EVAL-AD7193EBZ

Evaluation Board User Guide UG-223 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 AD7193, 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta (Σ-Δ) ADC FEATURES GENERAL DESCRIPTION Full-featured evaluation board for the AD7193 PC software for the control of the AD7193 using a USB interface Various linking options The AD7193 evaluation kit is a powerful tool for exploring and evaluating the AD7193 features. When the board is connected to (and possibly powered from) a PC via a standard USB interface, the PC software allows for • INTRODUCTION • This user guide describes the EVAL-AD7193EBZ evaluation board. The AD7193 is a 4.8 kHz, ultralow noise, 24-bit Σ-Δ ADC. The AD7193 is a complete analog front end for low frequency measurement applications. It contains four differential inputs/ 8 pseudo differential inputs and includes a low noise instrumentation amplifier, reference detect, and a low side power switch. The graphical display of real-time data and logs this data into a text file. The modification of the internal settings of the AD7193. This software also helps in understanding the part features and performance. Finally, the flexible interface structure of the board allows it to be connected in a number of useful configurations. For example, the digital section of the evaluation board can be used independently as a convenient digital interface for a user’s own sensor design printed circuit board (PCB) or module containing the AD7193. Alternatively, an external microcontroller can be interfaced to the AD7193, and the evaluation board can act as a complete analog front end for creating and debugging software on the digital platform of the user. Full data on the AD7193 is available in the AD7193 data sheet available from Analog Devices, Inc., and should be consulted in conjunction with this user guide when using the evaluation board. AD7193 EVALUATION BOARD EXT VOLTAGE REGULATOR NOISE TEST CIRCUITRY SPI/USB INTERFACE AD7193 VOLTAGE REFERENCE REFIN Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 20 PC AND LabVIEW™ BASED SOFTWARE 09552-001 ANALOG INPUTS UG-223 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1  Evaluation Software Installation .................................................4  Introduction ...................................................................................... 1  Evaluation Board Installation ......................................................4  General Description ......................................................................... 1  Using the Evaluation Board Software .........................................4  AD7193 Evaluation Board............................................................... 1  Main Window ................................................................................5  Revision History ............................................................................... 2  ADC Setup .....................................................................................7  Evaluation Board Hardware ............................................................ 3  Configuration Assist Tool ............................................................8  Power Supplies .............................................................................. 3  Fast 50Hz Quick Test ....................................................................9  Sockets ........................................................................................... 3  Low Noise Quick Test ................................................................ 10  Noise Test....................................................................................... 3  User Units Setup ......................................................................... 11  Using an Absolute Reference ...................................................... 3  Evaluation Board Schematics and Artwork ................................ 12  Connecting the AD7193 to an External Microcontroller ....... 3  Ordering Information .................................................................... 16  Using the AD7193 Evaluation Board with the PC Software ....... 4  Bill of Materials ........................................................................... 16  Software Installation .................................................................... 