EVAL-AD7768FMCZ

EVAL-AD7768FMCZ User Guide UG-917 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 Evaluation Board for the AD7768 24-Bit, 8-Channel, Simultaneous Sampling, 256 kSPS, Sigma-Delta ADC with Power Scaling FEATURES GENERAL DESCRIPTION Full featured evaluation board for the AD7768 PC control in conjunction with the SDP-H1 System Demonstration Platform (EVAL-SDP-CH1Z) PC software control and data analysis Time and frequency domain Standalone hardware capability The EVAL-AD7768FMCZ evaluation kit features the AD7768 24-bit, 256 kSPS, analog-to-digital converter (ADC). A 7 V to 9 V external bench top supply is regulated to 5 V and 3.3 V to supply the AD7768 and support components. The EVALAD7768FMCZ board connects to the USB port of the PC via a connection to the EVAL-SDP-CH1Z motherboard. ONLINE RESOURCES The AD7768 evaluation software fully configures the AD7768 device register functionality and provides dc and ac time domain analysis in the form of waveform graphs, histograms, and associated noise analysis for ADC performance evaluation. Evaluation Kit Contents EVAL-AD7768FMCZ evaluation board Evaluation software CD for the AD7768 Documents Needed AD7768 data sheet EVAL-AD7768FMCZ user guide Required Software AD7768 evaluation software EQUIPMENT NEEDED EVAL-AD7768FMCZ evaluation board EVAL-SDP-CH1Z System Demonstration Platform External 7 V to 9 V bench top power supply DC/AC signal source (Audio Precision or similar high performance signal source) USB cable PC running Windows with USB 2.0 port PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. The EVAL-AD7768FMCZ is an evaluation board that allows the user to evaluate the features of the ADC. The user PC software executable controls the AD7768 over a USB cable through the EVAL-SDP-CH1Z System Demonstration Platform (SDP). The AD7768 evaluation software requires PC running Windows® 7 to Windows 10 with a USB 2.0 port. Full specifications on the AD7768 are available in the product data sheet, which should be consulted in conjunction with this user guide when working with the evaluation board. Rev. A | Page 1 of 18 UG-917 EVAL-AD7768FMCZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Serial Data Interface ......................................................................8 Online Resources .............................................................................. 1 Serial Configuration Interface .....................................................8 Equipment Needed ........................................................................... 1 Powering Down the System Demonstration Platform ...............8 General Description ......................................................................... 1 Sockets/Connectors ......................................................................9 Revision History ............................................................................... 2 Evaluation Board Setup Procedures ...........................................9 EVAL-AD7768FMCZ Quick Start Guide...................................... 3 Evaluation Board Software ............................................................ 10 Analog Inputs and Front-End Circuit ........................................... 4 Software Installation Procedures.............................................. 10 Evaluation Board Hardware ............................................................ 5 Setting Up the System for Data Capture ................................. 13 Device Description ....................................................................... 5 Software Operation .................................................................... 14 Hardware Link Options ............................................................... 5 Power Supplies .............................................................................. 8 REVISION HISTORY 10/2017—Rev. 0 to Rev. A Change to General Description ...................................................... 1 Changes to Evaluation Board Software Section ......................... 10 Added Figure 3 and Figure 4; Renumbered Sequentially ......... 10 Changes to Figure 16 ...................................................................... 