Analog Devices EVAL-AD5423SDZ User manual

EVAL-AD5423SDZ Evaluation Board User Guide
UG-1554
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluating the AD5423 Single Channel, 16-Bit Current or Voltage Output DAC with
HART Connectivity
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 19
FEATURES
Fully featured evaluation board for the AD5423
On board 2.5 V ADR4525 reference
ACE software for control
EVALUATION KIT CONTENTS
EVAL-AD5423SDZ evaluation board
EQUIPMENT NEEDED
SDP-S controller board
Bench top power supply and connector cables
PC/laptop
DOCUMENTS NEEDED
AD5423 data sheet
ACE user manual
SOFTWARE NEEDED
ACE software
GENERAL DESCRIPTION
This user guide describes the EVAL-AD5423SDZ evaluation
board for the AD5423 single-channel, 16-bit voltage, 16-bit
current output digital-to-analog converter (DAC).
The EVAL-AD5423SDZ (see Figure 1) requires the EVAL-SDP-
CS1Z system demonstration platform (SDP-S) board. The
EVAL-AD5423SDZ interfaces to the USB port of the PC via the
SDP-S board. The Analysis, Control, Evaluation (ACE) software
allows simplified programming of the AD5423, and is available
to use with the EVAL-AD5423SDZ.
For full details on the AD5423, see the AD5423 data sheet.
Consult the data sheet in conjunction with this user guide when
using the EVAL-AD5423SDZ.
EVALUATION BOARD PHOTOGRAPH
20450-001
Figure 1.

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TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Kit Contents................................................................... 1
Equipment Needed........................................................................... 1
Documents Needed.......................................................................... 1
Software Needed............................................................................... 1
General Description......................................................................... 1
Evaluation Board Photograph......................................................... 1
Revision History ............................................................................... 2
Evaluation Board Hardware............................................................ 3
Power Supplies .............................................................................. 3
Serial Communication................................................................. 3
AD5423 Device Address Pins ..................................................... 3
Software Quick Start Procedures.................................................... 5
Installing the ACE Software and EVAL-AD5423SDZ Plugins
......................................................................................................... 5
Initial Setup ....................................................................................5
AD5423 Block Diagram and Functions .........................................7
Initial Configuration.....................................................................9
Setting the DAC Output...............................................................9
Writing to the ADC Configuration Register .......................... 10
Updating Diagnostic Results .................................................... 10
Example Sequences .................................................................... 10
ACE Tool Views.............................................................................. 12
Macro Tool .................................................................................. 12
Register Debugger Tool ............................................................. 12
Events Tool .................................................................................. 12
Evaluation Board Schematics and Artwork................................ 13
Ordering Information.................................................................... 18
Bill of Materials........................................................................... 18
REVISION HISTORY
5/2019—Revision 0: Initial Version

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EVALUATION BOARD HARDWARE
POWER SUPPLIES
The EVAL-AD5423SDZ requires a number of power supply
inputs for the AVDD1, AVDD2, AVSS, and VLOGIC pins on the AD5423.
If there is only one positive rail available, connect the AVDD2 pin
to the AVDD1 pin via the AVDD1-AVDD2-SHRT link on the EVAL-
AD5423SDZ. The VLOGIC supply can be selected from 3.3V_SDP
on the SDP-S board or VLDO, through the JP1 and JP3 jumpers.
See Table 1 for more link options and the default link positions.
EVAL-AD5423SDZ operates with a power supply range from
−33 V on AVSS to +33 V on AVDD1 with a maximum voltage of
50 V between the two rails. AVDD2 requires a voltage between
5 V and 33 V. In a typical operating condition, AVDD2 = 5 V,
AVDD1 = +24 V, and AVSS = −24 V.
SERIAL COMMUNICATION
The SDP-S board handles the communication to the EVAL-
AD5423SDZ via the PC. By default, the SDP-S board handles
the serial port interface (SPI) communication, controls the
RESET pin and the LDAC pin, and monitors the FAULT pin of
the AD5423.
The EVAL-AD5423SDZ can disconnect from the SDP-S board
and drive the digital signals from an external source by
removing the appropriate links on P2 (see Table 2). An option
to tie the RESET pin and the LDAC pin to high or low levels is
available through the S1 switch and the JP11 link.
AD5423 DEVICE ADDRESS PINS
The device address pins (AD0 and AD1) are used in conjunction
with the device address bits within the SPI frame to determine
which AD5423 device is being addressed by the system controller.
The AD0 pin and the AD1 pin can be configured through the
JP12 and JP14 links (see Table 1).
Table 1. EVAL-AD5423SDZ Link Option Functions
Link Default Position Function
AVDD1-AVDD2-SHRT Not inserted Connects the AVDD2 pin to the AVDD1 pin.
JP1 Not inserted Selects 3.3 V from the SDP-S as the source for the VLOGIC pin.
JP2 Inserted Selects the external reference ADR-REF as the input to REFIN.
JP3 Inserted Selects 3.3 V from the VLDO pin of the AD5423 as the source for the VLOGIC pin.
JP4 Not inserted Selects the REFOUT pin as the input to the REFIN pin.
JP5 Inserted Powers external reference ADR-REF from the AVDD2 pin (the maximum supply for the ADR4525 is 15 V).
JP8 Inserted Connects the VIOUT pin to the + VSENSE pin.
JP10 Inserted Connects the –VSENSE pin to the RETURN signal on the EVAL-AD5423SDZ.
JP11 A
Position A connects the LDAC pin to the ground position. Position B connects LDAC to the VLOGIC pin.
JP12 A
Position A connects the AD0 pin to the ground position. Position B connects the AD0 pin to the
VLOGIC pin.
JP14 A
Position A connects the AD1 pin to the ground position. Position B connects the AD1 pin to the
VLOGIC pin.
JP17 Not inserted Connects the AVSS pin to the ground position pin for the unipolar supply option (current output only).
P2 Inserted
Provides options to disconnect from the SDP-S board and to drive digital signals from an
external source.
S1 Up
In the up position, this link connects the RESET pin to the VLOGIC pin.
Middle (default)
In the middle position (default), this link controls the RESET pin via the SDP-S board.
Down
In the right position, this link connects the RESET pin to the ground position pin.

