WIXLIB

EVAL-AD7124-4SDZ User GuideUG-855POWER SUPPLIESSERIAL INTERFACEThe evaluation board requires that an external power supply—either a bench top supply or a wall wart (dc plug) supply—beapplied to J3 or J5 (see Table 3 for more information). Linearregulators generate the required power supply levels from theapplied VIN rail. The regulators used are the ADP1720-3.3 (U7)and the ADP1720 (U4), which supply 3.3 V and 1.8 V,respectively, to AVDD of the ADC. The 3.3 V ADP1720 (U10)delivers 3.3 V to the IOVDD pin of the AD7124-4.The EVAL-AD7124-4SDZ evaluation board connects via theserial peripheral interface (SPI) to the Blackfin ADSP-BF527on the EVAL-SDP-CB1Z. There are four primary signals: CS,SCLK, DIN, and DOUT/RDY (all are inputs, except forDOUT/RDY, which is an output).When a split power supply is used, the AVSS voltage must beapplied from an external source via Connector J9. AVDD andIOVDD can also be provided via Connector J9. However, the 7 Vto 9 V supply is still required because the on-board reference(ADR4525) is supplied from this power supply.Each supply is decoupled at the point where it enters the boardand again at the point where it connects to each device (see theschematics shown in Figure 26 to Figure 29 to identifydecoupling points).To operate the EVAL-AD7124-4SDZ in standalone mode, theAD7124-4 serial interface lines can be disconnected from the120-pin header by removing the 0 Ω links, R9 through R13. Thetest points can then be used to fly-wire the signals to an alternativedigital capture setup.ANALOG INPUTSThe EVAL-AD7124-4SDZ primary analog inputs can be appliedin two ways: Using J6 and J11, the green screw in terminal connectorsUsing the A0 and A1 SMB/SMA footprints on theevaluation board, which connect to the AIN4 and AIN5analog inputs.The AD7124-4 EVAL Software is set up to analyze dc inputs tothe ADC.Table 3. Required External Power Supply1Power Supply(VIN) Applied ToJ3Voltage Range7 V to 9 VJ57 V to 9 V1FunctionBench top supply to the evaluation board. Supplies LDOs that create the 3.3 V and 1.8 V rails. It alsosupplies the ADR4525 external reference. Ensure that LK2 is set to Position A when the externalpower supply is applied to this connector.Wall wart (dc plug) supply to the evaluation board. Supplies LDOs that create the 3.3 V and 1.8 V rails.It also supplies the ADR4525 external reference. Ensure that LK2 is set to Position B when the externalpower supply is applied to this connector.Only a single supply is required, either J3 or J5. This supply can be selected using LK2.Rev. 0 Page 7 of 29

UG-855EVAL-AD7124-4SDZ User GuideREFERENCE OPTIONSEVALUATION BOARD SETUP PROCEDURESThe EVAL-AD7124-4SDZ includes an external 2.5 V reference(the ADR4525) and an internal 2.5 V reference. The defaultoperation is to use the external reference input, which is set toaccept the 2.5 V ADR4525 on the evaluation board.After following the instructions in the Software InstallationProcedures section, set up the evaluation and SDP boards asdetailed in this section.The reference used for a conversion is selected by choosing thereference in the configuration registers associated with Setup 0to Setup 7. Switch between using the internal reference andexternal reference by accessing the AD7124-4 registers throughthe pop-up windows (discussed in more detail in the followingsections) via the evaluation software. Figure 3 shows how toselect the reference source for Setup 0 to Setup 7. Figure 4shows the ADC CONTROL register setting that enables theinternal reference.The evaluation software and drivers must be installed beforeconnecting the evaluation board and EVAL-SDP-CB1Z board tothe USB port of the PC to ensure that the evaluation system iscorrectly recognized when it is connected to the PC.WarningConfiguring the Evaluation and SDP Boards1.13304-0032.3.13304-004Figure 3. Selecting the Reference SourceFigure 4. Enabling the Internal 2.5 V ReferenceRev. 0 Page 8 of 29Connect the EVAL-SDP-CB1Z board to Connector A orConnector B on the EVAL-AD7124-4SDZ board. Screwthe two boards together using the plastic screw and washerset included in the evaluation board kit to ensure that theboards are connected firmly together.Connect the power supplies to the EVAL-AD7124-4SDZboard. The EVAL-AD7124-4SDZ board, by default, usesthe wall wart (dc plug) supply that accompanies theevaluation kit. Connect this supply to J5 on the EVALAD7124-4SDZ board. (For more information about therequired connections and available options, see the PowerSupplies section.)Connect the EVAL-SDP-CB1Z board to the PC using thesupplied USB cable.

EVAL-AD7124-4SDZ User GuideUG-855EVALUATION BOARD SOFTWARE4.SOFTWARE INSTALLATION PROCEDURESThe EVAL-AD7124-4SDZ evaluation kit includes a CD containingsoftware to be installed on the PC before using the evaluationboard.Select the location to install the software, and then clickNext. (Figure 6 shows the default locations, which aredisplayed when the window opens; you can select anotherlocation by clicking Browse.)There are two procedures in the installation: AD7124-4 EVAL Software installationEVAL-SDP-CB1Z SDP board drivers installationWarningThe evaluation software and drivers must be installed beforeconnecting the evaluation board and EVAL-SDP-CB1Z board tothe USB port of the PC to ensure that the evaluation system iscorrectly recognized when it is connected to the PC.Installing the AD7124-4 EVAL Software3.Figure 6. AD7124-4 EVAL Software Installation:Selecting the Location for Software Installation5.A license agreement appears. Read the agreement, select Iaccept the License Agreement, and click Next.Figure 5. AD7124-4 EVAL Software Installation:Granting Permission for the Program to Make Changes to Your PC13304-0072.With the EVAL-SDP-CB1Z board disconnected from theUSB port of the PC, insert the installation CD into the CDROM drive.Double-click the setup.exe file to begin the evaluation boardsoftware installation. The software installs to the followingdefault location: C:\Program Files\Analog Devices\AD7124 EVAL .A dialog box appears asking for permission to allow theprogram to make changes to your PC. Click Yes.13304-0051.13304-006To install the AD7124-4 EVAL Software, do the following:Figure 7. AD7124-4 EVAL Software Installation:Accepting the License AgreementRev. 0 Page 9 of 29

UG-8556.EVAL-AD7124-4SDZ User GuideInstalling the EVAL-SDP-CB1Z System DemonstrationPlatform Board DriversA summary of the installation displays. Click Next tocontinue.After the installation of the evaluation software is complete, awelcome window displays for the installation of the SDP boarddrivers.With the EVAL-SDP-CB1Z board still disconnected fromthe USB port of the PC, make sure that all otherapplications are closed, and then click Next.13304-0081.Figure 8. AD7124-4 EVAL Software Installation:Reviewing a Summary of the Installation13304-010The message in Figure 9 appears when the installation iscomplete. Click Next.Figure 10. EVAL-SDP-CB1Z Drivers Setup:Beginning the Drivers Installation2.Select the location to install the drivers, and then clickNext.13304-009Figure 9. AD7124-4 EVAL Software Installation:Indicating When the Installation Is Complete13304-0117.Figure 11. EVAL-SDP-CB1Z Drivers Setup:Selecting the Location for Drivers InstallationRev. 0 Page 10 of 29

EVAL-AD7124-4SDZ User Guide3.UG-855Click Install to confirm that you want to install the drivers.Setting Up the System for Data CaptureAfter completing the steps in the Software InstallationProcedures and Evaluation Board Hardware sections, set up thesystem for data capture as follows:13304-0121.2.To complete the drivers installation, click Finish, whichcloses the setup wizard.3.13304-0134.Figure 12. EVAL-SDP-CB1Z Drivers Setup:Granting Permission to Install DriversAllow the Found New Hardware Wizard to run after theEVAL-SDP-CB1Z board is plugged into your PC. (If youare using Windows XP, you may need to search for theEVAL-SDP-CB1Z drivers. Choose to automatically searchfor the drivers for the EVAL-SDP-CB1Z board if promptedby the operating system.)Check that the board is connecting to the PC correctlyusing the Device Manager of the PC.Access the Device Manager as follows:a. Right-click My Computer and then click Manage.b. A dialog box appears asking for permission to allowthe program to make changes to your PC. Click Yes.c. The Computer Management window appears. Fromthe list of System Tools, click Device Manager (seeFigure 15).d. The EVAL-SDP-CB1Z board should appear underADI Development Tools, which indicates that thedriver software is installed and that the board isconnecting to the PC correctly.Before using the evaluation board, you must restart the PC.Figure 15. Device Manager:Checking that the Board Is Connected to the PC Correctly13304-0145.13304-015Figure 13. EVAL-SDP-CB1Z Drivers Setup:Completing the Drivers Setup WizardFigure 14. EVAL-SDP-CB1Z Drivers Setup:Restarting the PCRev. 0 Page 11 of 29