4  REVISION HISTORY 12/10—Revision 0: Initial Version Rev. 0 | Page 2 of 20 Evaluation Board User Guide UG-223 EVALUATION BOARD HARDWARE AVDD POWER SUPPLIES There are several power supply options on the AD7193 evaluation board, which include the following: • The EVAL-AD7193EBZ evaluation board is powered via the 5 V supply from the USB connector, J51. This 5 V supply can power the AD7193 directly. Place the J1 link in the 5 V USB position. The 5 V supply from the USB connector can be regulated to 3.3 V using the on-board ADP3330ARTZ3.3, a high precision, low power, 3.3 V output voltage regulator. Therefore, using the J1 link, the 3.3 V can be used as power supply to the AD7193. Place the J1 link in the 3.3 V position. An external power supply can be applied via J6. Place the J1 link in the EXT position. REFIN1(+) 1kΩ AIN1 AIN2 AD7193 1kΩ 09552-003 • AVDD REFIN1(–) Figure 3. Noise Test Connections USING AN ABSOLUTE REFERENCE Header J5 allows the user to perform noise testing of the AD7193. Use Header J4 to apply the reference to the AD7193. With the links on both headers as configured per Figure 2, the analog input and reference are applied to the AD7193, as shown in Figure 3. An ADR421 is included on the EVAL-AD7193EBZ so that the part can also be evaluated using an absolute reference. The reference can be connected to the REFIN1(+)/REFIN1(−) pins of the AD7193 by connecting the links of J4 as shown in Figure 4. J4 09552-004 J4 09552-002 REF– AVDD REF+ REF– AIN2 AIN1 AVDD J5 AVDD NOISE TEST SOCKETS REF+ There are five sockets relevant to the operation of the AD7193 on this evaluation board. The functions of these sockets are outlined in Table 1. As per Figure 2, inserting the links in Header J5 connects a resistor network to the AD7193. The reference to the ADC is provided by AVDD. The resistor divider generates a bias voltage of approximately AVDD/2. Channel AIN1 and Channel AIN2 are connected to this voltage. Conversions can now be performed using this external short to measure the rms noise, peak-topeak noise, and peak-to-peak resolution. • Figure 4. Connecting an Absolute Reference to the AD7193 Figure 2. Link Positions for Noise Testing CONNECTING THE AD7193 TO AN EXTERNAL MICROCONTROLLER The EVAL-AD7193EBZ can be connected to an external microcontroller using Header J2. With all links in place, the AD7193 is connected to the on-board microcontroller. However, with these links removed, the AD7193 is disconnected from the evaluation board microcontroller. The user can then use a Header J2 to interface the AD7193 to the external microcontroller. Table 1. Socket Functions Socket REFIN1(+) REFIN1(−) AIN1 AIN2 MCLK Description Subminiature BNC (SMB) connector. This socket is used in conjunction with REFIN1(−) to apply an external reference to the AD7193. The voltage for the REFIN1(+) input of the AD7193 is applied to this socket. Subminiature BNC (SMB) connector. This socket is used in conjunction with REFIN1(+) to apply an external reference to the AD7193. The voltage for the REFIN1(−) input of the AD7193 is applied to this socket. Subminiature BNC (SMB) connector. Use this socket to apply an analog input signal to AIN1. Subminiature BNC (SMB) connector. Use this socket to apply an analog input signal to AIN2. Subminiature BNC (SMB) connector. Use this socket to apply an external clock source to the AD7193. Rev. 0 | Page 3 of 20 UG-223 Evaluation Board User Guide USING THE AD7193 EVALUATION BOARD WITH THE PC SOFTWARE SOFTWARE INSTALLATION EVALUATION BOARD INSTALLATION The AD7193 evaluation board software must be installed before connecting the EVAL-AD7193EBZ to the PC. To connect the evaluation board, do the following: 1. EVALUATION SOFTWARE INSTALLATION To install the evaluation software, do the following: 1. Insert the AD7193 Evaluation Kit CD into the CD-ROM drive of your PC. The Evaluation Software Installation Wizard should start automatically. If it does not start automatically, navigate to the AD7193 Evaluation Kit CD on your PC and click Setup.exe. 2. It then prompts you to select a destination directory, which is C:\Program Files\Analog Devices\AD7193 by default. When the directory is selected, the installation procedure copies the files into the relevant directories on the hard drive. The installation program creates a program group called Analog Devices with the subgroup AD7193 in the Start menu of the taskbar. 3. When the installation procedure is complete, double-click the AD7193 icon to start the program. 