logo资料库

AD7321/AD7322.pdf

发布时间：2022-06-14 发布人：admin 分类：说明书 资料大小：0.46M 资料格式：pdf 举报 版权申诉
第1页 / 共16页
第2页 / 共16页
第3页 / 共16页
第4页 / 共16页
第5页 / 共16页
第6页 / 共16页
第7页 / 共16页
第8页 / 共16页
资料共16页，剩余部分请下载后查看
    FEATURES
    GENERAL DESCRIPTION
    FUNCTIONAL BLOCK DIAGRAM
    TABLE OF CONTENTS
    REVISION HISTORY
    EVALUATION BOARD HARDWARE
    POWER SUPPLIES
    INITIAL SETUP CONDITIONS
    LINK OPTIONS
    INTERFACING THE EVALUATION BOARDS
    SOCKETS
    OPERATING THE EVAL-AD7321/AD7322
    EVALUATION BOARD SOFTWARE
    INSTALLING THE SOFTWARE
    CHECKING THE EVAL-CONTROL BRD2
    THE MAIN SCREEN
    Control Buttons
    Menu Bar
    Oscilloscope
    Fast Fourier Transform/Histogram
    LOAD CONFIGURATION SCREEN
    EVALUATION BOARD SCHEMATICS AND ARTWORK
    BILL OF MATERIALS
    ORDERING INFORMATION
    ORDERING GUIDE
    ESD CAUTION
    Evaluation Board for 2-Channel Software Selectable ADC EVAL-AD7321/AD7322 FEATURES Full featured evaluation board for the AD7321 and AD7322 devices Evaluation control board (EVAL-CONTROL BRD2) compatible Standalone capability On-board analog buffering and voltage reference Various linking options PC software for control and data analysis when used with EVAL-CONTROL BRD2 GENERAL DESCRIPTION This data sheet describes the evaluation board for the AD7321/ AD7322 devices. These devices are software selectable bipolar input 13-bit analog-to-digital converters (ADCs). These parts operate from single 2.7 V to 5.25 V and dual ±12 V power supplies and feature throughput rates of up to 500 kSPS/ 1 MSPS. Full details on these ADCs are available in the AD7321/ AD7322 data sheet, available from Analog Devices, Inc., and should be consulted in conjunction with this data sheet. On-board components include one AD780, a pin programmable 2.5 V or 3 V ultrahigh precision band gap reference, and one AD797 op amp. Various link options are provided in Table 2. This evaluation board is equipped with a 96-way connector. This 96-way connector is compatible with the EVAL-CONTROL BRD2, also available from Analog Devices, Inc. Note that the EVAL-CONTROL-BRD2 operates with all Analog Devices evaluation boards with part numbers ending with the letters CB in the Ordering Guide section of this data sheet. VIN0 VIN1 FUNCTIONAL BLOCK DIAGRAM EXT AVCC EXT VDD/VSS VDD VCC SCLK DN DOUT CS AD7321/ AD7322 REFIN REFIN AD780 EVAL-AD7321/EVAL-AD7322CB VDRIVE GND VSS EXT CS EXT DOUT EXT DIN EXT SCLK R O T C E N N O C E G D E Y A W - 6 9 Figure 1. Evaluation Board Block Diagram 1 0 0 - 5 5 2 6 0 Rev. 0 Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 ©2007 Analog Devices, Inc. All rights reserved. Fax: 781.461.3113
    EVAL-AD7321/AD7322 TABLE OF CONTENTS Features .............................................................................................. 1 General Description......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Evaluation Board Hardware............................................................ 3 Power Supplies .............................................................................. 3 Initial Setup Conditions .............................................................. 3 Link Options ................................................................................. 4 Interfacing the Evaluation Boards.............................................. 5 Sockets ........................................................................................... 6 Operating the EVAL-AD7321/AD7322 .................................... 6 Evaluation Board Software.............................................................. 7 Installing the Software ................................................................. 7 REVISION HISTORY 12/07—Revision 0: Initial Version Checking the EVAL-CONTROL BRD2 .....................................7 The Main Screen............................................................................7 Load Configuration Screen..........................................................8 Running the Software ...................................................................9 Software Configuration Files.................................................... 10 Configuring the Analog Inputs for Single-Ended and Differential Operation ............................................................... 10 Evaluation Board Schematics and Artwork................................ 11 Bill of Materials........................................................................... 13 Ordering Information.................................................................... 14 Ordering Guide .......................................................................... 14 ESD Caution................................................................................ 14 Rev. 0 | Page 2 of 16
