EVAL-AD7405FMCZ

EVAL-AD7405FMCZ User Guide UG-690 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Evaluating the AD7405 16-Bit Isolated Sigma-Delta ADC FEATURES EVALUATION BOARD DESCRIPTION Full featured evaluation board for the AD7405 On-board power supplies Standalone capability System demonstration platform (SDP-H1) compatible (EVAL-SDP-CH1Z) PC software for control and data analysis EVAL-AD7405FMCZ evaluation board CD containing evaluation software for the AD7405 The EVAL-AD7405FMCZ is a full featured evaluation board designed to allow the user to easily evaluate all features of the AD7405 isolated analog-to-digital converter (ADC). The evaluation board can be controlled by the EVAL-SDP-CH1Z via the FMCZ connector (J9). The SDP-H1 board (EVAL-SDPCH1Z) allows the evaluation board to be controlled through a USB port of a PC using the evaluation board software available for download from the product page or from the included installer CD included in the evaluation board kit. ADDITIONAL EQUIPMENT NEEDED On-board components include the following: EVAL-SDP-CH1Z, includes a USB cable and 12 V wall wart Signal source PC running Windows XP SP3, Windows Vista, or Windows 7 with USB 2.0 port ADuM6000: isolated iCoupler® 5 kV, dc-to-dc converter ADP2441: 36 V, 1 A, synchronous, step down dc-to-dc regulator ADP7104ARDZ-5.0: 5 V low noise LDO EVALUATION KIT CONTENTS ONLINE RESOURCES Documents Needed AD7405 data sheet EVAL-AD7405FMCZ user guide Required Software EVAL-AD7405FMCZ evaluation software FAQs and Troubleshooting TYPICAL SETUP WALL OUTLET 100V AC TO 240V AC 47Hz TO 63Hz SWITCHING POWER SUPPLY SIGNAL GENERATOR PC RUNNING EVALUALTION BOARD SOFTWARE Figure 1. Typical Setup (EVAL-AD7405FMCZ on Left and EVAL-SDP-CH1Z on Right) PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 20 12304-001 ANALOG FILTER UG-690 EVAL-AD7405FMCZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Setup Conditions ...........................................................................9 Evaluation Kit Contents ................................................................... 1 Evaluation Board Circuitry ........................................................... 10 Additional Equipment Needed ....................................................... 1 Sockets/Connectors ................................................................... 10 Online Resources .............................................................................. 1 Test Points ................................................................................... 10 Evaluation Board Description......................................................... 1 Basic Hardware Setup ................................................................ 11 Typical Setup ..................................................................................... 1 Evaluation Board Software ............................................................ 12 Revision History ............................................................................... 2 Starting the Software .................................................................. 12 Quick Start Guide ............................................................................. 3 Description of Main Window ................................................... 14 Software Installation Procedures ................................................ 4 Generating a Waveform Analysis Report................................ 15 Evaluation Board Setup Procedures........................................... 6 Generating a Histogram of the ADC Code Distribution ..... 16 Evaluation Board Hardware ............................................................ 7 Generating a Fast Fourier Transform of AC Characteristics.. 17 Device Description ....................................................................... 7 Hardware Link Options ............................................................... 7 Generating a Summary of the Waveform, Histogram, and Fast Fourier Transform .............................................................. 18 Power Supplies .............................................................................. 7 Saving Files .................................................................................. 19 Input Signals .................................................................................. 