資料介紹
Table of Contents
CN0348 Software User Guide
Overview
CN-0348 showcases a solution for precision 16-bit digital-to-analog conversion with wide dynamic signal range in a single supply system. It utilizes a 5V voltage reference (ADR4550), a voltage output digital-to-analog converter (AD5541A), and a rail-rail amplifier as the output buffer (ADA4500-2). The ADA4500-2 exhibits zero crossover distortion and this feature makes it an excellent choice as an output buffer to maintain the linearity of the AD5541A over its input digital code and provide a wide dynamic output range. The combination of parts provides industry-leading 16-bit integral nonlinearity (INL) of ±1LSB and differential nonlinearity (DNL) of ±1LSB with guaranteed monotonicity. This user guide gives information on how to use the evaluation software to collect data from the EVAL-CN0348-SDPZ Daughter Board.
Required Equipment
- EVAL-SDP-CB1Z Controller Board (SDP-B Board)
- EVAL-CN0348-SDPZ Evaluation Board (CN-0348 Board)
-
- (supplied with provided CD in kit)
- PC with the following Minimum Requirements
- Windows XP SP2, Windows Vista or Windows 7
- USB type A Port
- Processor rated at 1GHz or faster
- USB type A to USB type mini-B cable
- SMB Connector
- For INL/DNL data collection:
- GPIB Controller for Hi-Speed USB Type A Connector Cable (NI-488.2 3.1.1 GPIB controller driver is available at https://www.ni.com/en-us/support/model.gpib-usb-hs.html
- Agilent 3458A
NOTE - Any multimeter can be used with this board. However, for INL/DNL measurement, software interface was written with the Agilent 3458A in mind.
Installing the Software
- Open the file setup.exe that is provided from the CD in kit.
NOTE: It is recommended that you install the CN0348 Evaluation Software to the default directory path C:/Program Files/Analog Devices/CN0348/ and all National Instruments products to C:/Program Files/National Instruments/
- Click Next to view the installation review page
- Click Next to start the installation
- Upon completion of the installation of the CN0348 SDP Evaluation Software, the installer for the ADI SDP Drivers will execute.
NOTE: It is recommended that you close all other applications before clicking “Next”. This will make it possible to update relevant system files without having to reboot your computer.
- Click “Next” to set the installation location for the SDP Drivers.
It is recommended that you install the drivers to the default directory path
C:/Program Files/Analog Devices/SDP/DriversR2
- Click “Next” to install the SDP Drivers and complete the installation of all software.
Using the Evaluation Software
Software Control and Indicator Descriptions
- LDAC COntrol
- Always check the box before starting any test
- Write to DAC Button
- Enter the digital input code in “DIN”
- When “WRITE TO DAC” button is clicked, the digital input code is sent to the DAC
- Output Indicator
- The LED string indicates the digital input code being written to the DAC (from bit 15 to bit 0)
- System Status String / LED Indicator
- The string indicator displays a message to the user detailing the current state of the software
- The LED indicator displays the current state of the software in the form of an LED. There are three status LED colors
Inactive
Busy
Error
- Code Step Control
- Enter the code step between each digital input to be written to the DAC
- Agilent 3458A GPIB Address Control
- Enter in the GPIB address of the multimeter
- GPIB Address can be determined from the multimeter by manually pressing down on SHIFT+Local. By default it should be 22
- Current Code / Voltage Indicator
- This indicates the current digital input code and output voltage of the DAC
- File Directory Control
- This allows you to enter the file directory and name to save the INL/DNL measurement data
- INL / DNL measurement graphs
- These graphs display the INL and DNL vs. input digital code when data collection is done
- Transfer Function Graph
- This graph shows the transfer function of the DAC output voltage vs. input digital code
- SDP Board Firmware Information
- This gives you the up to date information on the SDP board firmware
Connecting the Hardware and Taking Measurements
- Connect the SDP Board to the CN0348 Board
- Connect +6V and analog ground to the CN0348 board (J1)
- Connect the USB cable supplied with the SDP board to the USB port on the PC and the SDP board
- Connect Vout (J3) to a multimeter
- Open CN0348.exe. It should be located in C:/Program Files/Analog Devices/CN0348/
- The application will attempt to connect to the board immediately
- Check LDAC box
- Perform functionality test by entering the following in DIN and click WRITE TO DAC
- 0000; multimeter should read close to 0V
- FFFF; multimeter should read close to 5V
- OUTPUT (Bit 15 to Bit 0) should also light up the associated LED indicator
For INL/DNL data collection:
- Connect Vout to the Agilent 3458A multimeter
- Connect the Agilent 3458A to the PC using a GPIB to USB Type A connector (for data collection via Labview software)
- Set the multimeter to have “NPLC” as 1
- Enter GPIB Address of Agilent 3458A.
- Enter desired Code Step
- Code Step = 16 takes about 4min 10sec to finish measurement
- Code Step = 32 takes about 2min 5sec to finish measurement
- Enter the file name and path you want to save data in Enter file name to save data before running
- Click on Start
- Current Code and Current voltage should show the progress of measurements
- To exit, go to File > Exit.
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