Texas Instruments ADS7851EVM User Manual

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This user's guide describes the characteristics, operation and use of the ADS7851EVM performance

demonstration kit (PDK). This kit is an evaluation platform for the ADS7851, dual-channel, 14-bit,

simultaneous sampling, successive approximation register (SAR) analog-to-digital converter (ADC) that

supports fully-differential analog inputs. This EVM eases the evaluation of the ADS7851 device with

hardware and software for computer connectivity through a universal serial bus (USB). This user's guide

includes complete circuit descriptions, schematic diagram, and bill of materials.

Throughout this document, the terms demonstration kit, evaluation board, evaluation module are

synonymous with the ADS7851EVM-PDK.

The following related documents are available through the Texas Instruments web site at

http://www.ti.com.

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All other trademarks are the property of their respective owners.

SBAU217A – March 2014 – Revised March 2014

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Summary of Contents for Texas Instruments ADS7851EVM

Page 1 SBAU217A – March 2014 – Revised March 2014 ADS7851EVM-PDK ADS7851EVM-PDK This user's guide describes the characteristics, operation and use of the ADS7851EVM performance demonstration kit (PDK). This kit is an evaluation platform for the ADS7851, dual-channel, 14-bit, simultaneous sampling, successive approximation register (SAR) analog-to-digital converter (ADC) that supports fully-differential analog inputs.
Page 2 REFOUT_A and REFOUT_B Reference Connections .................. ADS7851EVM Default Jumper Settings ..........Bottom View of SDCC Board with microSD Memory Card Installed ............Connecting ADS7851EVM Board to SDCC Controller Board ..................LED Indicators on the SDCC Board ..............Welcome Screen and Destination Directory Screens ..............
Page 3 The ADS7851EVM-PDK is a platform for evaluation of the ADS7851 analog-to-digital converter (ADC). The evaluation kit combines the ADS7851EVM board with a serial data capture card (SDCC) controller board. The SDCC controller board consists of a TI Sitara embedded microcontroller (AM3352) and a field programmable gate array (FPGA).
Page 4 ± A1(±) SMA J3 (IN±) ± AINP-B (Pin 6) Header JP3.2 Figure 1. ADS7851EVM Analog Interface Input Connections Table 1 summarizes the JP1 through JP4 analog interface connectors. Table 1. JP1 to JP4: Analog Interface Connections Terminal Number Signal Description CHA negative differential input.
Page 5 . Therefore, the analog input full-scale range (FSR) for each ADC is four times ref_B the reference voltage (±2 × V The ADS7851EVM incorporates two THS4521 fully-differential amplifiers to drive the ADC inputs. The fully-differential amplifiers shift the signal to the appropriate common-mode voltage level. Figure 2...
Page 6 REFOUT_A ref_A Serial Interface 10 2F REFGND_A AINP_B ADC_B AINM_B REFOUT_B ref_B 10 2F REFGND_B Figure 3. REFOUT_A and REFOUT_B Reference Connections ADS7851EVM-PDK SBAU217A – March 2014 – Revised March 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
Page 7 Digital Interface www.ti.com Digital Interface Socket strip connector J6 provides the digital I/O connections between the ADS7851EVM board and the SDCC board. Section 3 summarizes the pinout for connector J6. Table 3. Connector J6 Pinout Terminal Number Signal Description J6.2, J6.10, J6.15, J6.16, Ground connections J6.18...
Page 8 The external AVDD supply applied to external two-terminal connector J5 must not exceed 5.5 V or device damage may occur. The external AVDD supply must be in the range of 5.0 V to 5.5 V for proper ADS7851EVM operation. ADS7851EVM-PDK SBAU217A –...
Page 9 ADS7851EVM-PDK Initial Setup www.ti.com ADS7851EVM-PDK Initial Setup This section presents the steps required to set up the ADS7851EVM-PDK kit before operation. Default Jumper Settings A silkscreen plot detailing the default jumper settings is shown in Figure Table 5 explains the configuration for these jumpers.
Page 10 5.2.1 Install the microSD Memory Card on the SDCC Controller Board The ADS7851EVM-PDK includes a microSD memory card that contains the EVM software and SDCC controller board firmware required for the EVM operation. NOTE: Ensure the microSD memory card that contains the software is installed in the microSD socket (P6) on the back of the SDCC board.
Page 11 Verify Jumpers are in the Factory-Default Position and Connect the Hardware The ADS7851EVM-PDK includes both the ADS7851EVM and the SDCC controller board; however, the devices are shipped unconnected. Follow these steps to verify that ADS7851EVM-PDK kit is configured and connected properly.
Page 12 Install the ADS7851EVM-PDK Software The ADS7851 EVM V#.#.# software must be installed on the PC. This software supports the ADS7851EVM-PDK. The user must have administrator privileges to install the EVM software. The following steps list the directions to install the software.
Page 13 Figure 11. Windows 7 Driver Installation Warning NOTE: Driver installation prompts do not appear if the SDCC device driver has been installed on your system previously. SBAU217A – March 2014 – Revised March 2014 ADS7851EVM-PDK Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
Page 14 Step 2. A computer restart may be required to finish the software installation. If prompted, restart the PC to complete the installation. Figure 12. SDCC Device Driver Installation Figure 13. SDCC Device Driver Completion ADS7851EVM-PDK SBAU217A – March 2014 – Revised March 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
Page 15 The ADS7851 EVM software (this software also supports the ADS7851EVM-PDK) provides control over the settings of the ADS7851. Adjust the ADS7851EVM settings when the EVM is not acquiring data. During acquisition, all controls are disabled and settings cannot be changed.
Page 16 1. Load the ADS7851EVM Settings page in the GUI. Hover the cursor over the red arrow at the left- center side of the GUI screen; a menu with different GUI pages appears. Click on ADS7851 EVM...
Page 17 ADS7851EVM-PDK Kit Operation www.ti.com 3. Scroll down in the ADS7851EVM Settings page and find the ADS7851 Analog Inputs connections description on the GUI. Figure 17 shows the input connections description on the ADS7851EVM Settings page of the GUI. The channel A differential input signal can be applied into the J1(-) and J2(+) SMA connectors or to the JP1.2(-) and JP2.2(+) header connectors.
Page 18 MSPS, and 900 kSPS respectively. Device Status— This panel shows the current clock frequency and data rate of the ADS7851. Figure 19. Data Monitor Page ADS7851EVM-PDK SBAU217A – March 2014 – Revised March 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
Page 19 EVM, click on the Save Data button and specify the file path and file name of the data file, as shown in Figure Figure 20. Saving Data to a Text File SBAU217A – March 2014 – Revised March 2014 ADS7851EVM-PDK Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
Page 20 FFT performance analysis display. The FFT calculated parameters are shown on the right side of the display. Figure 21. FFT Performance Analysis Page ADS7851EVM-PDK SBAU217A – March 2014 – Revised March 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
Page 21 The DC Leakage Bins field allows the number of frequency bins that are a result of the dc portion of the measurement to be excluded from the calculations. SBAU217A – March 2014 – Revised March 2014 ADS7851EVM-PDK Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
Page 22 The Noise Free Bits column displays the effective bits of the converter when calculated using the peak- to-peak noise. Troubleshooting If the ADS7851EVM software stops responding while the ADS7851EVM-PDK is connected, unplug the USB cable from the EVM, unload the ADS7851EVM-PDK software, reconnect the ADS7851EVM-PDK to the PC, and reload the ADS7851EVM software.
Page 23 Figure 23 Figure Figure 23. Open the GUI Settings page Figure 24. Set Capture Mode to SDCC Interface While Using the EVM Hardware SBAU217A – March 2014 – Revised March 2014 ADS7851EVM-PDK Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
Page 24 Section 7.2 shows the PCB layout for the ADS7851EVM. The schematics for the ADS7851EVM are appended to the end of this user's guide. Bill of Materials NOTE: All components should be compliant with the European Union Restriction on Use of Hazardous Substances (RoHS) Directive.
Page 25 Bill of Materials, PCB Layout, and Schematics www.ti.com Table 6. ADS7851EVM Bill of Materials (continued) Item No. Ref Des Description Vendor Part Number 'R70, R71, R72, RES, 10k ohm, 5%, 0.063W, 0402 Vishay Dale CRCW040210K0JNED R73, R74, R75 RES, 10k ohm, 1%, 0.063W, 0402...
Page 26 PCB layouts for the ADS7851EVM. NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out; they are not intended to be used for manufacturing ADS7851EVM PCBs. Figure 25. ADS7851EVM PCB: Top Layer Figure 26.
Page 27 Figure 27. ADS7851EVM PCB: Power Layer Figure 28. ADS7851EVM PCB: Bottom Layer Schematics The schematics for the ADS7851EVM are appended to the end of this user's guide. SBAU217A – March 2014 – Revised March 2014 ADS7851EVM-PDK Submit Documentation Feedback...
Page 28 Figure 17 to show updated screen shot NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Revision History SBAU217A – March 2014 – Revised March 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
Page 29 Assembly Variant: Variant name not interpreted Sheet: warrant that this design will meet the specifications, will be suitable for your application or fit for any particular purpose, or will operate in an implementation. Texas Instruments and/or its Drawn By: Luis Chioye File: Main_ADS7851EVM_RevA.SchDoc...
Page 30 Assembly Variant: Variant name not interpreted Sheet: warrant that this design will meet the specifications, will be suitable for your application or fit for any particular purpose, or will operate in an implementation. Texas Instruments and/or its Drawn By: File: Connector_ADS7851EVM_RevA.SchDoc...
Page 31 ADDITIONAL TERMS AND CONDITIONS, WARNINGS, RESTRICTIONS, AND DISCLAIMERS FOR EVALUATION MODULES Texas Instruments Incorporated (TI) markets, sells, and loans all evaluation boards, kits, and/or modules (EVMs) pursuant to, and user expressly acknowledges, represents, and agrees, and takes sole responsibility and risk with respect to, the following: 1.
Page 32 RADIO FREQUENCY REGULATORY COMPLIANCE INFORMATION FOR EVALUATION MODULES Texas Instruments Incorporated (TI) evaluation boards, kits, and/or modules (EVMs) and/or accompanying hardware that is marketed, sold, or loaned to users may or may not be subject to radio frequency regulations in specific countries.
Page 33 Les types d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2014, Texas Instruments Incorporated spacer Important Notice for Users of EVMs Considered “Radio Frequency Products”...
Page 34 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue.

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