7 Print Screenshot ......................................................................... 19 Link Configuration Options ........................................................... 9 Opening Files .............................................................................. 19 REVISION HISTORY 9/14—Revision 0: Initial Version Rev. 0 | Page 2 of 20 EVAL-AD7405FMCZ User Guide UG-690 QUICK START GUIDE 5. Follow these steps to quickly evaluate the AD7405 ADC: 2. 3. 4. Install the evaluation software from the AD7405 product page or from the included CD. Ensure that the EVAL-SDPCH1Z board is disconnected from the USB port of the PC while installing the software. (The PC may need to be restarted after the installation.) Ensure that the various link options are configured as outlined in Table 2. Connect the EVAL-SDP-CH1Z board to the evaluation board as shown in Figure 2. Connect the EVAL-SDP-CH1Z board to the PC via the USB cable. For Windows® XP, you may need to search for the EVAL-SDP-CH1Z drivers. Choose to automatically search for the drivers for the EVAL-SDP-CH1Z board if prompted by the operating system. 6. 7. 12304-002 1. Power up the EVAL-SDP-CH1Z by inserting the 12 V dc barrel jack (included with EVAL-SDP-CH1Z), into the barrel connector labeled +12V_VIN on the EVAL-SDP-CH1Z. Launch the evaluation software from the Analog Devices subfolder in the Programs menu. Connect an input signal via the VIN+, J1 connector. Figure 2. EVAL-AD7405FMCZ (Left) Connected to the EVAL-SDP-CH1Z Board (Right) Rev. 0 | Page 3 of 20 UG-690 EVAL-AD7405FMCZ User Guide SOFTWARE INSTALLATION PROCEDURES The EVAL-AD7405FMCZ evaluation kit includes a CD containing evaluation software to be installed on your PC before you begin using the evaluation board. There are two parts to the installation: • • EVAL-AD7405FMCZ evaluation software installation EVAL-SDP-CH1Z system demonstration platform board driver installation Warning Installing the EVAL-AD7405FMCZ Evaluation Software 2. Insert the included evaluation software installation CD into the CD drive of a Windows-based PC, and open the contents of the CD. Double-click the setup.exe file to begin the installation. By default, the software is saved to the following location: C:\Program Files\Analog Devices\AD740X\ A dialog box appears asking for permission to allow the program to make changes to your computer. Click Yes to begin the installation process (see Figure 3). 6. A license agreement appears. Read the agreement and then select I accept the License Agreement and click Next. A summary of the installation is displayed. Click Next to continue (see Figure 5). 12304-005 3. Figure 4. Evaluation Software Installation—Destination Directory 5. To install the EVAL-AD7405FMCZ evaluation software, 1. 12304-004 The evaluation board software and drivers must be installed before connecting the evaluation board and EVAL-SDP-CH1Z board to the USB port of the PC to ensure that the evaluation system is correctly recognized when it is connected to the PC. 12304-003 Figure 5. Evaluation Software Installation—Start Installation 7. Figure 3. Evaluation Software Installation—User Account Control Select the location to install the software, and then click Next (see Figure 4). 12304-006 4. A dialog box informs you when the evaluation software installation is complete. Click Next to proceed with the installation of the drivers (see Figure 6). Figure 6. Evaluation Software Installation—Installation Complete Rev. 0 | Page 4 of 20 EVAL-AD7405FMCZ User Guide UG-690 Installing the EVAL-SDP-CH1Z System Demonstration Platform Board Drivers 3. Click Install to proceed with the installation (see Figure 9). After the installation of the evaluation board software is complete, the ADI SDP Drivers Setup Wizard window opens for the installation of the EVAL-SDP-CH1Z system demonstration platform board drivers (see Figure 7). Make sure that all other applications are closed, and then click Next to begin the driver installation process (see Figure 7). 12304-009 1. Figure 9. EVAL-SDP-CH1Z Drivers Installation—Windows Security To complete the drivers installation, click Finish, which closes the installation wizard (see Figure 10). 