This document presents the steps to setup an environment for using the EVAL-AD5780SDZ evaluation board together with the Xilinx KC705 FPGA board, the Xilinx Embedded Development Kit (EDK) and the Micrium µC-Probe run-time monitoring tool. 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:
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.
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.
The following table presents a short description the reference design archive contents.
|Bit||Contains the KC705 configuration file that can be used to program the system for quick evaluation.|
|Microblaze||Contains the EDK 13.4 project for the Microblaze softcore that will be implemented in the KC705 FPGA.|
|Software||Contains the source files of the software project that will be run by the Microblaze processor.|
|uCProbeInterface||Contains the uCProbe interface and the .elf symbols file used by uC-Probe to access data from the Microbalze memory.|
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.
At this point everything is set up and it is possible to start the evaluation of the ADI hardware through the controls in the uC-Probe application provided in the reference design.
Launch uC-Probe from the Start → All Programs → Micrium → uC-Probe.
Select uC-Probe options.
Set target board communication protocol as RS-232
Setup RS-232 communication settings
The following figure presents the uC-Probe interface that can be used for monitoring and controlling the operation of the EVAL-AD5780SDZ evaluation board.
The communication with the board is activated / deactivated by toggling the ON/OFF switch. The Activity LED turns green when the communication is active. If the ON/OFF switch is set to ON and the Activity LED is BLACK it means that there is a communication problem with the board. See the Troubleshooting section for indications on how to fix the communication problems.
The value of the AD5780 DAC Register is changed using the slider located under the DAC Register Value (18-bit) label. The selected value is displayed in the numeric box located next to the slider. Next to it, the value that is read from the DAC register is displayed. The slider will select the DAC value as a binery offset value. In case the coding on the DAC is 2's Complement, the value set and the readback value will differ.
The value of the AD5780 Clearcode Register is changed using the slider located under the Clearcode Register Value (18-bit) label. The selected value is displayed in the numeric box located next to the slider. Next to it, the value that is read from the Clearcode register is displayed.
The sliders Vref+ and Vref- are used to specify the reference voltages set on the evaluation board. The default values are +10V and -10V.
The DAC’s output voltage is displayed in the numeric box having the label Output voltage. This value is computed based on the Vref+ and Vref- values.
The values of the Control Register’s bits are indicated by the LEDs situated under the Control Register label. When a LED id lit it means that the corresponding bit’s value is 1. Each switch under the LEDs can be used to toggle the corresponding bit in the Control register.
The values of the Software Control Register’s bits are indicated by the LEDs situated under the Status Control Register label. When a LED id lit it means that the corresponding bit’s value is 1. Each switch can be used to toggle the corresponding bit in the Software Control Register.
The hardware pins can be controlled by the switches under the label “Hardware pins”. When the switch is active, the corresponding pin will be activated (will be toggled LOW).
In case there is a communication problem with the board the follwing actions can be perfomed in order to try to fix the issues: