ANALOG DEVICES EVAL-AD5781ARDZ Evaluation Controller Board User Guide

ANALOG DEVICES EVAL-AD5781ARDZ Evaluation Controller Board

Product Information

• Specifications:
  • Product Name: EVAL-AD5781ARDZ/EVAL-AD5791ARDZ Output DACs
  • Power Supply: Single 5V supply
  • DAC Resolution: AD5781 (18-bit), AD5791 (20-bit)
  • Power Supply on Evaluation Board: -14V and +14V dual power supply
  • External Reference Board Output Voltage: +10V and -10V

Product Usage Instructions

• Hardware and Software Requirements:
  • To use the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ, you will need the following:
  • EVAL-SDP-CK1Z (SDP-K1) controller board (purchased separately)
  • Analysis | Control | Evaluation (ACE) Software (available for download)
• Typical Evaluation Setup:
  • Refer to the AD5781 or AD5791 data sheets in conjunction with the user guide for a detailed evaluation setup. The evaluation boards are designed to facilitate fast prototyping of circuits.
• Getting Started:
  • Installing the Software: Download and install the ACE Software from the product page.
  • Initial Setup: Connect the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ to the SDP-K1 controller board as shown in Figure 1.
  • Evaluation Software: Use the ACE Software for control and analysis of the DACs.
• Evaluation Board Hardware:
  • The evaluation board features:
  • Power Supplies: -14V and +14V dual power supply
  • Link Options: Various link options for connectivity
  • On-Board Connectors: Connectors for interfacing with external devices
  • Voltage Reference Daughter Boards: External reference boards with +10V and -10V output

FAQs

• Q: What are the main features of the EVAL-AD5781ARDZ/EVAL-AD5791ARDZ?
  • A: The main features include full-featured evaluation boards for the AD5781 and AD5791 DACs, power solution from a single 5V supply, PC control with compatible controller boards, and external reference boards for voltage output.
• Q: How can I obtain the ACE Software for the evaluation boards?
  • A: The ACE Software can be downloaded from the product page of EVAL-AD5781ARDZ or EVAL-AD5791ARDZ.

FEATURES

• Full-featured evaluation board for the AD5781 and AD5791
• ADP5070 power solution generated from a single 5 V supply
• Various link options
• PC control in conjunction with the Analog Devices Inc., EVALSDP- CK1Z (SDP-K1) controller board

EVALUATION KIT CONTENTS

• EVAL-AD5781ARDZ or EVAL-AD5791ARDZ evaluation board
• EV-ADR445-REFZ reference board

HARDWARE REQUIRED

• EVAL-SDP-CK1Z (SDP-K1) controller board, which must be purchased separately
• PC running on Windows® 10 (32-bit or 64-bit) or later

SOFTWARE REQUIRED

• Analysis | Control | Evaluation (ACE) Software, which is also available for download from the EVAL-AD5781ARDZ or EVALAD5791ARDZ product page

GENERAL DESCRIPTION

• The operation of the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ for the AD5781 (18-bit) and AD5791 (20-bit), bipolar voltage output, digital-to-analog converters (DACs) are detailed in this user guide.
• Both the EVAL-AD5781ARDZ and EVAL-AD5791ARDZ facilitate fast prototyping of the AD5781 and AD5791 circuits, thereby reducing design time. Both the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ provide an on-board −14 V and +14 V dual power supply. The evaluation boards also utilize external reference boards with an output voltage of +10 V and −10 V.
• The EVAL-AD5781ARDZ or EVAL-AD5791ARDZ interface to the USB port of a PC via a system demonstration platform (SDP-K1) controller board. The Analysis | Control | Evaluation (ACE) software is available for download from both the EVAL-AD5781ARDZ and EVAL-AD5791ARDZ product pages.
• This software enables the user to program the AD5781 and AD5791, respectively. A peripheral module interface (PMOD) connection is also available that allows the connection of different microcontrollers to the evaluation boards without the SDP-K1 controller board. Note that when a microcontroller is used through the PMOD connection, the SDP-K1 controller board must be disconnected, and the user cannot use the ACE software.
• For full details, see the AD5781 or the AD5791 data sheets, which must be used in conjunction with this user guide when using the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ evaluation boards.

TYPICAL EVALUATION SETUP

• DOCUMENT FEEDBACK.
• TECHNICAL SUPPORT.

