers are fully accessible from the memory map tab, this
allows the registers to be edited at a bit level. The bits shaded in
dark grat are read only bits and cannot be accessed from the
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.
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Figure 5. AD5675R Memory Map
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Figure 6. AD5675R Memory Map with Unapplied Changes in DAC0 Input
Register

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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 one location close
to the AD5675/AD5675R. It is recommended that AGND and
DGND not be connected elsewhere in the system to avoid
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, V
LOGIC
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 AGND
EXT_REF
+6V
SDP CONNECTOR
EEPROM
V
REF
ADR431
2.5V REF
10-WAY
HEADER
I
2
C
INTERFACE
AD5675/
AD5675R
12995-002
VOUT0
VOUT1
VOUT6
VOUT7
Figure 7. Evaluation Board Block Diagram

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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 board 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 boards 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 ADP7104 (U3).
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 power-on voltage for the DAC outputs. B
Position A selects midscale as the power-on voltage for the DAC outputs
Position B selects 0 V as the power-on voltage for the DAC outputs
LK4 This link selects the reference source. A/B1
Position A selects the internal reference of the AD5675R as the reference source or an external reference source
from the SMB connector EXT_REF. Use only Position A with the EVAL-AD5675RSDZ.
Position B selects U5, the ADR431, as the 2.5 V reference source. Do not use Position B with the EVAL-AD5675RSDZ.
LK5 This link selects the gain setting of the AD5675/AD5675R. A
Position A allows the SDP software to set the state of RSTSEL.
Position B selects a DAC output span of 0 V to 2 × VREF.
Position C selects a DAC output span of 0 V to VREF.
1Position A is the default for the EVAL-AD5675RSDZ. Position B is the default for the EVAL-AD5675SDZ.

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EVALUATION BOARD CIRCUITRY
The E VA L -AD5675SDZ/E VA L-AD5675RSDZ evaluation boards
allow the function and performance of the AD5675/AD5675R
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 AD5675/AD5675R 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 AD5675/AD5675R. When
the SDP-B board is not required, the control signals can be
applied to the AD5675/AD5675R by connecting them to the
relevant pins on Connector J5.
The DAC output voltages are available on the SMB connectors,
VOUT0 to VOUT7.

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EVALUATION BOARD SCHEMATICS
12995-006
Figure 8. EVAL-AD5675SDZ/EVAL-AD5675RSDZ Schematic, Page 1 of 2