13 Changes to Figure 17 and Help Button Section, Added Sweep Button Section ................................................................................. 14 Changes to Waveform Tab Section and Figure 20 ..................... 15 Changes to FFT Tab Section, Histogram Tab Section, Figure 21 through Figure 24 ........................................................................... 16 Change to Example Section........................................................... 17 1/2016—Revision 0: Initial Version Rev. A | Page 2 of 18 EVAL-AD7768FMCZ User Guide UG-917 EVAL-AD7768FMCZ QUICK START GUIDE 4. To begin using the evaluation board, do the following: 2. 3. Ensure that the EVAL-SDP-CH1Z board is disconnected from the USB port of the PC. Install the evaluation board software from the CD included in the evaluation board kit. Restart the PC after the software installation is complete. (For complete software installation instructions, see the Software Installation Procedures section.) Connect the EVAL-SDP-CH1Z board to the EVALAD7768FMCZ board (unpowered). Figure 1 illustrates the connection: J4 of the EVAL-SDP-CH1Z board adapts to the receiving socket on the EVAL-AD7768FMCZ printed circuit board (PCB). Ensure that the boards are connected firmly together. APPLY 7V TO 9V BETWEEN VIN AND GND ON J3 CONNECTOR J1 BARREL CONNECTOR ADA4896-2 AMPLIFIERS GAIN = 1 5. 6. AD7768 24-BIT, 8-CHANNEL SAMPLING ADC ADR444 4.096V PRECISION REFERENCE CONNECTION TO SDP BOARD ANALOG INPUT CONNECTIONS SMB – AC INPUTS TERMINAL BLOCK DC INPUTS 14062-001 1. Apply power to the EVAL-AD7768FMCZ board via the supplied 9 V dc adapter at J1 (LK1 in Position B). Alternatively, supply an external voltage in the range of 7 V to 9 V from a bench top power supply using the J3 connector (LK1 in Position A). Connect the 12 V dc supply to the EVAL-SDP-CH1Z board, and then connect to the PC using the supplied USB cable. For Windows XP, the PC 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. Launch the AD7768 evaluation software from the Analog Devices subfolder in the Programs menu. Figure 1. EVAL-AD7768FMCZ Evaluation Board Rev. A | Page 3 of 18 UG-917 EVAL-AD7768FMCZ User Guide ANALOG INPUTS AND FRONT-END CIRCUIT As shown in Figure 1, the AIN0± to AIN7± analog inputs are accessible through either the SMBs or the terminal blocks. The ADR444 4.096 V low noise reference is used by default, allowing an absolute input range of 0||4.096 V on each input. Figure 2 shows theses connectors and details the 16 main solder links that route the inputs from either the terminal blocks or the SMBs for each of the signals. The ADA4896-2 amplifiers are not terminated at the inputs for any particular source impedances. In the default board configuration, the input terminals are connected through to the ADA4896-2 on each of the ADC channels. TERMINAL BLOCKS J8, J13 The on-board, common-mode voltage source on the AD7768 is used to bias the input signal. The default condition is VCM = (AVDD1 − AVSS)/2. SOLDER LINK TYPES TO ROUTE ANALOG INPUTS TO ADC INPUTS J8 CH5 CH4 8 × ADA4896-2 ADC DATA CH0 SOLDER LINKS: SL5 + 1, SL5 – 1 FOR CHANNEL 5 ONLY CH1 A CH2 J13 CH3 TO ADC INPUT VIA ADA4896-2, G = 1 B AD7768 SPI CONTROL ADR444 DIRECT TO ADC INPUT C NOTES 1. AD7768 EVALUATION BOARD ACCEPTS SIGNALS FROM 0V TO 5V ONLY (WITH DEFAULT SUPPLIES). Figure 2. Analog Inputs: Input Connectors, Solder Links, and Amplifiers Rev. A | Page 4 of 18 14062-002 CH6 SOLDER LINKS SL7+, SL7, SL6+, SL6–, SL4+, SL4–, SL3+, SL3–, SL2+, SL2–, SL1+, SL1– FOR CHANNEL 7,CHANNEL 6, CHANNEL 4, CHANNEL 3, CHANNEL 2, CHANNEL 1, CHANNEL 0 B DIRECT TO ADC INPUT CLOCK TO ADC INPUT VIA ADA4896-2, SURF BOARD A G = 1 (DEFAULT) (32MHz CLOCK) 120-PIN CONNECTOR TO SDP CH7 EVAL-AD7768FMCZ User Guide UG-917 EVALUATION BOARD HARDWARE DEVICE DESCRIPTION The AD7768 is an 8-channel, simultaneously sampling, Σ-Δ ADC. The AD7768 offers an ADC per channel and synchronized sampling. The ADC power scaling is as required for the application, catered for by selecting one of the following modes of operation: • • • Fast: 256 kSPS maximum, 110.8 kHz input bandwidth, 52 mW per channel Median: 128 kSPS maximum, 55.4 kHz input bandwidth, 28 mW per channel Economy: 32 kSPS maximum, 13.8 kHz input bandwidth, 9.5 mW per channel The AD7768 offers extensive digital filtering: • • Wideband: low ripple, non-aliasing, low pass filter with sharp roll off, and full attenuation at Nyquist frequency. Sinc response: sinc5 filter, low latency path for dc measurements or control loops. Within these filter options, the user can select a decimation rate of 32, 64, 128, 256, 512, or 1024. Embedded analog functionality on each ADC channel simplifies system design. A precharge buffer on each analog input reduces analog input current. Complete specifications for the AD7768 are provided in the product data sheet and should be consulted in conjunction with this user guide when using the evaluation board. Full details about the EVAL-SDP-CH1Z are available on the Analog Devices, Inc., website. HARDWARE LINK OPTIONS The default link options are listed in Table 1. The board can be configured to operate from a bench top power supply via Connector J3, or from a 9 V dc adapter via Connector J1. The supply required for the AD7768 comes from the on-board lowdropout regulators (LDOs), which generate their input voltage from J1 or J3 depending on the setting of LK1. Alternatively, the board can be powered by setting LK2 to Position A when used in conjunction with the EVAL-SDP-CH1Z (see Table 3 for details). Table 1. Default Link and Solder Link Options Link No. LK1 Default Option A LK2 B SL1 A SL2 B SL3 A SL4 A SL4A A SL5 SL6 Soldered 0 Ω Resistor A Description LK1 selects the input voltage source. Position A: J3 is selected Position B: J1 is selected LK2 selects the input from EVAL-SDP-CH1Z board. Position A: 12 V input from EVAL-SDP-CH1Z Position B: external power supply from either J1 or J3 SL1 selects between pin or SPI mode operation of the AD7768. Position A: SPI mode Position B: pin mode (pin mode is not compatible with the evaluation software and currently untested on evaluation board) Format 0 pin. Position A: IOVDD Position B: DGND Format 1 pin. Position A: DGND Position B: IOVDD Clock terminal source selection. To choose the Y1 crystal oscillator, do not populate SL4. R253, R254, C46, and C45 must be populated. SL4A must be configured to the crystal oscillator. Position A: selects CMOS Oscillator Y2 Position B: unpopulated terminals J6 and J7 Position C: SDP MCLK Clock select pin. CMOS clock option on Pin 32 Crystal oscillator or LVDS option Shorts SYNC_OUT to SYNCIN to allow sync pulses on START to be synchronously applied to SYNCIN. Pin 16: PD0/CS. Position A: CS chip select pin in SPI mode Position B: Channel 0 to Channel 3 power down (pin mode) Position C: Channel 0 to Channel 3 enabled (pin mode) Rev. A | Page 5 of 18 UG-917 EVAL-AD7768FMCZ User Guide Link No. SL7 Default Option A SL8 A SL9 A SL10 A SL11 A SL12 A SL13 A SL14 A SL15 A SL16 B SL17 B SL18 SL19 Unsoldered A SL22, SL23 Description Pin 17: PD1/SCLK. Position A: SCLK in SPI mode Position B: Channel 4 to Channel 7 power down (pin mode) Position C: Channel 4 to Channel 7 enabled (pin mode) Pin 18: DEC1/SDI. Position A: SDI in SPI mode Position B: IOVDD Position C: GND Pin 18: DEC0/SDO. Position A: SDO in SPI mode Position B: IOVDD Position C: GND Pin 12: MODE0/GPIO0. Position A: GPIO to SDP Position B: GND Position C: IOVDD Pin 13: MODE1/GPIO1. Position A: GPIO to SDP Position B: GND Position C: IOVDD Pin 14: MODE2/GPIO2. Position A: GPIO to SDP Position B: GND Position C: IOVDD Pin 15: MODE3/GPIO3. Position A: GPIO to SDP Position B: GND Position C: IOVDD Pin configuration mode. AD7768 evaluation kit software runs from SPI mode; select the filter via the register map. This link selects the filter mode (only available in pin mode). Position A: GPIO4 Position B: sinc5 fast settling filter Position C: wideband low-ripple filter Select common-mode voltage to bias input signals to one of the following. Position A: OP2177 buffered VCM output Position B: VCM output from AD7768 Select reference path from ADR444 to REFX+. Position A: bypass external reference buffer Position B: ADR444 input into ADA4841-1 reference buffer Select reference path from ADR444 to REFX+. Position A: bypass external reference buffer Position B: select output from ADA4841-1 reference buffer Shorts IOVDD to DREGCAP, only for IOVDD = 1.8 V operation; see the AD7768 data sheet. External common mode buffer input selection. Position A: AD7768 VCM pin Position B: AVDD1 used for common-mode selection, R166 (0 Ω) and R167 (not inserted) can be used as voltage dividers Selects the output from Channel 5 surf board option. Position A: ADA4896-2 Position B: bypass driver Position C: amplifier surf board header via the J11 and J12 connectors Rev. A | Page 6 of 18 EVAL-AD7768FMCZ User Guide Link No. SLP1 Default Option A SLP2 A SLP4 A SL_AMP+ A SL_AMP- A SL7+ to SL0+, SL7− to SL0− A SL5+, SL5− A UG-917 Description AVDD1 input selector. Position A: ADP7118ARDZ-5.0 5 V LDO Position B: external AVDD1 input, J2-3 AVDD2 LDO selector. Position A: ADP7118ARDZ-5.0 5 V LDO Position B: external AVDD2 input, J2-4 IOVDD input selector. Position A: ADP7118ARDZ-3.3 3.3 V LDO Position B: external AVDD2 input, J2-5, 2.25 V to 3.6 V, 1.8 V ADA4896-2 positive supply voltage. Position A: AVDD1 ADP7118ARDZ-5.0 5 V supply Position B: external supply to board, J1 or J3 input depending on LK1 position ADA4896-2 negative supply voltage. Position A: evaluation board ground plane Position B: external supply to board, J1 or J3 input depending on LK1 position, on-board ADA4896-2 are shorted to ground and VSS pins, replace with capacitors for bipolar amplifier supplies Selects the input driver for Channel 7, Channel 6, Channel 4, Channel 3, Channel 2, Channel 1, and Channel 0. Position A: ADA4896-2 Position B: bypass driver Selects the input driver for Channel 5. Position A: ADA4896-2 Position B: bypass driver Position C: amplifier surf board header via the J11 and J12 connectors On-Board Connectors Table 2 provides information about the external connectors on the EVAL-AD7768FMCZ. Table 2. On-Board Connectors Connector J1 J2 J3 J6 J7 J8,J9 J11 J12 J13, J14 J15 AI0+ to AI7+ AI0− to AI7− P1 Function Wall wart (dc plug) power supply voltage input. Apply 7 V to 9 V and GND (0 V) to this connector to power the evaluation board. Connector for supplying AVDD1, AVDD2, IOVDD, AVSS, and AGND externally. Bench top power supply voltage input. Apply 7 V to 9 V and GND (0 V) to this connector to power the evaluation board. SMA/SMB connector for XTAL2 (CLKIN/LVDS). SMA/SMB connector for XTAL1 (LVDS). 8-pin connector for input to Channel 4 to Channel 7. Optional external connector for driver daughter board. Channel 5. Optional external connector for driver daughter board. Channel 5. 8-pin connector for input to Channel 0 to Channel 3. Unpopulated VCM SMA connector. Analog input SMA positive terminal for Channel 0 to Channel 7. Analog input SMA negative terminal for Channel 0 to Channel 7. Connector on the underside of the EVAL-AD7768FMCZ board that mates with the EVAL-SDP-CH1Z controller board. Rev. A | Page 7 of 18 UG-917 EVAL-AD7768FMCZ User Guide POWER SUPPLIES SERIAL CONFIGURATION INTERFACE The evaluation board requires that an external power supply, either a bench top supply or a wall wart (dc plug) supply, be applied to J1 or J3 (see Table 3 for more information). Linear regulators generate the required power supply levels from the applied VIN rail. The regulators used are the 5 V ADP7118 (U1 and U7), which supply AVDD1, the on-board amplifiers and reference, and the 3.3 V ADP7118 (U16), which delivers 3.3 V to the IOVDD pin of the AD7768. The AD7768 is configured by the EVAL-SDP-CH1Z via a 4-wire SPI interface. SL1 must be shorted to Position A for this mode to be active. SERIAL DATA INTERFACE The AD7768 evaluation board outputs conversion results to the EVAL-SDP-CH1Z via the eight data output pins, DOUT0 to DOUT7. The serial data interface also includes signals such as SCLK, DCLK, and RDY (all are outputs). POWERING DOWN THE SYSTEM DEMONSTRATION PLATFORM When disconnecting the SDP-H1 evaluation platform and powering down the system, make sure to first exit the evaluation software. Then, press the reset button on the EVAL-SDP-CH1Z board before disconnecting the 12 V supply and then the USB. Failure to follow this procedure can cause damage to the EVALSDP-CH1Z board. Table 3. AD7768 Power Supply 1 Power Supply (VIN) From J1 Voltage Range 7 V to 9 V J3 7 V to 9 V EVAL-SDP-CH1Z 12 V 1 Function Wall wart (dc plug) supply to the evaluation board. Supplies LDOs that create 5 V, and 3.3 V rails. It also supplies the ADR444 external reference. Ensure that both LK1 and LK2 are set to Position B when the external power supply is applied to this connector. Bench top supply to the evaluation board. Supplies LDOs that create 5 V and 3.3 V rails. It also supplies the ADR444 external reference and on-board amplifiers. Ensure that LK1 is set to Position A when the external power supply is applied to this connector and LK2 is set to Position B. If using the EVAL-SDP-CH1Z, power can be taken from this board and supplied to the LDOs. Set LK2 to Position A. Only a single supply is required. Rev. A | Page 8 of 18 EVAL-AD7768FMCZ User Guide UG-917 SOCKETS/CONNECTORS Table 4. Connector Details Connector J1 J6 Function Wall wart (dc plug) power supply voltage input. Apply 7 V. Apply voltage within data sheet specified ranges and GND (0 V) to this connector to power the evaluation board. J2 is the connector for supplying AVDD1, AVDD2, IOVDD, AVSS, and AGND externally. Bench top power supply voltage input. Apply 7 V to 9 V and GND (0 V) to this connector to power the evaluation board. SMA/SMB connector for XTAL2 (CLKIN/LVDS). J7 SMA/SMB connector for XTAL1 (LVDS). J8, J9 8-pin connector for input to Channel 4 to Channel 7. Optional external connector for driver daughter board. Channel 5. Optional external connector for driver daughter board. Channel 5. 8-pin connector for input to Channel 0 to Channel 3. Unpopulated VCM SMA connector. J2 J3 J11 J12 J13, J14 J15 AI0+ to AI7+ AI0− to AI7− P1 Analog input SMA positive terminal for Channel 0 to Channel 7. Analog input SMA negative terminal for Channel 0 to Channel 7. Connection to EVAL-SDP-CH1Z controller board. Connector Type 2 mm dc power connector 5-pin socket terminal block Manufacturer/Part No. Kycon KLDX-SMT2-0202-A 3-pin socket terminal block, 3.81 mm pitch Phoenix Contact MC 1,5/3-G-3,81 Farnell 3704737 Straight PCB mount SMB/SMA jack Straight PCB mount SMB/SMA jack 8-pin socket terminal block, 3.81 mm pitch 7-way, 2.54 mm vertical socket 7-way, 2.54 mm TH header 8-pin socket terminal block, 3.81 mm pitch Straight PCB mount SMB/SMA jack Straight PCB mount SMB/SMA jack Straight PCB mount SMB/SMA jack 160-pin, 10 mm male VITA 57 connector Tyco 1-1337482-0 Not inserted Tyco 1-1337482-0 Not inserted Phoenix Contact MC 1,5/8-G-3,81 Samtec SSW-107-01-T-S Farnell 3704774 Farnell 1803478 Samtec TLW-107-05-G-S Farnell 1668499 Phoenix Contact MC 1,5/8-G-3,81 Tyco 1-1337482-0 Farnell 3704774 Tyco 1-1337482-0 Farnell 1206013 Tyco 1-1337482-0 Farnell 1206013 Samtec ASP-134604-01 Farnell 2433507 Lumberg FRE 05 Order No. Mouser 806-KLDXSMT20202A Farnell 1217310 Farnell 3704737 EVALUATION BOARD SETUP PROCEDURES Configuring the Evaluation and SDP Boards After following the instructions in the Software Installation Procedures section, set up the evaluation and SDP boards as detailed in this section. Connect the EVAL-SDP-CH1Z board to P1 (bottom) on the EVAL-AD7768FMCZ board. 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. Rev. A | Page 9 of 18 UG-917 EVAL-AD7768FMCZ User Guide EVALUATION BOARD SOFTWARE SOFTWARE INSTALLATION PROCEDURES c) The EVAL-AD7768FMCZ evaluation kit includes a CD containing software to be installed on the PC before using the evaluation board. There are two parts to the installation: • • After selecting the checkbox and clicking OK the dialog box in Figure 4 appears. Please note a valid internet connection is needed for this step. Select the Download filed from Windows Update option and after installation the EVAL-AD7768FMCZ will operate as expected. AD7768 evaluation board software installation EVAL-SDP-CH1Z system demonstration platform board drivers installation Warning 14062-104 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. When disconnecting the board, it is important to follow the power down sequence outlined in the Powering Down the System Demonstration Platform section. Installing the Evaluation Board Software To install the evaluation board software, Figure 4. Prompt to Download Windows Update 2. 3. 4. With the EVAL-SDP-CH1Z board disconnected from the USB port of the PC, insert the installation CD into the CD-ROM drive. Double-click the setup.exe file to begin the evaluation board software installation. The software is installed to the following default location: C:\Program Files\Analog Devices\AD7768. A dialog box appears requesting permission to allow the program to make changes to the PC. Click Yes. 14062-003 The EVAL-AD7768FMCZ evaluation software requires the .NET 3.5 framework in order to operate correctly. Ensure that the correct .NET framework is installed before continuing with the installation. This can be checked by doing the following: a) In the Windows Control Panel select Programs and then Programs and Features. b) Select the Turn Windows Features on or off section. This will list the features currently installed. In this list change that the .NET framework 3.5 (includes .NET 2.0 and 3.0) has been selected. Figure 3 below shows the dialog box as it appears in Windows 10. Figure 5. Evaluation Board Software Installation: Granting Permission for Program to Make Changes 14062-103 1. Figure 3. Turning Windows Features On and Off Rev. A | Page 10 of 18 EVAL-AD7768FMCZ User Guide Select the location to install the software, and then click Next. Figure 6 shows the default installation locations, which are displayed when the window opens. To select a different installation location, click Browse. 7. A summary of the installation is displayed. Click Next to continue. 14062-006 5. UG-917 14062-004 Figure 8. Evaluation Board Software Installation: Reviewing a Summary of the Installation Figure 6. Evaluation Board Software Installation: Selecting the Location for Software Installation A dialog box informs you when the installation is complete. Click Next. 14062-007 A license agreement appears. Read the agreement, select I accept the License Agreement, and then click Next. 14062-005 6. 8. Figure 7. Evaluation Board Software Installation: Accepting the License Agreement Rev. A | Page 11 of 18 Figure 9. Evaluation Board Software Installation: Indicating When the Installation is Complete UG-917 EVAL-AD7768FMCZ User Guide Installing the System Demonstration Platform Board Drivers 3. Click Install to confirm that you want to install the drivers. After the installation of the evaluation software is complete, a welcome window displays for the installation of the SDP drivers. With the EVAL-SDP-CH1Z board still disconnected from the USB port of the PC, make sure that all other applications are closed, and then click Next. 14062-010 1. Figure 12. SDP Drivers Setup: Granting Permission to Install Drivers To complete the drivers installation, click Finish, which closes the installation wizard. 14062-008 4. Figure 10. SDP Drivers Setup: Beginning the Drivers Installation Select the location to install the drivers, and then click Next. 14062-011 2. Figure 13. SDP Drivers Setup: Completing the Drivers Setup Wizard Figure 11. SDP Drivers Setup: Selecting the Location for Drivers Installation Rev. A | Page 12 of 18 Before using the evaluation board, you must restart your computer. 14062-012 14062-009 5. Figure 14. SDP Drivers Setup: Restarting the Computer EVAL-AD7768FMCZ User Guide UG-917 SETTING UP THE SYSTEM FOR DATA CAPTURE Launching the Software After completing the steps in the Software Installation Procedures and Evaluation Board Hardware sections, set up the system for data capture as follows: After completing the steps in the Setting Up the System for Data Capture section, launch the AD7768 software as follows: 2. From the Start menu, click Programs > Analog Devices > AD7768 Evaluation Software. The main window of the software then displays. If the AD7768 evaluation system is not connected to the USB port via the EVAL-SDP-CH1Z when the software is launched, a connectivity error displays prompting the user to choose an evaluation board (see Figure 16). Connect the evaluation board to the USB port of the PC, wait a few seconds, click Rescan, and then follow the on-screen instructions. 14062-014 2. Allow the Found New Hardware Wizard to run after the EVAL-SDP-CH1Z board is plugged into the PC. (If using Windows XP, the PC may need to search for the SDP drivers. Choose to automatically search for the drivers for the SDP board if prompted by the operating system.) Check that the board is connecting 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 the computer. Click Yes. iii. The Computer Management box appears. Click Device Manager from the list of System Tools (see Figure 15). b. The EVAL-SDP-CH1Z board appears under ADI Development Tools, which indicates that the driver software is installed and that the board is connected to the PC correctly. Figure 16. Connectivity Error Alert When the software starts running, it searches for hardware connected to the PC. A dialog box indicates when the SDP board connected to the PC is detected, and then the main window appears (see Figure 17). 