Texas Instruments ADS8686SEVM-PDK User Manual

Evaluation module

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This user's guide describes the characteristics, operation, and use of the ADS8686S evaluation module

(EVM) performance demonstration kit (PDK). The ADS8686S is a 16-channel, integrated front-end data

acquisition (DAQ) system based on a dual, simultaneous-sampling, 16-bit successive approximation

(SAR) analog-to-digital converter (ADC). Each input channel on the device supports true bipolar input

ranges of ±10 V, ±5 V, or ±2.5 V with single-supply operation. The device includes an analog front-end

offering a 1-MΩ, constant resistive input impedance. The ADS8686SEVM supports all the mentioned

features and provides provisions for an external reference, user-selectable oversampling ratio, and

features 16 input channels. The EVM-PDK eases the evaluation of the ADS8686S device and any devices

derived from the ADS8686X family with hardware, software, and computer connectivity through the

universal serial bus (USB) interface. This user's guide includes complete circuit descriptions, schematic

diagrams, and a bill of materials using the ADS8686S device as an example throughout the document.

Throughout this document, the terms EVM-PDK and ADS8686SEVM are synonymous with the

ADS8686SEVM-PDK.

The following related documents are available through the Texas Instruments web site at www.ti.com.

SBAU319 – November 2019

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Summary of Contents for Texas Instruments ADS8686SEVM-PDK