12304-007 4. Figure 7. EVAL-SDP-CH1Z Drivers Installation—Setup Wizard 12304-010 Select the location to install the drivers, and then click Install (see Figure 8). Figure 10. EVAL-SDP-CH1Z Drivers Installation—Complete 12304-008 2. Figure 8. EVAL-SDP-CH1Z Drivers Installation—Choose Install Location Rev. 0 | Page 5 of 20 UG-690 EVAL-AD7405FMCZ User Guide EVALUATION BOARD SETUP PROCEDURES Verifying the Board Connection The EVAL-AD7405FMCZ connects to the EVAL-SDP-CH1Z system demonstration platform. The EVAL-SDP-CH1Z board is the controller board, which is the communication link between the PC and the main evaluation board. Figure 2 shows a photograph of the connections between the EVAL-AD7405FMCZ daughter board and the EVAL-SDP-CH1Z board. 1. After following the instructions in the Software Installation Procedures section, set up the evaluation and SDP-H1 boards as detailed in this section. 2. Warning The evaluation software and drivers must be installed before connecting the evaluation board and EVAL-SDP-CH1Z board to the USB port of the PC to ensure that the evaluation system is correctly recognized when it is connected to the PC. Connecting the Evaluation and SDP Boards to a PC 2. 3. 4. Ensure that all configuration links are in the appropriate positions (see Table 2). Connect the EVAL-AD7405FMCZ board securely to the J4 FMC connector on the EVAL-SDP-CH1Z board. The EVAL-SDP-CH1Z board requires an external power supply adapter, which is included in the EVAL-SDP-CH1Z kit. Connect this power supply to the dc barrel connector labeled +12V_VIN on the EVAL-SDP-CH1Z board. Connect the EVAL-SDP-CH1Z board to the PC via the USB cable enclosed in the EVAL-SDP-CH1Z kit. 12304-011 1. Allow the Found New Hardware Wizard to run after the EVAL-SDP-CH1Z board is plugged into your PC. (If you are using Windows XP, you may need to search for the EVAL-SDP-CH1Z drivers. Choose to automatically search for the drivers for the EVAL-SDP-CH1Z board if prompted by the operating system.) Check that the board is connected to the PC correctly using the Device Manager of the PC. a. Access the Device Manager as follows: i. Right-click My Computer and then click Manage. ii. A dialog box appears asking for permission to allow the program to make changes to your computer. Click Yes. iii. The Computer Management box appears. From the list of System Tools, click Device Manager. b. Under ADI Development Tools, Analog Devices SDP-H1 should appear (see Figure 11), indicating that the EVAL-SDP-CH1Z driver software is installed and that the board is connected to the PC correctly. Figure 11. Device Manager: Checking That the Board Is Connected to the PC Correctly Disconnecting the EVAL-AD7405FMCZ Board Caution Always remove power from the EVAL-SDP-CH1Z or click the reset tact switch (located alongside the mini-USB port) before removing the EVAL-AD7405FMCZ daughter board. Rev. 0 | Page 6 of 20 EVAL-AD7405FMCZ User Guide UG-690 EVALUATION BOARD HARDWARE DEVICE DESCRIPTION POWER SUPPLIES This user guide describes the evaluation board for the AD7405 isolated ADC. The AD7405 is a second-order, Σ-Δ modulator that converts an analog input signal into a high speed, 1-bit data stream with on-chip digital isolation based on Analog Devices, Inc., iCoupler® technology. The AD7405 operates from a 5 V (VDD1) power supply and accepts a differential input signal of ±250 mV (±320 mV full scale). The differential input is ideally suited to shunt voltage monitoring in high voltage applications where galvanic isolation is required. Take care before applying power and signals to the evaluation board to ensure that all link positions are set according to the required operating mode. See Table 2 for the complete list of link options. The analog input is continuously sampled by a high performance analog modulator, and converted to a ones density, digital output stream with a data rate up to 20 MHz. The original information can be reconstructed with an appropriate digital filter. The serial I/O can use a 5 V or a 3.3 V supply (VDD2). The serial interface is digitally isolated. High speed CMOS, combined with monolithic transformer technology, allows the on-chip isolation provide outstanding performance characteristics, superior to alternatives such as optocoupler devices. The AD7405 device is offered in a 16-lead wide body SOIC package and has an operating temperature range of −40°C to +125°C. This evaluation board is designed to be supplied via the EVALSDP-CH1Z. The EVAL-SDP-CH1Z generates 12 V and 3.3 V supply rails. The 12 V supply is connected to the on-board 5 V linear regulator that supplies the ADuM6000 