Texas Instruments ADS1675REF User Manual

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This user's guide describes the characteristics, operation, and use of the ADS1675REF reference design

board. This reference design board (REF) is an evaluation platform for the ADS1675, a 4MSPS,

high-speed, high-precision, 24-bit analog-to-digital converter (ADC). The ADS1675REF allows evaluation

of all aspects of the ADS1675 device. A complete circuit description as well as schematic diagram and bill

of materials are included.

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

http://www.ti.com

except where indicated.

ADCPro is a trademark of Texas Instruments.

Microsoft, Windows, WindowsXP, Vista are registered trademarks of Microsoft Corporation.

All other trademarks are the property of their respective owners.

SBAU162A – December 2009 – Revised September 2010

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Summary of Contents for Texas Instruments ADS1675REF

Page 1 ADS1675REF ADS1675REF This user's guide describes the characteristics, operation, and use of the ADS1675REF reference design board. This reference design board (REF) is an evaluation platform for the ADS1675, a 4MSPS, high-speed, high-precision, 24-bit analog-to-digital converter (ADC). The ADS1675REF allows evaluation of all aspects of the ADS1675 device.
Page 2: Table Of Contents
......................Reference Voltage ..................ADS1675REF Plug-in Operation ..................Schematic and Bill of Materials List of Figures .............. ADS1675REF Schematic: Typical Analog Input Section ..................ADS1675REF Reference Circuit ................ADCPro Software Start-up Display Window ................. ADS1675REF Plug-in Display Window ............ADS1675REF Plug-in Status Information Display Window ................
Page 3: Overview
You can connect the ADS1675REF to the XEM3010 board and then to a computer via an available USB port. This manual shows how to use the XEM3010 as part of the ADS1675REF kit, but does not provide technical details about the XEM3010 itself. Refer to the Opal Kelly website (at www.opalkelly.com) for specific details about the XEM3010-1500.
Page 4: Power-Supply Requirements
The SDRAM controller code is preloaded within the FPGA. The ADCPro software works with the USB 2.0 driver in the ADS1675REF environment, so that 8M, 24-bit sampled ADC data can be captured and saved in the SDRAM per single acquisition in order to allow the FPGA processor to do post-data processing or transfer the test data continually through the FPGA, SDRAM, and USB interface into a PC processor for further data processing.
Page 5: Analog Interface
To obtain the best THD performance, the ADS1675 requires an independent +5V supply to power the XEM3010 board. This voltage is applied to P1 on the XEM3010 from an external wall adapter power supply. For a quick function test, the +5V can be shared with the digital +5VD on the ADS1675REF by jumper JP4.
Page 6: Digital Interface
USB interface on the XEM3010 board. Reference Voltage The ADS1675REF provides a 3.0V reference source via a REF5030 (U2) and OPA211A (U5) to provide a high-quality reference voltage for ADS1675. The REF5030 (U2) generates the 3.0V reference signal. The output of the REF5030 is heavily filtered to remove noise.
Page 7: Ads1675Ref Reference Circuit
Reference Voltage www.ti.com Figure 2 shows the ADS1675REF reference circuit. +5VA TEMP TRIM 10 F 0.1 F REF5030AID 49.9W 0.15 F OPA211AIDGK 100W 10 F 10 F 0.1 F +5VA Figure 2. ADS1675REF Reference Circuit SBAU162A – December 2009 – Revised September 2010...
Page 8: Ads1675Ref Plug-In Operation
Closed Open Open To prepare to evaluate the ADS1675 with the ADS1675REF Plug-in, complete the following steps: Step 1. Verify all jumper settings against the settings described in Table Step 2. Download the latestversion of the ADCPro software from www.ti.com/adcpro.