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Table 2. Link Options for P2 Header
Pin No. Position Function
1, 2 Inserted Connects the FAULT signal from the SDP-S to the FAULT pin on the AD5423.
Not inserted Disconnects the FAULT signal from the SDP-S to the FAULT pin on the AD5423.
3, 4 Inserted Connects the RESET signal from the SDP-S to the RESET pin on the AD5423.
Not inserted Disconnects the RESET signal from the SDP-S to the RESET pin on the AD5423.
5, 6 Inserted Connects the LDAC signal from the SDP-S to the LDAC pin on the AD5423.
Not inserted Disconnects the LDAC signal from the SDP-S to the LDAC pin on the AD5423.
7, 8 Inserted Connects the SCLK signal from the SDP-S to the SCLK pin on the AD5423.
Not inserted Disconnects the SCLK signal from the SDP-S to the SCLK pin on the AD5423.
9, 10 Inserted Connects the SDO signal from the SDP-S to the SDO pin on the AD5423.
Not inserted Disconnects the SDO signal from the SDP-S to the SDO pin on the AD5423.
11, 12 Inserted Connects the SDI signal from the SDP-S to the SDI pin on the AD5423.
Not inserted Disconnects the SDI signal from the SDP-S to the SDI pin on the AD5423.
13, 14 Inserted Connects the SYNC signal from the SDP-S to the SYNC pin on the AD5423.
Not inserted Disconnects the SYNC signal from the SDP-S to the SYNC pin on the AD5423.

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SOFTWARE QUICK START PROCEDURES
INSTALLING THE ACE SOFTWARE AND
EVAL-AD5423SDZ PLUGINS
The EVAL-AD5423SDZ board uses Analog Devices, Inc., ACE
software. For instructions on how to install and use the ACE
software, go to www.analog.com/ACE.
When the installations are finished, the EVAL-AD5423SDZ
plugin will appear when you open the ACE software.
INITIAL SETUP
To set up the EVAL-AD5423SDZ, take the following steps:
1. Connect a USB cable to the PC and then to the SDP-S board.
2. Connect the SDP-S board to the EVAL-AD5423SDZ. The
PC recognizes the EVAL-AD5423SDZ.
3. Power up the EVAL-AD5423SDZ with the power supplies
recommended in the Power Supplies section.
4. Open the ACE software. The EVAL-AD5423 SDZ appears
in the Attached Hardware pane of the ACE window.
20450-002
Figure 2. EVAL-AD5423SDZ Plugin Not Installed
5. When setting up the evaluation board for the first time, it
can be required to install the EVAL-AD5423SDZ plugin. If
the plugin appears as shown in Figure 5, then proceed to
Step 7. If the plugin appears as shown in Figure 2, click on
the button circled in red and the pop-up window shown in
Figure 3 appears. Click Yes.
20450-003
Figure 3. Installing the Plugin Pop-Up Window
6. The plugin manager window appears, as shown in Figure 4.
7. Find and select the Board.AD5423 plugin and click Install
Selected. The EVAL-AD5423SDZ plugin is now installed
and displays as shown in Figure 5.
20450-004
Figure 4. Plugin Manager Window