with power. The ADuM6000 then generates an isolated 5 V supply to power the VDD1 rail of the AD7405. The 3.3 V supply rail from the EVALSDP-CH1Z is used to supply the VDD2 rail of the AD7405. If the user wishes to supply VDD1 externally, an external power supply in the range of 24 V ± 5% may be connected to the HIGH_V connector, J4. Alternatively an external supply in the range of 5 V ±10% may be connected to the J3 connector. The VDD2 supply may also be supplied via an external power supply in the range of 3 V to 5.5 V via the J5 connector. There are two main ground planes, GND1 and GND2. These are isolated planes with a creepage and clearance of 8 mm. Caution Complete specifications for the AD7405 device are provided in the device data sheet, available from Analog Devices, Inc., which should be consulted in conjunction with this user guide when using the evaluation board. Full details on the EVAL-SDPCH1Z are available on the EVAL-SDP-CH1Z product page. When the EVAL-AD7405FMCZ is connected to the EVAL-SDPCH1Z, take care to ensure that if an external voltage is supplied to the J5 input connector, the voltage does not exceed 3.3 V. Exceeding this voltage may cause permanent damage to the EVAL-SDP-CH1Z board. HARDWARE LINK OPTIONS INPUT SIGNALS The functions of the link options are described in Table 2. The default setup is configured to operate the board with the power supplied from the EVAL-SDP-CH1Z board and to supply the analog supply rail (VDD1) via the on-board isoPower ADuM6000. The analog input range to the AD7405 is ±250 mV (±320 mV full scale), which should not be exceeded. An input signal in the range of 500 mV p-p should be connected to the evaluation board via the analog input connector, J1. The EVAL-AD7405FMCZ has analog and digital ground planes that are physically isolated from one other. As such, power to the analog supply rail is by default, supplied through the onboard ADuM6000 isolated iCoupler 5 kV, dc-to-dc converter. VDD1 can optionally be supplied from the J3 external connector or from the J4 high voltage external connector. A 24 V supply connected to J4 is stepped down to 5 V by means of the onboard ADP2441 step-down dc-to-dc regulator. See Table 2 for more information about supplying VDD1 externally. Table 1. External Power Supplies (Optional) Power Supply VDD1 VDD2 Connector J3 J5 HIGH_V (VDD1) J4 Voltage Range 4.5 V to 5.5 V 3 V to 5.5 V 3.3 V ± 5% 24 V ± 5% Purpose Analog supply rail Digital supply rail without EVAL-SDP-CH1Z connected Digital supply rail with EVAL-SDP-CH1Z connected Analog supply rail (high voltage alternative to J5) Rev. 0 | Page 7 of 20 UG-690 EVAL-AD7405FMCZ User Guide LOW VOLTAGE HIGH VOLTAGE MCLK+ MCLK– VIN+ AD7405 VIN– MDAT+ XILINX SPARTAN-6 FPGA MDAT– VDD1 VDD2 GND C A B ADP2241 B A ADuM6000 VDD2 3.3V SUPPLY ADP7104-5.0 12V SUPPLY SDP-H1 BOARD VDD1 GND 12304-012 HIGH-V GND Figure 12. EVAL-AD7405FMCZ Block Diagram Rev. 0 | Page 8 of 20 EVAL-AD7405FMCZ User Guide UG-690 LINK CONFIGURATION OPTIONS There are multiple link options that must be set correctly to select the appropriate operating setup before you begin using the EVAL-AD7405FMCZ evaluation board. The functions of these options are outlined in Table 2. SETUP CONDITIONS Take care before applying power and signals to the evaluation board to ensure that all link positions are as required by the operating mode. There are two modes in which to operate the evaluation board. The evaluation board can be operated in SDP-H1 controlled mode to be used with the EVAL-SDP-CH1Z board, or the evaluation board can be used in standalone mode. The default position column of Table 2 shows the default positions in which the links are set when the evaluation board is packaged. When the board is shipped, it is set up to operate in SDP-H1 controlled mode, with the power supplied from the EVAL-SDP-CH1Z board and the analog supply rail (VDD1) being supplied via the on-board isoPower® ADuM6000 dc-to-dc converter. Table 2. Link Options Category Power Supplies Analog Input Link LK1 Default Position A LK5 Removed LK2 A LK7 LK8 Removed Inserted Function This link selects the AD7405 VDD1 supply source. Remove LK5 if using either Position A or Position B. Position A: VDD1 is supplied from the ADuM6000 on-board device. Position B: VDD1 is supplied externally via Connector J3. When LK5 is inserted, VDD1 is supplied via a step-down dc-to-dc regulator via J4. Remove LK5 if VDD1 is supplied via LK1. Remove LK1 if VDD1 is supplied via LK5. This link selects the AD7405 VDD2 supply source. Position A: VDD2 is supplied from the EVAL-SDP-CH1Z board. Position B: VDD2 is supplied from the on-board 5 V regulator. Position C: VDD2 is supplied externally via Connector J5. When LK7 is inserted, VIN+ is shorted to ground. Remove LK7 if a signal is applied to AIN+. When LK8 is inserted, VIN− is shorted to ground. Remove LK8 if a signal is applied to AIN−. Rev. 0 | Page 9 of 20 UG-690 EVAL-AD7405FMCZ User Guide EVALUATION BOARD CIRCUITRY SOCKETS/CONNECTORS The connectors and sockets on the EVAL-AD7405FMCZ are described in Table 3. Table 3. On-Board Connectors Connector J1 J2 J3 J4 J5 J6 J7 Function Analog input AIN+ Analog input AIN− MCLK input—standalone mode MDAT output—standalone mode VDD1 external source VDD2 external source VDD1 external source—high voltage The default interface to this evaluation board is via the FMC connector, which connects the EVAL-AD7405FMCZ to the EVAL-SDP-CH1Z board. If the EVAL-AD7405FMCZ board is used in standalone mode, communication is achieved via the J3 and J4 SMB jacks. See Table 2 for more information about configuring the evaluation board for standalone mode. TEST POINTS There are several test points on the EVAL-AD7405FMCZ board. These test points provide easy access to the signals from the evaluation board for probing, evaluation, and debugging. Rev. 0 | Page 10 of 20 EVAL-AD7405FMCZ User Guide UG-690 BASIC HARDWARE SETUP The EVAL-AD7405FMCZ connects to the EVAL-SDP-CH1Z system demonstration platform. The EVAL-SDP-CH1Z board is the controller board, which is the communication link between the PC and the main evaluation board. Figure 2 shows a photograph of the connections between the EVAL-AD7405FMCZ daughter board and EVAL-SDP-CH1Z board. The analog input range to the AD7405 is ±250 mV (±320 mV full scale) and should not be exceeded. Connect an input signal in the range of 500 mV p-p to the evaluation board via analog input connector, J1. The EVAL-AD7405FMCZ has analog and digital ground planes physically isolated from one other. As such, power to the analog supply rail is by default, supplied through the on-board ADuM6000 isolated iCoupler® 5 kV, dc-to-dc converter. VDD1 may optionally be supplied from external connector, J3, or high voltage connector, J4. A 24 V supply connected to J4 is stepped down to 5 V by means of the on-board ADP2441 step down dcto-dc regulator. Consult Table 2 if supplying VDD1 externally. If using the evaluation board in default mode of operation, ensure that the link options are in their default positions as outlined in Table 2. Ensure all links are in the appropriate position before connecting the evaluation board to the EVALSDP-CH1Z. Before powering up the EVAL-SDP-CH1Z, connect the EVALAD7405FMCZ to FMC Connector J4 on the EVAL-SDP-CH1Z board. After the evaluation board and the EVAL-SDP-CH1Z board have been connected securely, apply power to the EVALSDP-CH1Z. The EVAL-SDP-CH1Z requires an external power supply adapter, which is included in the EVAL-SDP-CH1Z kit. Connect this power supply to the dc barrel connector labeled +12V_VIN on the EVAL-SDP-CH1Z. Before connecting the EVAL-SDP-CH1Z board to your PC, ensure that the evaluation software (supplied on included CD) has been installed. The full software installation procedure is detailed in the Evaluation Board Software section. Finally, connect the EVAL-SDP-CH1Z board to the PC via the USB cable enclosed in the EVAL-SDP-CH1Z kit. If using a Windows XP platform, you may need to search for the EVAL-SDP-CH1Z drivers. Choose to automatically search for the drivers for the EVAL-SDP-CH1Z board if prompted by the operating system. Caution Always remove power from the EVAL-SDP-CH1Z, or click the reset tact switch (located alongside the mini-USB port) before removing the EVAL-AD7405FMCZ daughter board. Rev. 0 | Page 11 of 20 UG-690 EVAL-AD7405FMCZ User Guide EVALUATION BOARD SOFTWARE STARTING THE SOFTWARE After the EVAL-AD7405FMCZ and EVAL-SDP-CH1Z boards are correctly connected to your PC, the evaluation software can be started. 2. From the Start menu, select Programs > Analog Devices > AD7405. The main window of the software then opens (see Figure 14). If the EVAL-AD7405FMCZ is not connected to the USB port via the EVAL-SDP-CH1Z when the software is launched, a connectivity error displays (see Figure 13). Connect the evaluation board to the USB port of the PC, wait a few seconds, click Rescan, and follow the instructions. 12304-013 1. Figure 13. Connectivity Error Alert Rev. 0 | Page 12 of 20 EVAL-AD7405FMCZ User Guide UG-690 1 4 3 5 2 12304-014 6 Figure 14. Evaluation Software Main Window Rev. 0 | Page 13 of 20 UG-690 EVAL-AD7405FMCZ User Guide Control Buttons, Drop-Down Boxes, and Indicators DESCRIPTION OF MAIN WINDOW The evaluation software includes the following control buttons, drop-down boxes, and indicators. When the software is launched, the main software window opens (see Figure 14). • The evaluation software panel as shown in Figure 14 has the following features: • • • • • Menu bar Control buttons FPGA configuration options Data capture display AC/DC analysis • • Menu Bar The menu bar, labeled 1 in Figure 14, consists of the File, Edit, and Help menus. File Menu • • • • Save Captured Data. Saves captured data in .csv format for future analysis. Load Captured Data. Loads previously captured data in comma separated values (.csv) format for analysis. Take Screenshot. Saves screenshot of window as a .jpeg file. Print Screenshot. Sends screenshot of window to the default printer. Exit. Exits the program. The Eval Board Connected box (labeled 2 in Figure 14) indicates whether the EVAL-AD7405FMCZ board has been detected. The FPGA Settings section (labeled 6 in Figure 14) specifies the MCLK frequency used for the serial interface and the decimation ratio used by the FPGA to filter the data. The Samples drop-down box (labeled 4 in Figure 14) allows selecting the number of samples to be captured in a single acquisition. Clicking Single Capture (see label 5 in Figure 14) initiates the sampling and readback of the number of measurements defined in the Samples box. Clicking Continuous Capture (see label 5 in Figure 14) performs a continuous capture from the ADC. Clicking Continuous Capture a second time to stop sampling. Window Tabs Help Menu There are five tabs available in the tabs area (labeled 3 in Figure 14) of the main window: Configure, Waveform, Histogram, FFT, and Summary. These tabs are used to switch among device configuration, waveform analysis, histogram analysis, FFT analysis, and a summary of the last capture. Each tab is described in more detail in the Generating a Waveform Analysis Report; Generating a Histogram of the ADC Code Distribution; Generating a Fast Fourier Transform of AC Characteristics; and Generating a Summary of the Waveform, Histogram, and Fast Fourier Transform sections. • Graph Tools • Edit Menu • • • Reinitialize to default. Places the evaluation board in a known default state. Analog Devices Website. Opens the Analog Devices website in the default browser. Context Help. Turns on context sensitive help. About. Provides evaluation kit information. Graph tools are provided within each tab to allow you to control the cursor, zooming, and panning (see Figure 15) within the graphs displayed. 1 2 3 1. USED FOR CONTROLLING THE CURSOR, IF PRESENT. 2. USED FOR ZOOMING IN AND OUT. 3. USED FOR PANNING. Figure 15. Graph Tools Rev. 0 | Page 14 of 20 12304-015 • • EVAL-AD7405FMCZ User Guide UG-690 GENERATING A WAVEFORM ANALYSIS REPORT Figure 16 illustrates the tab used for waveform capture. Click Single Capture or Continuous Capture (labeled 1 in Figure 16) to capture a number of samples from the ADC and graph the resulting waveform. Graph controls (labeled 2 in Figure 16) are located above the graph and may be used pan and zoom into particular areas of the graph (see the Graph Tools section and Figure 15 for more information). The Waveform Analysis area (labeled 3 in Figure 16) shows statistics pertaining to the captured waveform such as maximum, minimum, and mean amplitudes and signal frequency. 1 2 12304-016 3 Figure 16. Waveform Capture Tab Rev. 0 | Page 15 of 20 UG-690 EVAL-AD7405FMCZ User Guide GENERATING A HISTOGRAM OF THE ADC CODE DISTRIBUTION DC Input The Histogram tab (see Figure 17) can be used to perform ac testing or, more commonly, dc testing. This tab shows the ADC code distribution of the input and computes the mean and standard deviation, which are displayed as DC Offset/Mean and Transition Noise, respectively, in the Histogram Analysis area (labeled 2 in Figure 17). To perform a histogram test of dc input, AC Input To perform a histogram test of ac input, 2. 