    EVAL-AD7321/AD7322 reference are also decoupled with 10 μF tantalum and 0.1 μF ceramic capacitors as are the VDD, VSS, and VCC pins of the AD7321/AD7322. INITIAL SETUP CONDITIONS Care should be taken before applying power and signals to the evaluation board to ensure that all link positions are as per the required operating mode. Failure to do so could result in damage to the evaluation board. Table 1 outlines the default positions off all links when the board is shipped. All links are set so that all power supplies and control signals are supplied by the EVAL-CONTROL BRD2. EVALUATION BOARD HARDWARE POWER SUPPLIES When using this evaluation board with the EVAL-CONTROL BRD2, all supplies are provided from the controller board through the 96-way connector. When using the board as a standalone unit, external supplies must be provided. This evaluation board has five power supply inputs: EXT_VDD, AGND, +12 V, −12 V, and AGND. If the evaluation board is used in standalone mode, a 2.7 V to 5.5 V supply must be connected to the EXT_VDD input. The +12 V and −12 V supplies are required for the high voltage analog input on the AD7321/AD7322 and for the AD797 op amps. The supplies are decoupled to the ground plane with 10 μF tantalum and 0.1 μF multilayer ceramic capacitors at the point where they enter the board. The supply pins of all the op amps and the Table 1. Initial Link Positions Position Link No. Uninstalled LK1 LK2 A A LK3 C LK4 A LK5 LK6 C A LK7 A LK8 Uninstalled LK9, LK11 LK10 A B LK12 A LK25 A LK26 LK27 Installed Function AD780 supplies a 2.5 V reference to the AD7321/AD7322. AD780 supplies the reference to the AD7321/AD7322. VCC supply is taken from the EVAL-CONTROL BRD2. VDRIVE supply is taken from the VCC supply. CS is taken from the EVAL-CONTROL BRD2. SCLK signal is taken from the EVAL-CONTROL BRD2. DIN signal is taken from the EVAL-CONTROL BRD2. DOUT signal is sent to the EVAL-CONTROL BRD2. No 51 Ω termination on the inputs. SMB Connector J9 connected to input of AD797. Input to AD797 set to AGND. +12 V is supplied from the EVAL-CONTROL BRD2. −12 V is supplied from the EVAL-CONTROL BRD2. −12 V is supplied from the EVAL-CONTROL BRD2. Rev. 0 | Page 3 of 16
    EVAL-AD7321/AD7322 LINK OPTIONS Link options which must be set for the required operating setup before using the evaluation board. The functions of these options are outlined in Table 2. Table 2. Link No. LK1 LK2 LK3 LK4 LK5 LK6 LK7 LK8 LK9, LK11 LK10, LK12 LK25 LK26 LK27 Function Controls the program pin of the AD780 voltage reference. Selects the source of the REFIN voltage to be applied to the REFIN pin of the AD7321/AD7322. In Position A, the AD780 supplies the 2.5 V reference to the AD7321/AD7322. In Position B, the REFIN is supplied through the J4 SMB connector. Selects the source of the VCC supply for the AD7321/AD7322. In Position A, the VCC supply is taken from the 96-way connector to the EVAL-CONTROL BRD2. In Position B, the VCC supply is taken from the external J2 connector. Selects the source of the VDRIVE voltage for the AD7321/AD7322. In Position A, the VDRIVE voltage is taken from the external J3 V drive socket. In Position B, the VDRIVE voltage is taken from the 96-way connector to the EVAL-CONTROL BRD2. In Position C, the VDRIVE voltage is tied to the VCC voltage. Selects the source of the CS signal. In Position A, CS is taken from the 96-way connector to the EVAL-CONTROL BRD2. In Position B, the CS signal is taken from the J5 CS SMB socket. Selects the source of the SCLK signal for the AD7321/AD7322. In Position A, the SCLK signal comes from J6 SMB socket. In Position B, the SCLK signal comes from 7S04 inverter, which is an inverted SCLK signal from the 96-way connector. In Position C, the SCLK signal is taken directly from EVAL-CONTROL-BRD2 through the 96-way connector. Selects the source of the DIN signal to the AD7321/AD7322. In Position A, DIN is taken from the 96-way connector to the EVAL-CONTROL BRD2. In Position B, the DIN signal is taken from the J7 DIN SMB socket. Selects the destination of the DOUT signal from the AD7321/AD7322. In Position A, DOUT goes to the 96-way connector to the EVAL-CONTROL BRD2. In Position B, the DOUT signal goes to the DOUT J8 SMB socket. Adds a 51 Ω termination resistor to AGND at the VIN0 to VIN1 input sockets. Selects the input to the AD797 op amps. In Position A, the AD797 noninverting input it tied to the SMB socket. In Position B, the AD797 noninverting input it tied to AGND. Selects the source of the +12 V supply for the EVAL-AD7321/AD7322. In Position A, the +12 V supply is sourced from the EVAL-CONTROL BRD2 via the 96-way connector. In Position B, the +12 V supply is sourced externally via the J17 connector. Selects the source of the −12 V supply for the EVAL-AD7321/AD7322. In Position A, the −12 V supply is sourced from the EVAL-CONTROL BRD2 via the 96-way connector. In Position B, the −12 V supply is sourced externally via the J17 connector. Select the configuration of the noninverting input to U5. The configuration of this link depends on whether the board is being used in single-ended or differential mode. For single-ended mode, this link should be installed. For true differential mode, this link should be uninstalled. Rev. 0 | Page 4 of 16
    INTERFACING THE EVALUATION BOARDS Interfacing to the EVAL-CONTROL BRD2 is accomplished via a 96-way connector, J1. J1 is used to connect the EVAL-AD7321/AD7322 to the EVAL- CONTROL BRD2 or to another system. Table 3. Signal TFS0, RFS0 SCLK DR0 DT0 AGND DGND AVDD −12 V +12 V Description Transmit/Receive Frame Sync 0. These two outputs are connected to the CS pin of the AD7321/AD7322. Serial Clock 0. This serial clock is connected to the SCLK pin on the AD7321/AD7322. Data Receive 0. This input is connected to the SDATA pin of the AD7321/AD7322. Data Transmit 0. This output is connected to the DIN pin on the AD7321/AD7322. Analog Ground. These lines are connected to the analog ground plane on the evaluation board. Digital Ground. These lines are connected to the digital ground plane on the evaluation board. Analog +5 V Supply. These lines are connected to the VCC supply line on the board via LK3. −12 V Supply. This line is connected to the −12 V supply line on the board via LK26. +12 V Supply. This line is connected to the +12 V supply line on the board via LK25. EVAL-AD7321/AD7322 The pinout for the J1 connector is shown in Figure 2 and its pin designations and descriptions are given in Table 3 and Table 4. The unused pins of the 96-way connector are not shown. A B C 1 1 Figure 2. Pin Configuration for the 96-Way Connector J1 32 32 2 0 0 - 5 5 2 6 0 Table 4. Pin Designations for 96-Way Connector J11 Row C Pin 1 2 3 DGND 4 DR0 5 6 RFS0 7 DVDD 8 9 10 CS 11 DGND 12 13 14 15 DGND 16 17 18 19 DGND 20 AGND 21 AGND 22 23 AGND AGND 24 AGND 25 AGND 26 27 28 29 +12 V 30 31 32 AVDD 1 The unused pins of the 96-way connector are not shown. Row A DGND DT0 TFS0 SCLK0 DVDD RD DGND DGND DGND AGND AGND AGND AGND AGND AGND −12 V AVDD Row B DGND DVDD DGND DGND DGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AVDD Rev. 0 | Page 5 of 16
    EVAL-AD7321/AD7322 SOCKETS Input/output sockets are relevant to the operation of the AD7321/AD7322 on this evaluation board. The functions of these sockets are outlined in Table 5. Table 5. Socket J1 Function 96-way connector for serial interface and power supply connections. External VDD and AGND power connector. J2 External VDRIVE connector. J3 J17 External +12 V, −12 V, and AGND power connector. VIN0, VIN1 2 SMB sockets for bipolar input signal to op amps. REFIN SCLK CS DOUT DIN SMB socket for REFIN voltage. SMB socket for external SCLK input. SMB socket for external CS input. SMB socket for DOUT signal. SMB socket for external DIN signal. OPERATING THE EVAL-AD7321/AD7322 The evaluation board can be operated in a standalone mode or in conjunction with the EVAL-CONTROL BRD2. When operated with the EVAL-CONTROL BRD2, all supplies and control signals to operate the AD7321/AD7322 are provided by the EVAL-CONTROL BRD2. Software to communicate between the controller board and the AD7321/AD7322 is provided with the AD7321/AD7322 evaluation board kit. The EVAL-CONTROL BRD2 operates with all Analog Devices evaluation boards with model numbers ending in the letters CB. The 96-way connector is powered from a 12 V ac transformer. This is a standard 12 V ac transformer capable of supplying 1 A current and is available as an accessory from Analog Devices under the following part numbers: • • • (For use in the U.S. or Japan) (For use in the U.K.) (For use in Europe) EVAL-110VAC-US EVAL-220VAC-UK EVAL-220VAC-EU These transformers are also available from Digi-Key Corp. (U.S.) and Campbell Collins, Ltd. (U.K.) Connection between the EVAL-CONTROL BRD2 and the parallel port of a PC is via an IEEE 1284-compliant cable, provided as part of the EVAL-CONTROL BRD2 kit. Rev. 0 | Page 6 of 16
