This version (09 Jan 2021 00:52) was approved by Robin Getz.The Previously approved version (30 Sep 2013 15:08) is available.
Table of Contents
AD5780 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design
Supported Devices
Evaluation Boards
Overview
This document presents the steps to setup an environment for using the EVAL-AD5780SDZ evaluation board together with the Xilinx KC705 FPGA board and the Xilinx Embedded Development Kit (EDK). Below is presented a picture of the EVAL-AD5780SDZ Evaluation Board with the Xilinx KC705 board.
For component evaluation and performance purposes, as opposed to quick prototyping, the user is directed to use the part evaluation setup. This consists of:
- 1. A controller board like the SDP-B ( EVAL-SDP-CS1Z)
- 2. The component SDP compatible product evaluation board
- 3. Corresponding PC software ( shipped with the product evaluation board)
The SDP-B controller board is part of Analog Devices System Demonstration Platform (SDP). It provides a high speed USB 2.0 connection from the PC to the component evaluation board. The PC runs the evaluation software. Each evaluation board, which is an SDP compatible daughter board, includes the necessary installation file required for performance testing.
Note: it is expected that the analog performance on the two platforms may differ.
Below is presented a picture of SDP-B Controller Board with the EVAL-AD5780SDZ Evaluation Board.
The AD5780 is a true 18-bit, unbuffered voltage out Dac that operates from a bipolar supply up to 33V. Both reference inputs are buffered on chip and external buffers are not required.The AD5780 accepts a positive reference input in the range of 5V to VDD – 2.5V and a negative reference input in the range of VSS + 2.5v to 0V. The AD5780 offers relative accuracy of +/-1 LSB max and operation is guaranteed monotonic with a ±1 LSB DNL max range specification.
The EVAL-AD5780 evaluation board is a full-featured evaluation board, designed to allow the user to easily evaluate all features of the AD5780 voltage output, 20-bit DAC. The AD5780 pins are accessible at on-board connectors for external connection.
More information
- AD5780 Product Info - pricing, samples, datasheet
Getting Started
The first objective is to ensure that you have all of the items needed and to install the software tools so that you are ready to create and run the evaluation project.
Required Hardware
- FMC-SDP adapter board
- EVAL-AD5780 evaluation board
Required Software
- Xilinx ISE 14.6.
- UART Terminal (Termite/Tera Term/Hyperterminal), baud rate 115200.
- The EVAL-AD5780 reference project for Xilinx KC705 FPGA.
Downloads
- Xilinx Boards Common Drivers: https://github.com/analogdevicesinc/no-OS/tree/master/platform_drivers/Xilinx/SDP_Common
- EDK KC705 Reference project: https://github.com/analogdevicesinc/fpgahdl_xilinx/tree/master/cf_sdp_kc705
Run the Demonstration Project
Hardware setup
Before connecting the ADI evaluation board to the Xilinx KC705 make sure that the VADJ_FPGA voltage of the KC705 is set to 3.3V. For more details on how to change the setting for VADJ_FPGA visit the Xilinx KC705 product page.
- Use the FMC-SDP interposer to connect the ADI evaluation board to the Xilinx KC705 board on the FMC LPC connector.
- Connect the JTAG and UART cables to the KC705 and power up the FPGA board.
To power on the EVAL-AD5780 evaluation board, you need to provide external differential supply voltage to J2 connector(for more information see: EVAL-AD5780SDZ evaluation board user guide) and a 5V reference voltage to VREF connector on the evaluation board. VREFN will be connected to AGND (LK8 option=B, LK2 option=B, LK3 option=B, LK4 inserted).
Reference Project Overview
The following commands were implemented in this version of EVAL-AD5780 reference project for Xilinx KC705 FPGA board.
| Command | Description |
|---|---|
| help? | Displays all available commands. |
| reset! | Resets the device. |
| coding= | Selects the coding style. Accepted values: 0 - Two's complement coding.(default) 1 - Offset binary coding. |
| coding? | Display the current coding style. |
| register= | Writes to the DAC register. Accepted values: 0 .. 262143 - the value written to the DAC. |
| register? | Displays last written value to the DAC register. |
| voltage= | Sets the DAC output voltage. Accepted values: -10 .. +10 - desired output voltage in volts. |
| voltage? | Displays the output voltage. |
| output= | Selects the DAC output state. Accepted values: 0 - Normal state. 1 - Clamped via 6KOhm to AGND.(default) 2 - Tristate. |
| output? | Displays the DAC output state. |
| rbuf= | Sets/resets the RBUF bit from control register. Accepted values: 0 - RBUF is reset. 1 - RBUF is set.(default) |
| rbuf? | Displays the value of RBUF bit from control register. |
Commands can be executed using a serial terminal connected to the UART peripheral of Xilinx KC705 FPGA.
The following image shows a generic list of commands in a serial terminal connected to Xilinx KC705 FPGA's UART peripheral.
Software Project Setup
The hardware platform for each reference projects with FMC-SDP interposer and KC705 evaluation board is common. The next steps should be followed to recreate the software project of the reference design:
- First download the KC705 Reference project from Github on your computer. You can do this by clonning this repository: https://github.com/analogdevicesinc/fpgahdl_xilinx.
- From this entire repository you will use cf_sdp_kc705 folder. This is common for all KC705 projects.
- Open the Xilinx SDK. When the SDK starts, it asks you to provide a folder where to store the workspace. Any folder can be provided. Make sure that the path where it is located does not contain any spaces.
- In the SDK select the File→Import menu option to import the software projects into the workspace.
- In the Import window select the General→Existing Projects into Workspace option.
- In the Import Projects window select the cf_sdp_kc705 folder as root directory and check the Copy projects into workspace option. After the root directory is chosen the projects that reside in that directory will appear in the Projects list. Press Finish to finalize the import process.
- The Project Explorer window now shows the projects that exist in the workspace without software files.
- Now the software must be added in your project. For downloading the software, you must use 3 links from Github given in Downloads section. From there you'll download the specific driver, the specific commands and the Xilinx Boards Common Drivers(which are commons for all Xilinx boards). All the software files downloaded must be copied in src folder from sw folder.
- Before compilation in the file called Communication.h you have to uncomment the name of the device that you currently use. In the picture below there is an example of this, which works only with AD5629R project. For another device, uncomment only the respective name. You can have one driver working on multiple devices, so the drivers's name and the uncommented name may not be the same for every project.
- The SDK should automatically build the project and the Console window will display the result of the build. If the build is not done automatically, select the Project→Build Automatically menu option.
- If the project was built without any errors, you can program the FPGA and run the software application.
More information
- Example questions:
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resources/fpga/xilinx/interposer/ad5780.txt · Last modified: 09 Jan 2021 00:48 by Robin Getz