14062-013 1. 1. Figure 15. Device Manager: Checking That the Board Is Connected to the PC Correctly Rev. A | Page 13 of 18 UG-917 EVAL-AD7768FMCZ User Guide SOFTWARE OPERATION 2 2 1 7 4 4 5 14062-015 6 Figure 17. Evaluation Software Main Window Overview of the Main Window The main window contains the significant control buttons and analysis indicators of the evaluation software. Configuration Tab and AD7768 Block Diagram The Configuration tab is the tab displayed by default when the software first opens. An overview of the AD7768 block diagram is shown, along with buttons that open pop-up menus for quick configuration of the device. The Waveform tab displays captured waveform data. It also contains options to save the resulting data and shows the outputted header data from the conversion results. from the sweep operation is saved and can be viewed from the .csv file. Number of Samples (3) The number of samples per channel is variable and can be changed using the Samples control. MCLK (4) The MCLK (Hz) control in the Configuration tab must match the frequency of the ADC clock source. VREF (5) The FFT and Histogram tabs show a more in depth analysis of the outputted data. This data can be saved to a file. Use the Registers tab to change the configuration of the AD7768. Sample Button (1) Click Sample to start ADC sampling; results are reported in the Waveform, FFT, and Histogram tabs. The mode of operation can be set using the Sampling Mode button; the mode can be continuous sampling or a single run. The Ext. REF (V) in the Configuration tab control must match the reference voltage of the ADC. ADC Reset (6) Clicking ADC Reset in the Configuration tab sends a reset command to the ADC via the SPI, and resets the device to its default configuration. Help Button (7) The help button is located in the top right corner of the Configuration tab (see Figure 17). Click the help button to show information about the AD7768 software. Sweep Button (2) Click the Sweep button to open the dialog box to choose where to save the sweep data. Once the file name is written, the software will start sampling at a different decimation rate on each filter type for channel mode A. The results are reported in the Waveform, FFT, and Histogram tabs. The data gathered Rev. A | Page 14 of 18 EVAL-AD7768FMCZ User Guide UG-917 Header Data Status Indicator and Busy light The Header Data area shows the header data output in the first eight bits of a conversion. It conveys status information and the channel number. Header data for each channel can be selected by changing the Analysis Ch option. The status bar at the bottom of the screen indicates the current state of the AD7768 software. The Busy LED illuminates when the software is busy performing an action. Refrain from carrying out any more actions when this light is lit. • Waveform Tab • • • CRC Error indicates that an error has occurred, and a reset is required. Filter not settled indicates that the filter had not settled before data was sampled. Filter Type indicates the type of filter that has been selected. Filter saturated indicates that filter saturation has occurred. The Waveform tab displays a time-domain graph of the sampled data. Controls beneath the graph allow zooming and panning. Amplitude information is given beneath the graph for the analysis channel selected. The data displayed in the graph is in a direct binary format converted from a twos compliment ADC output. Note that the evaluation software has not been configured to output the CRC check code. 8 14062-016 14062-018 9 Figure 20. Waveform Tab Display Units (8) Figure 18. Example Header Data Channel Enable/Disable Check Box The channel enable and disable check boxes, as shown in Figure 19, individually enable channels for display and analysis. The Display Units