2. Connect the EVAL-AD7193EBZ to your PC USB connector using the USB cable included in the evaluation kit. The POWER LED on the evaluation board should turn on and Found new hardware wizard should start automatically on the PC. Follow the steps in the wizard until the installation is completed. USING THE EVALUATION BOARD SOFTWARE To start the AD7193 Evaluation Board Software on the PC • • Click the Windows® Start button. Go to All Programs/Analog Devices/AD7193/AD7193 Evaluation Board Software. The software allows the user to configure the AD7193, gather samples, and analyze the data. Consult the AD7193 data sheet for further information on the register bits and their functions. Figure 5 shows the main window that displays when the program starts. The Main Window section briefly describes the various menu and button options. The data that has been read can be exported to other packages, such as MathCAD™ or Microsoft® Excel, for further analysis. Rev. 0 | Page 4 of 20 UG-223 09552-005 Evaluation Board User Guide Figure 5. AD7193 Evaluation Software Main Window MAIN WINDOW User Units Setup Menu Bar File This button allows the user to change the display units on the graph and histogram. Selecting File allows the user to write the current set of data to a file for later use, log data as it is gathered, and exit the program. Sampling Buttons Delete Data/Clear Graphs This button allows the user to delete the data displayed in the graph. ADC Reset This button allows the user to sample continuously or to sample a specific number of samples. When the option Sampling: Capture Defined Sample Set is selected, the sample size is entered in the Samples text box. Start Sampling This button allows the user to read samples from the AD7193. This button allows the user to reset the AD7193 to its default (power on) settings. Data Display Units (V/mV/μV/nV) ADC Setup This button opens the ADC Setup window that allows the user to configure the AD7193. Fast 50 Hz Quick Test This button allows the user to display the conversions in hexadecimal, decimal, volts, or in user-specified units. If the conversions are displayed in volts, the value of the reference voltage must be entered in the Vref text box. Autoscale This button allows the user to easily select the fast filtering mode on the AD7193. This button allows the user to enable or disable the Autoscale function on the waveform plot. Low Noise Quick Test This button allows the user to access the noise testing software. Rev. 0 | Page 5 of 20 UG-223 Evaluation Board User Guide This button allows the user to have a fixed x-axis or a dynamic x-axis. When the x-axis is fixed, the number of samples to display is entered in the X-scale Samples text box. Analysis Channel The data channel to be analyzed is selected using this button. When the Analyse Last # Samples option is selected, the sample size must be entered in the Last # Samples text box. The software captures all samples generated by the AD7193. If the software fails to gather all samples, then the message shown in Figure 6 appears. The software may drop samples for the following reasons: • After Sampling The software can process the conversions as they are gathered, or it can process the samples when the ADC has completed the selected number of conversions. • • The data is being analyzed in parallel with the gathering of samples. You should delay the analysis until the samples are gathered. Other programs are running on the PC. PC is too slow. 09552-006 X-scale Analyse All Samples This feature allows you to fix the sample size used for analyzing. Alternatively, the software can process all samples gathered. Rev. 0 | Page 6 of 20 Figure 6. Error Message when Samples Not Captured Evaluation Board User Guide UG-223 ADC SETUP Voltage Reference The ADC Setup window gives the user access to the AD7193 registers. The user can write to the registers and read from the registers. This window operates even when an AD7193 evaluation board is not connected to the software. It operates as an AD7193 configuration tool. The reference source and reference value are programmed in this section. The user can select REFIN1 or REFIN2 (Ref Selection), enable/disable the reference detect function (Ref Detect), and set the voltage of the reference in the V text box. The ADC is reset to its default condition using this button. When the reference setup is changed, the changes needed for the configuration register are shown in the Registers HEX values section of the ADC Setup pane. ADC Read Clock Configuration Click this button to read the values of the registers on the AD7193. The ADC Setup window