User Guide for ANALOG DEVICES models including: AD5781, AD5791, EVAL-AD5781ARDZ Evaluation Controller Board, EVAL-AD5781ARDZ, Evaluation Controller Board, Controller Board, Board
6 hours ago — ... user guide. Both the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ facilitate fast prototyping of the AD5781 and AD5791 circuits, thereby reducing design time. Both ...
il y a 18 heures — The evaluation boards also utilizes external reference boards with an output voltage of 10 V and −10 V. The EVAL-AD5781ARDZ or EVAL-AD5791ARDZ interface to ...
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DocumentDocumentUser Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ Evaluating the AD5781/AD5791 18-Bit/20-Bit, ±0.5 LSB INL/±1 LSB INL Voltage Output DACs FEATURES GENERAL DESCRIPTION Full featured evaluation board for the AD5781 and AD5791 ADP5070 power solution generated from single 5 V supply Various link options PC control in conjunction with the Analog Devices Inc., EVAL- SDP-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 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 or EVAL-AD5791ARDZ facilitate fast prototyping of the AD5781 and AD5791 circuits, thereby reducing design time. Both the EVAL-AD5781ARDZ or EVAL-AD5791ARDZ provides an on-board -14 V and +14 V dual power supply. The evaluation boards also utilizes 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 or 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. TYPICAL EVALUATION SETUP 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. Figure 1. The EVAL-AD5781ARDZ Connected to the SDP-K1 Controller Board Rev. 0 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 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. User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ TABLE OF CONTENTS Features................................................................ 1 Evaluation Kit Contents......................................... 1 Hardware Required............................................... 1 Software Required.................................................1 General Description...............................................1 Typical Evaluation Setup....................................... 1 Getting Started...................................................... 3 Installing the Software........................................ 3 Initial Setup.........................................................3 Evaluation Software...............................................4 INITIAL CONFIGURATION Tab and Description....................................................... 4 Memory Map...................................................... 6 Evaluation Board Hardware...................................7 Power Supplies.................................................. 7 Link Options....................................................... 7 On-Board Connectors........................................ 8 Voltage Reference Daughter Boards..................8 Evaluation Board Schematics................................9 REVISION HISTORY 5/2024--Revision 0: Initial Version analog.com Rev. 0 | 2 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ 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 from 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. Figure 3. Board View of the EVAL-AD5781ARDZ Figure 4. Chip View of the EVAL-AD5781ARDZ Figure 2. ACE Software Main Window analog.com Rev. 0 | 3 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ 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 Button/Function Name INITIAL CONFIGURATION Tab Clear_code clear linearity_comp powerdown_mode coding_select LDAC Figure 5. AD5781 Block Diagram with the INITIAL CONFIGURATION Tab Function Users can initially set the default 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. 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). Click this button for external GPIO pulses to be sent to the CLR pin. 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. This attribute relates to the powerdown attribute. This selects the type of power down when powerdown is 1. Selecting three_state sets the DAC output to tristate mode. Selecting 6kohm_to_gnd sets the DAC output to be clamped to ground through a 6 k resistance and is placed in tristate mode. Use this pull-down menu to set the coding scheme of the DAC register. 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. analog.com Rev. 0 | 4 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ EVALUATION SOFTWARE Table 1. Register Functions (Continued) 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 hexidecimal 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 sets 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. powerdown 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 analog.com Rev. 0 | 5 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ EVALUATION SOFTWARE 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 bit level. The bits shaded in dark gray are read-only bits 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 to 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. Figure 6. AD5781 Memory Map Tab Figure 7. AD5781 Memory Map with Unapplied Changes in the DAC_Register analog.com Rev. 0 | 6 of 16 User Guide EVAL-AD5781ARDZ/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. Table 2. Power Supply Connectors Connector Label External Voltage Supplies Description EXT_VDD External analog positive power supply. Recommended supply is +15 V. AGND EXT_VSS Analog ground. External analog negative power supply. Recommended supply is -15 V. LINK OPTIONS 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. A number of 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 Link Description LK1 This link connects the 5 V supply from SDP-K1 to the on-board ADP5070 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. analog.com Rev. 0 | 7 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ EVALUATION BOARD HARDWARE ON-BOARD CONNECTORS Table 4 shows the connectors on the EVAL-AD5781ARDZ or EVALAD5791ARDZ. Table 4. On-Board Connectors Connector Function J1 to J9 Voltage reference daughter board connectors VOUT VOUT_BUFF DAC output DAC output with amplifier low noise, low drift precision reference with 2 ppm/°C temperature drift and 1.25 V 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 V 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. Figure 8. PMOD Pin Layout Table 5. PMOD Connector Pin Descriptions Pin Number Descriptions 1 SYNCB 2 SDIN 3 SDO 4 SCLK 5, 11 DGND 6, 12 VLOGIC 7 LDAC 8 RESET 9 CLR 10 NC VOLTAGE REFERENCE DAUGHTER BOARDS The daughter boards inserted into the J1, J4 and J9 connectors includes a voltage reference. The voltage supplied by the voltage references are 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 V p-p noise specifications across the operating temperature range. The EV-LTC6655-REFZ and EV-LTZ1000-REFZ reference boards include 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 analog.com Rev. 0 | 8 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ EVALUATION BOARD SCHEMATICS Figure 9. EVAL-AD5781ARDZ and EVAL-AD5791ARDZ Schematic, SDP, Arduino-Compatible, and PMOD Connectors analog.com Rev. 0 | 9 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ EVALUATION BOARD SCHEMATICS analog.com Figure 10. EVAL-AD5781ARDZ Schematic, Main Circuitry Rev. 0 | 10 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ EVALUATION BOARD SCHEMATICS analog.com Figure 11. EVAL-AD5791ARDZ Schematic, Main Circuitry Rev. 0 | 11 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ EVALUATION BOARD SCHEMATICS Figure 12. EVAL-AD5781ARDZ and EVAL-AD5791ARDZ Schematic, Power Circuitry analog.com Rev. 0 | 12 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ EVALUATION BOARD SCHEMATICS Figure 13. EV-ADR445-REFZ Schematic analog.com Rev. 0 | 13 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ EVALUATION BOARD SCHEMATICS Figure 14. EV-LTC6655-REFZ Schematic analog.com Rev. 0 | 14 of 16 User Guide EVAL-AD5781ARDZ/EVAL-AD5791ARDZ EVALUATION BOARD SCHEMATICS analog.com Figure 15. EV-LTZ1000-REFZ Schematic Rev. 0 | 15 of 16 User Guide NOTES EVAL-AD5781ARDZ/EVAL-AD5791ARDZ ©2024 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. One Analog Way, Wilmington, MA 01887-2356, U.S.A. Rev. 0 | 16 of 16
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