3. Apply a quality signal source to the VIN+ input on the board. Select the Histogram tab in the evaluation software main window Click the Single Capture or Continuous Capture button (labeled 1 in Figure 17). 1. 2. Select the Histogram tab in the evaluation software main window. Click Single Capture or Continuous Capture (labeled 1 in Figure 17). Raw data is captured and passed to the PC for statistical computations, and various measured values are displayed in the Histogram Analysis area (labeled 2 in Figure 17). 1 2 12304-017 1. The histogram is more commonly used for dc testing. Figure 17. Histogram Capture Tab Rev. 0 | Page 16 of 20 EVAL-AD7405FMCZ User Guide UG-690 GENERATING A FAST FOURIER TRANSFORM OF AC CHARACTERISTICS Figure 18 shows the FFT tab. This feature tests the traditional ac characteristics of the converter and displays a fast Fourier transform (FFT) of the results. To perform an ac test, 2. 3. Apply a bipolar sinusoidal signal with low distortion (better than 115 dB) to the evaluation board at the VIN+ input. To attain the requisite low distortion, which is necessary to allow true evaluation of the part, one option is to filter the input signal from the ac source. Choose an appropriate band-pass filter based on the sinusoidal signal applied. Click the FFT tab from the main window. Click Single Capture or Continuous Capture. Figure 18 displays the spectral analysis results of the captured data. • • • The plot is the FFT image of the raw data. The FFT Analysis box displays the performance data: SNR, THD, SINAD, dynamic range, and noise performance along with the input signal characteristics (see label 1 in Figure 18). Clicking Show Harmonic Content (labeled 2 in Figure 18) displays the frequency and amplitude of the fundamental in addition to the second to fifth harmonics. 1 2 12304-018 1. As in the histogram test, raw data is then captured and passed to the PC, which performs the FFT and displays the resulting SNR, THD, and SINAD. Figure 18. FFT Capture Tab Rev. 0 | Page 17 of 20 UG-690 EVAL-AD7405FMCZ User Guide GENERATING A SUMMARY OF THE WAVEFORM, HISTOGRAM, AND FAST FOURIER TRANSFORM Figure 19 shows the Summary tab. This tab captures and displays all of the information in one window with a synopsis of the information, including key performance parameters, such as SNR and THD (see the SNR and THD boxes, labeled 1 and 2, respectively, in Figure 19). 1 12304-019 2 Figure 19. Summary Tab Rev. 0 | Page 18 of 20 EVAL-AD7405FMCZ User Guide UG-690 SAVING FILES PRINT SCREENSHOT The software can save the current captured data for future analysis. The software also has the ability to save or print a screenshot of the currently displayed window. To print a screenshot, from the File menu, select Print Screenshot. The screenshot is sent to the default printer. No dialog will appear when printing a screenshot. Saving Captured Data OPENING FILES To save data, from the File menu, select Save Captured Data, The Save As dialog box shown in Figure 20 opens. Save the file to an appropriate folder location. Waveform data is saved in .csv format and may be opened for further analysis in other software, such as Excel and MATLAB®. Loading Captured Data The software can load previously captured data for analysis. From the File menu, select Load Captured Data. Only data that was previously captured and saved can be opened. The raw data is used to rebuild the histogram and ac spectrum analyses upon being loaded into the evaluation platform. 12304-020 When Load Captured Data is selected, the Open file dialog box in Figure 22 opens for loading an appropriate file. The evaluation software expects that a previously generated waveform file is in .csv format. Figure 20. Dialog Box for Saving a File Saving Screenshot 12304-022 To save a screenshot, from the File menu, select Take Screenshot. The Select the JPEG file to write dialog box in Figure 20 opens. Save the file to an appropriate folder location. Screenshots are saved in .jpeg format and can be viewed with any picture viewer/editor. 12304-021 Figure 22. Dialog Box for Opening a File Figure 21. Dialog Box for Saving a Screenshot Rev. 0 | Page 19 of 20 UG-690 EVAL-AD7405FMCZ User Guide NOTES ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed. ©2014 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG12304-0-9/14(0) Rev. 0 | Page 20 of 20