Information furnished by Analog Devices is believed to be accurate and reliable “as is”. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications are subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

REVISION HISTORY

• 5/2024—Revision 0: Initial Version

GETTING STARTED

INSTALLING THE SOFTWARE

• The EVAL-AD5781ARDZ and EVAL-AD5791ARDZ use the ACE Software, a software application that allows the evaluation and control of multiple evaluation systems.
• The ACE Software is available for download from the EVALAD5781ARDZ and EVAL-AD5791ARDZ product page or the ACE Software web page.
• The ACE Software installer installs the necessary SDP drivers and the Microsoft®.
• NET Framework 4 by default. The ACE Software must be installed before connecting the SDP-K1 controller board to the USB port of the PC to ensure that the SDP-K1 controller board is recognized when connected to the PC. For full instructions on how to install and use this software, see the ACE Software web page on the Analog Devices, Inc., website.
• After the installation is finished, run the ACE Software and the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ plug-in appears automatically.

INITIAL SETUP

To set up the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ, take the following steps:

1. Connect the evaluation board to the SDP-K1 controller board, and then connect the USB cable between the SDP-K1 controller board and the PC.
2. Run the ACE Software application. The EVAL-AD5781ARDZ or EVAL-AD5791ARDZ plug-ins appear in the attached hardware section of the Start tab, as shown in Figure 2.
3. Double-click the board plug-in to open the Board View seen in Figure 3.
4. Double-click the AD5781 or the AD5791 chip to access the chip block diagram shown in Figure 4. This view provides a basic representation of the functionality of the board, together with the INITIAL CONFIGURATION view. See Figure 5 and Table 1 for details on the registers of the board.

EVALUATION SOFTWARE

INITIAL CONFIGURATION TAB AND DESCRIPTION

• The EVAL-AD5781ARDZ and EVAL-AD5791ARDZ software has an INITIAL CONFIGURATION tab. This tab provides access to the software attributes that align to the registers of the AD5781 or AD5791, as outlined in the AD5781 or AD5791 data sheets.
• This tab simplifies the process of understanding how the attributes of the software directly relate to the registers found in the data sheets. For a full description of each register and its settings, see the AD5781 or AD5791 data sheet.
• Some of the functions are described in this section as these functions pertain to the evaluation board. Changes made in the registers of the INITIAL CONFIGURATION tab are automatically reflected in the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ.

Table 1. Register Functions

configuration for the device within this tab. These settings can be modified at any stage while evaluating the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ. The registers reflected in this window depend on the loaded firmware.
Clear_code| The clear_code register sets the value of the DAC register when the clear button is asserted. The input range for the AD5781 is from 0 to 262143 (0x0 to 0x3FFFF).

The input range for the AD5791 is from 0 to 1048575 (0x0 to 0xFFFFF).

clear| Click this button for external GPIO pulses to be sent to the CLR pin.
linearity_comp| This attribute compensates for varying reference input to improve performance. AD5781 settings: span_upto_10V or span_10V_to_20V.

AD5791 settings: span_upto_10V , span_12V_to_16V , span_16V_to_19V , or span_19V_to_20V.

powerdown_mode| This attribute relates to the power-down attribute. This selects the type of power down when power down  is 1. Selecting three_state sets the DAC output to tristate mode.

Selecting 6kohm_to_gnd sets the DAC output to be clamped to the ground through a 6 kΩ resistance and is placed in tristate mode.

coding_select| Use this pull-down menu to set the coding scheme of the DAC register.
LDAC| Click this button for external GPIO pulses to be sent to the LDAC pin. The LDAC button pushes data from the input register to the DAC register. In the software, this button is only required if the Direct Register Access section is used.
Button/Function Name| Function
---|---
raw| This field allows users to set the value of the DAC register. The input is decimal by default; however, the hexadecimal value can also be used by inserting 0x as the prefix.

The input range for the AD5781 is from 0 to 262143 (0x0 to 0x3FFFF). The input range for the AD5791 is from 0 to 1048575 (0x0 to 0xFFFFF).

scale| This field allows users to represent the value of the DAC LSB in mV. This field is a read-only attribute. Note that this field is only applicable if a reference board is used.
offset| This field allows users to set the position of the zero-scale. The unit is in code. This field is a read-only attribute. Note that this field is only applicable if a reference board is used.
power down| This pulldown menu allows users to power down the output stage of the device based on the setting of the powerdown_mode attribute.
Voltage Output (V)| This field represents the calculated value across the output of the DAC. This value can be computed by ( raw + offset ) × scale. This field is a read-only attribute. Note that this is only applicable if a reference board is used.
Direct Register Access| This section can be used to manually write to or read from a register in the AD5781 or AD5791. It is recommended to use this tab for debugging purposes only, which may cause inconsistency between the value of the attributes and the DAC registers