displays the hexadecimal values returned from the AD7193. The other sections of the ADC Setup panes are also updated to reflect the AD7193 configuration. The clock used by the AD7193 is selected in this pane. When an external master clock is selected, the clock frequency must be entered in the MHz text box. ADC Reset Digital Outputs The four digital outputs (P0, P1, P2, and P3) are programmed and enabled/disabled in this pane. ADC Write The information displayed in the Registers HEX values panes is written to the AD7193. Analog Inputs Select the analog input channels using the Channel Selection buttons. The gain, polarity, and chopping can also be selected. The analog inputs can be buffered or unbuffered using the Buffer button. Finally, the Diagnostics button enables/disables the burnout currents. Digital Filter The Output Data Rate (Hz), Sinc Notch (Hz), the order of the sinc filter, Averaging, Zero Latency, and enabling/disabling the 60Hz Rejection are programmed using these buttons. The user can enter the frequency of the sinc notch and the software calculates the value written to the FS[9:0] bits of the mode register. Alternatively, the user can enter the FS[9:0] value in decimal and the software calculates the sinc notch. When averaging is used, the first notch caused by the averaging is shown in the Avg Notch (Hz) text box. Mode of Operation This pane allows the user to select continuous conversion, single cycle conversion, calibration, and so on. Output Data Format This pane allows the user to select the output format of the data conversions and to enable the parity. When several analog inputs are enabled, the Data + Status feature should be enabled. Registers HEX values This window displays the values to be written to the AD7193 registers. When features such as the analog input channel, gain, and mode of operation are changed, the values in the Registers HEX pane are updated automatically. You can write directly to the Registers HEX pane, altering the contents of any register. When the values in this section are altered, the other sections of the ADC Setup window are updated to reflect the changes. The value written to the AD7193 is displayed in the Registers HEX values pane. Rev. 0 | Page 7 of 20 Evaluation Board User Guide 09552-007 UG-223 Figure 7. ADC Setup Window CONFIGURATION ASSIST TOOL The AD7193 Evaluation Software can be used as a configuration assist tool, even when an AD7193 evaluation board is not connected. The configuration assist tool can be used by doing the following: 2. 3. 4. When the AD7193 Evaluation Software opens, click the ADC Setup button. The message in Figure 8 appears. Click Ignore. The ADC Setup window will then open. In the ADC Setup window, the user can determine the values written to the AD7193 on-chip registers for different configurations. 09552-008 1. The Registers HEX values pane can be used. When the values in this section are altered, the other sections of the ADC Setup window are updated so that the user easily sees the impact of the register changes. Alternatively, the user can alter the Analog Inputs, Digital Filter, Voltage Reference, Mode of Operation, Clock Configuration, Digital Outputs, and Output Data Format panes. The Registers HEX values pane is updated with changes; therefore, the user can easily calculate the values written to the AD7193 for different configurations. Figure 8. Configuration Tool Rev. 0 | Page 8 of 20 Evaluation Board User Guide UG-223 FAST 50Hz QUICK TEST selected as the reference source. The software also provides instructions on the link positions for the AD7193 evaluation board. When the instructions given on each window are completed, click OK. The AD7193 gathers 100 samples, displays the results in the waveform, and analyzes the data to calculate the maximum conversion, minimum conversion, and average conversion. The rms noise, peak-to-peak noise, and resolution are also calculated. 09552-009 From the AD719x Evaluation Board Software main window, click the Fast 50Hz Quick Test button to configure the AD7193 to operate with the fast filter. When the Fast 50Hz Quick Test button is clicked, the AD7193 is configured to operate with the fast filter. The software configures the AD7193 to have a gain of 128, the sinc3 filter is selected with the first sinc filter notch at 800 Hz, and the averaging block is programmed to 16 to place a notch at 50 Hz. Channel AIN1–AIN2 is selected and REFIN1 is Figure 9. Fast 50Hz Quick Test Rev. 0 | Page 9 of 20 UG-223 Evaluation Board User Guide LOW NOISE QUICK TEST The software also provides instructions on the link positions for the AD7193 evaluation board. When the instructions given on each window are completed, click OK. The AD7193 gathers 100 samples, displays the results in the waveform, and analyzes the data to calculate the maximum conversion, minimum conversion, and average conversion. The rms noise, peak-topeak noise, and resolution are also calculated. 