UG-855EVAL-AD7124-4SDZ User GuideLaunching the SoftwareSOFTWARE OPERATIONAfter completing the steps in the Setting Up the System for DataCapture section, launch the AD7124-4 EVAL Software asfollows:Overview of the Main Window2.From the Start menu, click Programs Analog Devices AD7124 Eval AD7124 Eval . The dialog box inFigure 19 appears; select EVAL-AD7124-4SDZ, and themain window of the software then displays as shown inFigure 20.If the AD7124-4 evaluation system is not connected to theUSB port via the EVAL-SDP-CB1Z when the software islaunched, a connectivity error displays (see Figure 16).Connect the evaluation board to the USB port of the PC,wait a few seconds, click Rescan, and then follow the onscreen instructions.13304-0191.The evaluation software supports both the AD7124-4 and theAD7124-8 devices. On running the software, the user selects theevaluation board that is connected to the PC. For the AD7124-4,select EVAL-AD7124-4SDZ from the drop-down list, as shownin Figure 19.13304-016Figure 19. EVAL-AD7124-4SDZ Evaluation Board SelectionFigure 16. Connectivity Error AlertAfter selecting the EVAL-AD7124-4SDZ evaluation board, themain window of the evaluation software displays, as shown inFigure 20. Figure 20 shows the significant control buttons andanalysis indicators of the AD7124-4 EVAL Software. The mainwindow of the AD7124-4 EVAL Software contains four tabs: When the software starts running, it searches for hardwareconnected to the PC. A dialog box indicates when the genericSDP attached to the PC is detected, and then the main windowappears (see Figure 20). Press the RESET button on the SDPboard, as shown in Figure 17.ConfigurationWaveformHistogramRegister MapCONFIGURATION TABThe Configuration tab shows a block diagram of the AD7124-4.It allows the user to set up the ADC, reset the ADC, read thediagnostics to see errors present, as well as configure the devicefor different demo modes. Figure 20 shows the Configurationtab in more detail, and the following sections discuss the differentelements on the Configuration tab of the software window.ADC Reset13304-017Click ADC RESET (Label 2) to perform a software reset of theAD7124-4. There is no hardware reset pin on the AD7124-4. Ahard reset can be performed by removing power to the board.The software reset has the same effect as a hard reset.Selecting External ReferenceFigure 17. SDP Connectivity Board—RESET Button13304-018Pressing the RESET button causes the software to rescan for aconnected SDP board. If found, the message shown in Figure 18displays.Figure 18. Connectivity when SDP and Evaluation Boards are FoundThere are a number of different options that can be used whenselecting the reference to the AD7124-4. Two options are AVddand Refin1( /-) (Label 3). The Refin1( /-). field sets theexternal reference voltage that is connected between REFIN1( )and REFIN1( ). Using the EVAL-AD7124-4SDZ evaluationboard, the AVDD voltage is 3.3 V. Either of these can be used incalculating the results on the Waveform and Histogram tabs.The evaluation board has an external 2.5 V ADR4525 reference,which can be bypassed; if bypassing the ADR4525 on board, besure to change the external reference voltage value in Refin1( /-)to ensure correct calculation of results in the Waveform andHistogram tabs.Rev. 0 Page 12 of 29