MEMORY MAP

• All registers are fully accessible from the AD5781 Memory Map or AD5791 Memory Map tab, see Figure 6. This tab allows registers to be edited at the bit level. The bits shaded in dark grey are read-only and cannot be accessed from the ACE Software. All other bits are toggled.
• Click Apply Changes to transfer data to the device. All changes or configurations made in the AD5781 Memory Map or AD5791 Memory Map tab are not reflected in the INITIAL CONFIGURATION tab. Any bits or registers that are shown in bold in the AD5781 Memory Map or AD5791 Memory Map tab are modified values that have not been transferred to the evaluation board (see Figure 7). Click Apply Changes to transfer the data to the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ.
• The AD5781 Memory Map or AD5791 Memory Map and bit field tabs serve as tools for debugging purposes only. These tabs can cause glitches in the INITIAL CONFIGURATION tab functions in the user interface. The INITIAL CONFIGURATION tab is still the recommended tab for use for quick evaluation of the EVALAD5781ARDZ or EVAL-AD5791ARDZ.

EVALUATION BOARD HARDWARE

POWER SUPPLIES

• The EVAL-AD5781ARDZ and EVAL-AD5791ARDZ provide −14 V and +14 V supplies using the on-board ADP5070 from a single 5
• V supply sourced from the SDP-K1 controller board. If a different supply is required or if the evaluation board is controlled through the PMOD connector, an external supply must be provided by the external supply voltage (EXT_VDD and EXT_VSS) connector. See
• Table 2 for more details.
• Every supply is decoupled to ground with 10 μF and 0.1 μF capacitors.
• Note that when supplying beyond the 14 V to 16 V range across EXT_VDD, it is recommended to use an external voltage reference.

Table 2. Power Supply Connectors

LINK OPTIONS

Several link options are incorporated on the EVALAD5781ARDZ or EVAL-AD5791ARDZ and must be set for the required operating conditions before using the board. The functions of these link options are described in Table 3.

Table 3. Link Functions

](https://www.analog.com/en/products/adp5070.html)DC-to-DC converter supply. This link is connected by default.
LK2| This link selects the VDD power supply source. Two options are available, as follows: Position 1-2 selects the on-board power supply, LDO_VDD (default). Position 2-3 selects the external power supply, EXT_VDD.
LK3| This link selects the VSS power supply source. Two options are available, as follows: Position 1-2 selects the on-board power supply, LDO_VSS (default). Position 2-3 selects the external power supply, EXT_VSS.

ON-BOARD CONNECTORS

Table 4 shows the connectors on the EVAL-AD5781ARDZ or EVALAD5791ARDZ.

Table 4. On-Board Connectors

VOLTAGE REFERENCE DAUGHTER BOARDS

• The daughter boards inserted into the J1, J4 and J9 connectors include a voltage reference. The voltage supplied by the voltage references is gained up and inverted to provide both the positive and negative reference voltages required by the AD5781 and AD5791.
• The EVAL-AD5781ARDZ and EVAL-AD5791ARDZ evaluation kits include the EV-ADR445-REFZ reference board to complete the hardware required to evaluate the AD5781 and AD5791, respectively.
• The ADR445 is a 5 V low noise reference with 3 ppm/°C maximum temperature drift and 2.25 μV p-p noise specifications across the operating temperature range.
• The EV-LTC6655-REFZ and EV-LTZ1000-REFZ reference boards including the LTC6655 and LTZ1000 voltage references, respectively, are also available to evaluate the AD5781 and AD5791. These boards can be purchased separately via the EVAL-AD5781 and EVAL-AD5791 web pages.
• The LTC6655 reference board offers improved noise and temperature drift performance over the ADR445 solution. The LTC6655 is a low noise, low drift precision reference with 2 ppm/°C temperature drift and 1.25 μV p-p noise.
  • The LTZ1000 reference board components maintain the accuracy of the AD5781 and AD5791. The LTZ1000 is a 7.2 V ultraprecision reference specified with 0.05 ppm/°C temperature drift and ultralow 1.2 μV p-p noise. the LTZ1000 voltage reference is used in conjunction with low-drift amplifiers (ADA4077-2) and a low-drift, thermally matched resistor for the scaling and gain circuits. Place a cover over the reference board to reduce thermal errors due to air current flowing over the reference board.

EVALUATION BOARD SCHEMATICS

Figure 9. EVAL-AD5781ARDZ and EVAL-AD5791ARDZ Schematic, SDP, Arduino- Compatible, and PMOD Connectors

Figure 10. EVAL-AD5781ARDZ Schematic, Main Circuitry

Figure 11. EVAL-AD5791ARDZ Schematic, Main Circuitry

Figure 12. EVAL-AD5781ARDZ and EVAL-AD5791ARDZ Schematic, Power Circuitry

Figure 13. EV-ADR445-REFZ Schematic

Figure 14. EV-LTC6655-REFZ Schematic

Figure 15. EV-LTZ1000-REFZ Schematic

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