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20450-005
Figure 5. Attached Hardware Section with the EVAL-AD5423SDZ
Plugin Connected
8. Double-click EVAL-AD5423SDZ to open the AD5423 block
diagram (see Figure 6). The INITIAL CONFIGURATION
pane appears on the left side of the ACE window. Several
register settings can be configured in this pane and are
written to the device in the appropriate order. The RESET_
OCCURED and CAL_MEM_UNREFRESHED LED
indicators in the DIGITAL DIGNOSTIC RESULTS pane are
illuminated red by default.
9. Write the initial configuration values to clear these error
flags. If the device is power cycled, or if the USB cable is
disconnected and reconnected while the ACE software is
open, contact with the EVAL-AD5423SDZ is lost. To
regain contact, click the System tab, then click the USB
symbol on the EVAL-AD5423SDZ, and then click Acquire.
2
0450-006
Figure 6. AD5423 Block Diagram in the ACE Software

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AD5423 BLOCK DIAGRAM AND FUNCTIONS
The EVAL-AD5425SDZ plugin is organized to appear similar to
the block diagram shown in the AD5423 data sheet. This graphical
user interface (GUI) correlates the functions of the EVAL-
AD5423SDZ with the descriptions in the AD5423 data sheet.
Full descriptions of each block and register setting are available
in the AD5423 data sheet. The full screen AD5423 block
diagram with labels is shown in Figure 7. Table 3 and Table 4
describe the functionality of each block.
20450-007
Figure 7. AD5423 Block Diagram with Labels
Table 3. AD5423 Block Diagram Label Functions (See Figure 7)
Figure
Label Function
A To apply any changes made to the block diagram or to register values in the memory map to the device, click Apply Changes.
B To read back all of the registers of the device, click Read All.
C Click Reset Chip to reset the AD5423. The Reset Chip button has the same functionality as the software reset of the AD5423.
D Click Diff to show the registers that are different from the data stored on the device. This function shows what has changed since
the last register read.
E Click Software Defaults to load the software defaults of the device. These values are not written to the hardware. Click Apply Changes
to write the software default values to the hardware.
F The AD0 and AD1 checkboxes set the AD5423 address of the device and must correspond to the JP12 and JP14 links on the
hardware. If either checkbox is selected, this represents a high state. If either box is not selected, this represents a low state.
G If the /RESET checkbox is selected, the SDP-S board sets the RESET pin high. Otherwise, the SDP-S board pulls the RESET pin low.
H If the /LDAC checkbox is selected, the SDP-S board sets the LDAC pin high. Otherwise, the SDP-S board pulls the LDAC pin low.
I The EVAL-AD5425SDZ plugin monitors the FAULT pin. If the FAULT pin is low, the /FAULT indicator LED lights up red.
K VI_OUT displays the calculated output at VIOUT, and displays if the output is in voltage, milliamps, or is high impedance (high-Z).