    EVALUATION BOARD SOFTWARE INSTALLING THE SOFTWARE Included in the EVAL-AD7321/AD7322CB evaluation kit is a CD-ROM, which contains software for controlling and evaluating the performance of the AD7321/AD7322 when it is operated with the EVAL-CONTROL BRD2. When the CD is inserted into the PC, an installation program automatically begins. This program installs the evaluation software onto the PC as well as electronic versions of the eval- uation board data sheets, the AD7321/AD7322 data sheet, and EVAL-CONTROL BRD2 data sheet. All literature on the CD is in the Adobe Systems, Inc. portable documentation format (PDF) and requires Acrobat Reader™ to be viewed or printed. The user interface on the PC is a dedicated program written especially for the AD7321/AD7322 when operated with the EVAL-CONTROL BRD2. CHECKING THE EVAL-CONTROL BRD2 The EVAL-CONTROL BRD2 and evaluation board should be connected together as described in the Interfacing the Evaluation Boards section. The power is applied to the EVAL-CONTROL BRD2 via a 12 V ac transformer. EVAL-AD7321/AD7322 At this stage, the red LED on the EVAL-CONTROL BRD2 should be flashing. This indicates that the EVAL-CONTROL BRD2 is functional and ready to receive instructions. Note that the software should be installed before the printer port cable is connected between the EVAL-CONTROL BRD2 and the PC. This ensures that the printer port has been initialized properly. THE MAIN SCREEN The software that controls the EVAL-CONTROL BRD2 and, thus, the AD7321/AD7322 consists of two screens. The main screen, shown in Figure 3, allows you to read a predetermined number of samples from the evaluation board and display them in both the time and frequency domain. The screen can be divided into three sections. The upper portion of the screen contains the control buttons, the menu bar, busy status indicators, and selection windows. Control Buttons Use the control buttons to take samples (Sample), reset the board (Reset), to exit the program (EXIT) and to load a configuration file (Device Select). 3 0 0 - 5 5 2 6 0 Figure 3. Main Screen Rev. 0 | Page 7 of 16
    EVAL-AD7321/AD7322 Menu Bar The menu bar (not visible in Figure 3) consists of the File and About menus. The File menu offers the following selections: • Load Raw Data. Select this option to load data saved by the software during a previous session. Save Raw Data. Select this option to save the current set of sample data points. The data can be reloaded to the EVAL- CONTROL BRD2 at a later date or can be used by other programs for further analysis. Save Binary Data. Select this option to save the current set of sample data points. The data is saved in binary format as a text file. This method can be useful for examining code flicker and looking for stuck bits. • • • Exit. Quits the program. The About drop-down menu provides information about the version of the software. Busy Status and Frequency/Num Samples Indicators • The Busy Status indicates when the evaluation board is busy. • The Frequency indicator shows the sample rate and Num Samples to be taken. Oscilloscope The middle portion of the main screen is a digital storage oscilloscope (DSO). Samples uploaded from the EVAL- CONTROL BRD2 are displayed here. Zoom handles, which appear at the bottom left of the graph, allow you to zoom in and out to get a closer look at a sample, if desired. The right side of the middle portion of the screen contains information about the samples taken, such as the minimum (Min) and maximum (Max) position or velocity, the spread (Spread), and the standard deviation (Std. Dev) and the mean (Mean). Fast Fourier Transform/Histogram The lower portion of the main screen shows either a fast Fourier transform (FFT) of the data or a histogram. The FFT (the default option) is typically used to with examine the performance in the frequency domain while the histogram gives an indication of the performance in response to dc inputs. The option dis- played can be changed by clicking on the Waveform, Histogram or FFT buttons, the right side of the lower portion of the screen contains information about the samples taken. LOAD CONFIGURATION SCREEN The Load Configuration screen, shown in Figure 4, loads the configuration file for the evaluation board. Once the configuration file is loaded, the software acquires detailed information about the AD7321/AD7322 evaluation board and the device connected to the EVAL-CONTROL BRD2. This includes information such as the number of bits, the maximum sampling rate, output coding, maximum sampling rate, and power supply requirements. The configuration file also communicates to the software the name of the DSP program file to download to the EVAL- CONTROL BRD2. The Load Configuration screen also allows you to choose the sampling frequency and the number of samples to take. Rev. 0 | Page 8 of 16
    分享到：
    赞 收藏

    相关推荐

    资料库

    开发技术

    共收录19306份资料，累计14个分类，关注成员有19位，主要包括：Actionscript,Javascript,PHP,VB,Perl,Delphi,Python,C#,C,Java,C++,Web开发,硬件开发,其它

    热门标签

    Actionscript Javascript PHP VB Perl Delphi Python C# C Java C++ Web开发 硬件开发 其它

    最新资料