Page 1 ADS8686S device as an example throughout the document. Throughout this document, the terms EVM-PDK and ADS8686SEVM are synonymous with the ADS8686SEVM-PDK. The following related documents are available through the Texas Instruments web site at www.ti.com. Related Documentation Device...
Page 2: Table Of Contents
................. LabVIEW Run-Time Engine Installation ................Software Installation Complete Prompts ................ADS8686S EVM Folder Post-Installation ............ADS8686SEVM-PDK Hardware Setup and LED Indicators ................Launch the ADS8686SEVM GUI Software ..................EVM GUI Global Input Parameters ..................Register Map Configuration Display .................
Page 3 LabVIEW is a trademark of National Instruments. Phoenix Contact is a trademark of Samtec, Inc. All other trademarks are the property of their respective owners. SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 4: Overview
Overview The ADS8686SEVM-PDK is a platform for evaluating the performance of the ADS8686X family. The EVM- PDK comes with the ADS8686S SAR ADC, a 16-channel, 16-bit, ±10-V, ±5-V, or ±2.5-V input range, simultaneous-sampling ADC device. The evaluation kit includes the ADS8686SEVM board and the precision host interface (PHI) controller board that enables the accompanying computer software to communicate with the ADC over the USB for data capture and analysis.
Page 5: Evm Analog Interface
0 Ÿ AIN_0B_P Terminal Block Installed 1000 pF (8x1) 0 Ÿ Installed AIN_0B_GND 1 kŸ 0 Ÿ Figure 1. ADS8686SEVM Analog Input Connections for Channels SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 6 Analog input for channel AIN_4B J-14 AIN_5B Analog input for channel AIN_5B J-15 AIN_6B Analog input for channel AIN_6B J-16 AIN_7B Analog input for channel AIN_7B ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 7: Ads8686S Internal Reference And Evm Onboard Reference
EEPROM is no longer used. ADS8686S Digital Interface The ADS8686SEVM-PDK supports parallel, parallel byte, and serial digital interface as detailed in the ADS8686S data sheet. The PHI controller is configured to operate at a 3.3-V logic level and is directly connected to the digital I/O lines of the ADC.
Page 8: Power Supplies
2.3 V < DVDD < AVDD for proper device operation. Do not exceed the absolute maximum ratings for the ADS8686S device, or damage may occur. ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 9: High-Voltage Power Supplies
When connecting an external power supply to T6 use a clean and precise supply, otherwise damage can occur to the driving amplifiers U6 and U7. SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 10: Initial Setup
Initial Setup This section explains the initial hardware and software setup procedure that must be completed for the proper operation of the ADS8686SEVM-PDK. Default Jumper Settings Install a shunt at JP6 to select the internal reference. Install a shunt between JP7 (pins 2 and 3) as shown Figure 4 to connect the onboard regulated AVDD 5.0-V supply.
Page 11: Evm Graphical User Interface (Gui) Software Installation
The following steps list the directions to install the software using the ADS8686S as an example. Download and install the ADS8686SEVM software GUI from he ADS8686SEVM-PDK product folder. Administrator privileges are required on the PC to install the EVM software.
Page 12: Ads8686S Device Driver Installation Wizard Prompts
TheADS8686SEVM-PDK requires the LabVIEW™ Run-Time Engine. A prompt appears for the installation of this software, as shown in Figure 7, if not already installed. Figure 7. LabVIEW Run-Time Engine Installation ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 13: Software Installation Complete Prompts
The installation is now complete. The prompts shown in Figure 8 confirm that the software is installed. Figure 8. Software Installation Complete Prompts Verify that the contents of C:\Program Files (x86)\Texas Instruments\ADS8686 EVM is as shown in Figure 9 after installation. Figure 9. ADS8686S EVM Folder Post-Installation SBAU319 –...
Page 14: Operation
LEDs D1 and D2 on the PHI starts blinking to indicate that the PHI is booted up and communicating with the PC. Figure 10 shows the resulting LED indicators. Figure 10. ADS8686SEVM-PDK Hardware Setup and LED Indicators ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback...
Page 15: Launch The Ads8686Sevm Gui Software
3. As shown in Figure 11, double click the ADS8686EVM.exe file to launch the EVM GUI. Figure 11. Launch the ADS8686SEVM GUI Software SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 16: Evm Gui Global Settings For Adc Control
Mode pane displays the operational mode the device is currently in, which also persists across the GUI tools and pages. Figure 12. EVM GUI Global Input Parameters ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 17: Register Map Configurations
DB12/SDOA and DB11/SDOB that can be selected in the Serial Output Mode field. Parallel interface communication occurs through the DB[15:0] parallel bus, parallel byte through the DB[7:0] parallel bus. SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 18: Device Configuration In Software Mode
Each stack can support non-corresponding input channels between ADC A and ADC B. Figure 14. Device Configuration in Software Mode ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 19: Device Configuration Display In Hardware Mode
The Float Detection option is displayed as a drop-down field in the Device Configurations page because the Register Map Config page is inaccessible in hardware mode. Figure 15. Device Configuration Display in Hardware Mode SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 20: Time Domain Display Tool
RMS voltage value for the captured signal on each channel. Figure 16. Time Domain Display ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 21: Spectral Analysis Tool
24- bit ADC. The None option corresponds to not using a window (or using a rectangular window), and is not recommended. SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 22: Histogram Analysis Tool
As shown in Figure 18, the histogram corresponding to a dc input is displayed on clicking on the Capture button. Figure 18. Histogram Analysis Tool ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 23: Linearity Analysis Tool
NOTE: This analysis can take a couple of minutes to run; therefore, the evaluation board must remain undisturbed during the complete duration of the analysis. Figure 19. Linearity Analysis Tool SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 24: Bill Of Materials, Pcb Layout, And Schematics
R5, R6, R7, R8, R9, R10, R11, R12, R17, R18, R19, CRCW0402100KFKED Vishay-Dale RES, 100 k, 1%, 0.063 W, 0402 R20, R21, R22, R23, R24, R25, R26, R124 ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 25 D4, D5, D6, D7, D8, D9, D10, SMBJ14CA D11, D12, D13, D14, D15, Littelfuse Diode, TVS, Bi, 14 V, SMB D16, D17, D18, D19 SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 26 R128 Yageo America RES, 0, 5%, 0.063 W, 0402 TPS61220DCKR Texas Instruments Low Input Voltage, 0.7V Boost Converter with 5.5uA Quiescent Current, DCK0006A (SOT-SC70-6) ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 27: Pcb Layout
Figure 21. ADS8686S EVM PCB Layer 1: Top Layer Figure 22. ADS8686S EVM PCB Layer 2: GND Plane Figure 23. ADS8686S EVM PCB Layer 3: Power Planes SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 28 Bill of Materials, PCB Layout, and Schematics www.ti.com Figure 24. ADS8686S EVM PCB Layer 4: Bottom Layer Figure 25. ADS8686S EVM PCB: Bottom Overlay ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 29: Schematics
100k DVDD DVDD D_HW_RNGSEL1 DVDD HW_RNGSEL1 100k D_CHSEL2 CHSEL2 100k Assembly Note REFSEL REFSEL On JP6 place jumper short 10.0k Figure 26. ADS8686SEVM-PDK Schematic SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 30 AIN6_GND AIN3+ AIN7+ AIN3 AIN7 1.00k 1.00k AIN7+ SMBJ14CA SMBJ14CA 1000pF 1000pF AIN7 AIN7_GND AIN3_GND AIN7_GND AIN3GND AIN7GND 1.00k 1.00k Figure 27. ADS8686SEVM-PDK Schematic ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 31 1.00k SMBJ14CA SMBJ14CA BIN7+ R108 R109 1000pF 1000pF BIN7 BIN7_GND R110 R111 BIN3_GND BIN7_GND BIN3GND BIN7GND 1.00k 1.00k R112 R113 Figure 28. ADS8686SEVM-PDK Schematic SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 32 TPS7A4700RGWR AVDD AVDD AVDD DVDD VOUT 10.0k TRIM/NR REFINOUT 0.22 REFINOUT TEMP 2.7k AVDD DVDD REF5025AIDGKT 10uF 150080VS75000 Bright Green Figure 29. ADS8686SEVM-PDK Schematic ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 33 DB11/SDOB DB10/SDI DB9/BYTESEL DB8/FLTEN ID_PWR ID_PWR DB5/CRCEN DB4/SER1W SER/PAR/BYTE D_HW_RNGSEL1 D_HW_RNGSEL0 0.1uF R126 SEQEN 10.0k EVM_ID_SCL 5-146261-1 EVM_ID_SDA 0.1uF BR24G32FVT-3AGE2 Figure 30. ADS8686SEVM-PDK Schematic SBAU319 – November 2019 ADS8686SEVM-PDK Evaluation Module Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 34 These assemblies must be clean and free from ﬂux and all contaminants. Use of no clean ﬂux is not acceptable. Assembly Note These assemblies must comply with workmanship standards IPC-A-610 Class 2, unless otherwise speciﬁed. Figure 31. ADS8686SEVM-PDK Schematic ADS8686SEVM-PDK Evaluation Module SBAU319 – November 2019 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated...
Page 35 STANDARD TERMS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms set forth herein.
Page 36 www.ti.com Regulatory Notices: 3.1 United States 3.1.1 Notice applicable to EVMs not FCC-Approved: FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and software developers to write software applications for use with the end product.
Page 37 www.ti.com Concernant les EVMs avec antennes détachables Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à...
Page 38 www.ti.com EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS. 4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling or using the EVM, including without limitation any warning or restriction notices.
Page 39 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2019, Texas Instruments Incorporated...
Page 40 TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable warranties or warranty disclaimers for TI products. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2019, Texas Instruments Incorporated...

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