EVAL-AD7124-4SDZ User GuideUG-855Tutorial ButtonCONFIG SUMMARYClicking TUTORIAL (Label 4) opens a tutorial on using thesoftware, which provides additional information on using theAD7124-4 EVAL Software.Clicking CONFIG SUMMARY (Label 7) displays the channelconfiguration, information on the individual setups, as well asinformation on any error present. These tabs can be used toquickly check how the ADC channels are configured, as well asany errors that are present.Functional Block DiagramThe functional block diagram of the ADC (Label 5) shows eachof the functional blocks within the ADC. Clicking a configurationbutton on this graph opens the configuration popup window forthat block.Configuration Pop-Up ButtonEach configuration pop-up button (Label 6) opens a differentwindow allowing configuration of the relevant functional block.Demo ModesThe AD7124-4 EVAL Software supports a number of demomodes (Label 8); these demo modes configure the AD7124-4 foreach of the modes shown. A help file is available for each demomode; to access this help file, click the question mark button.Status BarThe status bar (Label 9) displays status updates such as AnalysisCompleted, Reset Completed, and Configuring Demo Modeduring software use, as well as the software version and theBusy indicator.12334756813304-0209Figure 20. Configuration Tab of the AD7124-4 EVAL SoftwareRev. 0 Page 13 of 29

UG-855EVAL-AD7124-4SDZ User GuideWAVEFROM TABChannel SelectionThe Waveform tab graphs the conversions and processes thedata, calculating the p-p noise, rms noise, and resolution (seeFigure 21).The channel selection control (Label 7) chooses which channelsdisplay on the data waveform, and also shows the analog inputsfor the channel labeled next to the on and off controls. Thesecontrols only affect the display of the channels and have noeffect on the channel settings in the ADC register map.Waveform Graph and ControlsThe data waveform graph (Label 1) shows each successivesample of the ADC output. Zoom in on the data using thecontrol toolbar (Label 2) in the graph. Change the scales on thegraph by typing values into the x-axis and y-axis.Analysis ChannelThe Noise Analysis section and histogram graph show theanalysis of the channel selected via the Analysis Channelcontrol (Label 3).SamplesThe Samples numeric control (Label 4) and batch control(Label 5) set the number of samples gathered per batch andwhether a single batch or multiple batches of samples aregathered. This control is unrelated to the ADC mode. The usercan capture a defined sample set or continuously gather batchesof samples. In both cases, the number of samples set in theSamples numeric input dictates the number of samples.SampleClick SAMPLE (Label 6) to start gathering ADC results. Resultsappear in the waveform graph (Label 1).Display Units and Axis ControlsClick the Display Units drop-down list (Label 8) to select whetherthe data graph displays in units of voltages or codes. This controlaffects both the waveform graph and the histogram graph. Theaxis controls can be switched between dynamic and fixed. Whendynamic is selected, the axis automatically adjusts to show theentire range of the ADC results after each batch of sample. Whenfixed is selected, the user can program the axis ranges; the axisranges do not automatically adjust after each batch of sample.CRC Error and Overall ErrorThe CRC Error LED indicator (Label 9) illuminates whena cyclic redundancy check (CRC) error is detected in thecommunications between the software and the AD7124-4. TheCRC functionality on the AD7124-4 is disabled by default andmust be enabled for this indicator to work. The Error PresentLED indicates if an overall error is present in the diagnosticsregister. For this indicator to work, the check for the differentdiagnostic errors must be enabled in the Error EN register.Noise AnalysisThe Noise Analysis section (Label 10) displays the results of thenoise analysis for the selected analysis channel, which includesboth noise and resolution measurements.Rev. 0 Page 14 of 29

EVAL-AD7124-4SDZ User GuideUG-855456713210813304-0219Figure 21. Waveform Tab of the AD7124-4 EVAL SoftwareRev. 0 Page 15 of 29

UG-855EVAL-AD7124-4SDZ User GuideHISTOGRAM TABDisplay Units and Axis ControlsThe Histogram tab generates a histogram using the gatheredsamples and processes the data, calculating the peak-to-peaknoise, rms noise, and resolution (see Figure 22).The data histogram graph (Label 1) shows the number of timeseach sample of the ADC output occurs. Zoom in on the datausing the control toolbar (Label 6) in the graph. Change thescales on the graph by typing values into the x-axis and y-axis.Click the Display Units drop-down list (Label 4) to selectwhether the data graph displays in units of voltages or codes.This c

EVAL-AD7124-4SDZ User Guide UG-855 . see the Software Installation Procedures section.) 2. Connect the EVAL-SDP-CB1Z board to the EVAL-AD7124-4SDZ board. 3. Screw the two boards together using the plastic screw and . This connector can be used to connect a load cell to the : AD7124-4. J12 . 6-pin connector. Provides an I. 2.