09552-010 From the AD719x Evaluation Board Software main window, click the Low Noise Quick Test Hardware Setup button. When the Low Noise Quick Test Hardware Setup button is clicked, the user can quickly and easily measure the rms noise of the AD7193. The software configures the AD7193 to have a gain of 128, an output data rate of 4.7 Hz, Channel AIN1–AIN2 is selected, and the reference voltage is set to 5 V (the software assumes that the 5 V from the USB is used as the reference to the AD7193). Figure 10. Low Noise Quick Test Hardware Setup Rev. 0 | Page 10 of 20 Evaluation Board User Guide UG-223 USER UNITS SETUP of the system can also be calibrated. The user can perform a system offset and system full-scale calibration. The resulting coefficients are held in memory; they are not written to the calibration registers of the ADC. 09552-011 From the AD719x Evaluation Board Software main window, click the User Units Setup button to open the User Units Setup window. The User Units Setup window allows the user to define the display units for the conversions. The offset and gain error Figure 11. User Units Setup Window Rev. 0 | Page 11 of 20 UG-223 Evaluation Board User Guide EVALUATION BOARD SCHEMATICS AND ARTWORK 09552-012 Figure 12. EVAL-AD7193EBZ Schematic, Analog Part Rev. 0 | Page 12 of 20 UG-223 09552-013 Evaluation Board User Guide Figure 13. EVAL-AD7193EBZ Schematic, Digital Part Rev. 0 | Page 13 of 20 Evaluation Board User Guide 09552-014 UG-223 09552-015 Figure 14. EVAL-AD7193EBZ Silkscreen Figure 15. EVAL-AD7193EBZ Component Side View Rev. 0 | Page 14 of 20 UG-223 09552-016 Evaluation Board User Guide Figure 16. EVAL-AD7193EBZ Solder Side View Rev. 0 | Page 15 of 20 UG-223 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 2. Qty. 1 1 1 1 1 3 1 1 1 8 5 17 3 3 1 2 7 4 4 1 4 3 1 1 1 5 1 Designator U1 U2 U51 U52 U53 LED1 to LED3 LED51 Y1 Y10 D1 C2 to C7, C16, C28 C1, C11, C17, C18, C25 C8 to C10, C19 to C24, C54 to C61 C51 to C53 C62 to C64 L1 R1, R2 R20 to R25, R54 R5, R6, R52, R53 R9 to R11, R51 R16 R17 R18, R55 to R57 J1, J4, J5 J2 J3 J6 J7 to J11 J51 Description AD7193 ADR421 reference USB controller 64K I2C EEPROM 3.3 V voltage regulator LED red, high intensity, 0603 LED red, high intensity (>90mCd), 0603 4.9152 MHz crystal 24 MHz crystal Diode Capacitor ceramic 10 μF tantalum capacitor 0.1 μF ceramic capacitor 12 pF ceramic capacitor 4.7 μF ceramic capacitor Ferrite bead 0 Ω resistor 100 Ω resistor 1 kΩ resistor 10 kΩ resistor 1.5 Ω resistor Resistor 100 kΩ resistor 2 × 3 way header 2 × 8 way header 1 × 16 way header Screw terminal block Connector, 50 Ω, straight, SMB Connector, USB Mini-B, SMD Rev. 0 | Page 16 of 20 Manufacturer Analog Devices Analog Devices Cypress Semiconductor Microchip Technology, Inc. Analog Devices Fairchild Avago Technologies Not inserted AVX Corporation ON Semiconductor Not inserted AVX Corporation Phycomp (Yageo) Phycomp (Yageo) Phycomp (Yageo) Tyco Electronics Phycomp (Yageo) Phycomp (Yageo) Phycomp (Yageo) Phycomp (Yageo) Phycomp (Yageo) Not inserted Phycomp (Yageo) Tyco Electronics Tyco Electronics Tyco Electronics Phoenix Contact Amphenol Molex Part Number AD7193BRUZ ADR421BRZ CY7C68013-56LFXC 24LC64-I/MC ADP3330ARZ-3.3 QTLP630C-4 HSMC-C191 Not inserted CX5032GB24000H0PESZZ P6SMB6.8AT3G Not inserted TAJA106M016R 2238 786 15649 2238 867 15129 2255 206 13672 BMB2A1000LN2 232270296001 RC0603FR-07100RL RC0603FR-071KL RC0603FR-0710KL RC0603FR-071R5L Not inserted RC0603FR-07100KL 1241050-3 1241050-8 1-1241050-2 (x2) 1727010 SMB1251B1-3GT30G-50 548190572 Evaluation Board User Guide UG-223 NOTES Rev. 0 | Page 17 of 20 UG-223 Evaluation Board User Guide NOTES Rev. 0 | Page 18 of 20 Evaluation Board User Guide UG-223 NOTES Rev. 0 | Page 19 of 20 UG-223 Evaluation Board 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. 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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. ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG09552-0-12/10(0) Rev. 0 | Page 20 of 20