dropdown menu selects the unit of the code displayed on the y-axis of the waveform graph; either decimal, hexadecimal, or the voltage equivalent of the code. Captured Data Button (9) 14062-017 Click the Captured Data button to open the dialog box to choose where to save the latest captured data. The Captured Data button saves only the latest codes after the Sample button is clicked. Figure 19. Channel Enable/Disable Check Boxes Rev. A | Page 15 of 18 UG-917 EVAL-AD7768FMCZ User Guide FFT Tab selected from the register map, located on the left hand side of the Registers tab. Individual register bits can be changed from the register section, or the entire register can also be written to by writing the required hexadecimal value. Drop-down options can be selected from the Bitfields section, or the entire bitfield can be written to with a hexadecimal value. The FFT tab shows a frequency-domain graph of the sampled data. Controls beneath the graph allow zooming and panning, and control over amplitude and frequency scaling. Frequency and amplitude information is given beneath the graph for the selected analysis channel. 14062-019 A particular register configuration can be saved to be loaded again at a later time. 10 14062-021 Figure 21. FFT Tab Save Data Button (10 and 11) Figure 23. Registers Tab Click the Save Data button to open a dialog box to save the histogram and FFT analysis data for the current sample. The data can also be saved by right clicking on the graph and choosing Export from the dropdown menu. Precharge Buffers: Register Operation Histogram Tab The Histogram tab shows a histogram of the sampled data. Controls beneath the graph allow zooming and panning, and control over amplitude scaling. Amplitude information is given beneath the graph for the selected analysis channel. The precharge buffers operate differently to the other registers. To change these registers, it is recommended to navigate to the Registers tab, select Precharge Buffer 1 or Precharge Buffer 2 from the register map, and change the value of these registers using the hexadecimal value located on the right hand side of the Register section (see Figure 24). The software reads back the status of the registers correctly; however, to change a bit to 0, for example, a 1 must be written to the given bit in the register. See the AD7768 data sheet for more details. 14062-020 14062-022 11 Figure 24. Enabling/Disabling the Precharge Buffers Figure 22. Histogram Tab Registers Tab Exiting the Software The Registers tab allows precise control of the AD7768 registers, allowing them to be read back and written to. The registers are grouped together and can be altered in a number of ways, as shown in Figure 23. The register to be written to can be To exit the software, click the red X at the top right hand corner of the main window. Be sure to press the reset button before the EVAL-SDP-CH1Z is powered off. Rev. A | Page 16 of 18 EVAL-AD7768FMCZ User Guide UG-917 Example 6. In this example, a sample is taken and analyzed with the help of the AD7768 software. The desired data is expected on Channel 2 of the ADC. 1. 2. 3. 4. 5. Start the AD7768 software. Wait for the Busy indicator to turn off. Ensure that MCLK (Hz) and Ext. REF (V) are set to match the clock frequency and reference voltage supplied to the chip (by default, 32 MHz and 4.096 V). Set the number of samples per channel to 32,768 (default). Configure the registers as required using the pop-up menus under the Configuration tab. Click Sample to take a reading. Wait for the Busy indicator to turn off. 7. 8. 9. Rev. A | Page 17 of 18 The sampled data is now present in the data capture tabs (Waveform, FFT, and Histogram tabs). Change between each of these to view the results. In this case, be sure to select Channel 2 on the channel enable and disable check boxes to view the desired data. Change various settings and observe the output. For example, set the number of samples per channel to 16,384. Click Sample to take a reading. Wait for the Busy indicator to turn off. The sampled data is now present in the Waveform, FFT, and Histogram tabs. UG-917 EVAL-AD7768FMCZ 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. 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