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Figure
Label Function
Lx GUI access on several registers. Pop-ups, dropdown menus, and hexadecimal textboxes are available in the GUI to configure
several registers of the AD5423. To write the changes to the device, click Apply Changes. The functions within the GUI that
control various registers are described in Table 4.
M The Calibration Memory Refresh button initiates a write to the key register to perform a calibration memory refresh.
N The SW LDAC button initiates a write to the key register to perform a software LDAC command.
O The NOP Command button initiates a write to Address 0x00 for a no operation (NOP) command.
P The Configure ADC button writes the data selected in the ADC Config menu to the ADC configuration register.
Q Two Stage Readback Select menu. A two-stage readback is initiated through the two-stage readback select register. Click
Readback to initiate a write to the two-stage readback select register and issue a no operation command.
R DIGITAL DIAGNOSTIC RESULTS menu. Click Update and Readback Digital Diagnostic Result to trigger a write 1 to clear
operation on the selected checkboxes and a readback from the digital diagnostic result register.
S ANALOG DIAGNOSTIC RESULTS menu. Click Update and Readback Analog Diagnostic Result to trigger a write 1 to clear
operation on the selected checkboxes and a readback from the analog diagnostic result register.
T When the HART_EN checkbox is selected, the HART_EN bit = 1 in the General-Purpose Configuration 1 register.
U Click Proceed to Memory Map to open the AD5423 memory map (see Figure 8).
V Click Example Sequences to open the example sequences window (see Figure 13).
Table 4. Register Controls Accessible via the GUI (See Label Lx in Table 3 and in Figure 7)
Figure
Label Function
L1 Diagnostic Configuration. Click this button to activate the associated pop-up menu.
L2 GP Config. When this button is clicked, a pop-up menu appears to configure the general-purpose configuration registers.
L3 Key register menu. When this menu is clicked, a dropdown menu appears to configure the key register.
L4 Fault Pin Config. When this button is clicked, a pop-up menu appears to configure the general-purpose configuration registers.
L5 WDT Config. When this button is clicked, a pop-up menu appears to configure the general-purpose configuration registers.
L6 Frequency Monitor menu. This menu displays the value in the frequency monitor when read.
L7 Clear Code menu. Use the textbox in this menu to insert a clear code value in hexadecimal format.
L8 User Gain menu. Use the textbox in this menu to insert a user gain value in hexadecimal format.
L9 User Offset menu. Use the textbox in this menu to insert a user offset value in hexadecimal format.
L10 DAC Input Reg menu. Use the textbox in this menu to insert the DAC value in hexadecimal format.
L11 16 Bit DAC. When this button is clicked, a pop-up menu appears to configure the general-purpose configuration registers.
L12 DAC Output Reg. This menu displays the hexadecimal value currently set in the DAC output register.
L13 Status Register. This menu displays the contents of the status register.
L14 ADC Config. This menu contains a combination of dropdown menus and a textbox in which to enter the sequence data.

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2
0450-008
Figure 8. AD5423 Memory Map in the ACE Software
INITIAL CONFIGURATION
An initial configuration wizard is available when the AD5423
plugin opens that allows quick configuration of the AD5423, and
provides configuration for the clock output in the general-purpose
configuration register, the DAC configuration register, and the
DAC input register. Click Apply to initiate the configured settings
in the order of the recommended power-up sequence on the
AD5423 data sheet.
SETTING THE DAC OUTPUT
To configure the DAC output, use the DAC Config Register
pop-up menu (see Figure 9). Click the 16 Bit DAC block in the
block diagram to display the DAC configuration register. Select
the appropriate settings and click Apply Changes. It is
recommended to disable the output until the correct value in
the DAC input register is written to the device.
To change the DAC voltage or current output level, write the
appropriate hexadecimal code to the DAC input register, and
then click Apply Changes. Click SW LDAC to issue a software
LDAC command, or pull the LDAC pin low to update the DAC
output register with the values in the DAC input register. To
enable the DAC output, select the OUT_EN (Enable VI_OUT)
checkbox, and then click Apply Changes. The programmed
voltage or current is then reflected at the VIOUT pin.
20450-009
Figure 9. AD5423 DAC Config Register Pop-Up Menu

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WRITING TO THE ADC CONFIGURATION REGISTER
The procedure to set up and configure the ADC input node is
discussed in the AD5423 data sheet. For this reason, writing to
the ADC configuration register through the Apply Changes
function is disabled.
The dropdown list in the SEQUENCE_COMMAND section
contains only an initiate single conversion command
(INITIATE_SINGLE_CON). The hexadecimal text box in the
SEQUENCE_DATA pane is unused and remains at 0. Use the
dropdown list in the ADC_IP_SELECT pane to select the desired
input node for the ADC to convert. Click Configure ADC to
initiate a write to the ADC configuration register. A register
read must be performed to see the ADC result in the status
register (see Figure 10).
20450-010
Figure 10. AD5423 ADC Configuration Register
UPDATING DIAGNOSTIC RESULTS
The AD5423 has a digital diagnostic results register and an
analog diagnostic results register that contain error flags for the
on-chip digital and analog diagnostic features. Write 1 to the
respective error flags update the error flag status.
To update the digital and analog diagnostic result registers, click
Update and Readback. This button initiates a write of 1 to the
selected checkboxes and then reads back the updated diagnostic
result. Figure 11 shows the digital diagnostic results register.
Figure 12 shows the analog diagnostic results register.
20450-011
Figure 11. AD5423 Digital Diagnostic Results Register
2
0450-012
Figure 12. AD5423 Analog Diagnostic Results Register
EXAMPLE SEQUENCES
There are several example sequences available. Click Example
Sequences and the window shown in Figure 13 opens. To
enable any of the sequences, click the relevant sequence button,
as shown in Figure 14. The sequence runs immediately and the
output changes accordingly. To return to the main window, click
Back to the AD5423.