Page 9: Adcpro Software Start-Up Display Window
NOTE: The software is continually under development. These instructions and screen images are current at the time of this writing, but may not exactly correspond to future releases. ADCPro uses a series of software plug-ins to communicate with the ADS1675REF. The ADS1675REF plug-in is included in the ADS1675REF package.
Page 10: Ads1675Ref Plug-In Display Window
Figure 4. ADS1675REF Plug-in Display Window Step 3. The ADS1675REF plug-in window has a status area at the top of the screen. When the plug-in is first loaded, the plug-in searches for the board. You will see a series of messages...
Page 11: Xem3010 Driver Installation (Screen 1)
ADS1675REF Plug-in Operation www.ti.com Figure 6. XEM3010 Driver Installation (Screen 1) Figure 7. XEM3010 Driver Installation (Screen 2) SBAU162A – December 2009 – Revised September 2010 ADS1675REF Submit Documentation Feedback Copyright © 2009–2010, Texas Instruments Incorporated...
Page 12: Xem3010 Driver Installation (Screen 3)
Step 8. The status area displays a connected message. The software is now ready to use. The Found New Driver wizard sequence should not appear again, unless you connect the board to a different USB port. ADS1675REF SBAU162A – December 2009 – Revised September 2010 Submit Documentation Feedback Copyright © 2009–2010, Texas Instruments Incorporated...
Page 13: Lvds Or Cmos Mode Selection
When you change a setting on the ADS1675REF plug-in, the setting is immediately updated on the board. Settings on the ADS1675REF correspond to settings described in the ADS1675 data sheet; see the...
Page 14: Six Default Data Rates For Lvds
Choose a test to run from the Test menu. In the example shown in Figure 14, the MultiFFT test was chosen. Figure 14. MultiFFT Test Plug-In (Example) ADS1675REF SBAU162A – December 2009 – Revised September 2010 Submit Documentation Feedback Copyright © 2009–2010, Texas Instruments Incorporated...
Page 15: Schematic And Bill Of Materials
REF, making sure to unload and reload the plug-in before reapplying power to the board. Schematic and Bill of Materials Schematics for the ADS1675REF are appended to this user's guide. The bill of materials is listed in Table Figure 16 shows a top-level silkscreen of the PCB.
Page 16: Ads1675Ref Bill Of Materials
Hazardous Substances (RoHS) Directive. Some part numbers may be either leaded or RoHS. Verify that purchased components are RoHS-compliant. (For more information about TI's position on RoHS compiance, see the Quality and Eco-Info information on the TI web site.) Table 3. ADS1675REF Bill of Materials Item Quantity Value Reference Designators...
Page 17: Ads1675Ref Silkscreen Drawing
Schematic and Bill of Materials www.ti.com Table 3. ADS1675REF Bill of Materials (continued) Item Quantity Value Reference Designators Description Part Number TP1, TP2, TP3, TP5, TP7, TP9, Test Point PC Mini .040"D Red Keystone 5000 TP11 TP4, TP6, TP8, TP10 Test Point PC Mini .040"D Black...
Page 18 Changed schematics to reflect Revision B of the board NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Revision History SBAU162A – December 2009 – Revised September 2010 Submit Documentation Feedback Copyright © 2009–2010, Texas Instruments Incorporated...
Page 19 Vin+ VOUT- THS4503ID 750pF VOUT+ Vin- AINP 80.5 -VCC +VCC 10uF 0.1uF +5VA TEMP TRIM REF5025ID 10uF 0.1uF 12500 TI Boulevard. Dallas, Texas 75243 Title: ADS1675REF Engineer: DOCUMENTCONTROL # REV: 6497434 Drawn By: FILE: DATE: SIZE: 9-Sep-2010 SHEET: Sheet 1_b...
Page 20 DGND DRATE[1] AINP DGND DRATE[2] DGND FPATH 4.7uF 0.1uF +5VA 100pF +3.3VD 22uF 0.1uF 4.7uF 4.7uF 0.1uF CONTROL 12500 TI Boulevard. Dallas, Texas 75243 Title: ADS1675REF Engineer: DOCUMENTCONTROL # REV: 6497434 Drawn By: FILE: DATE: SIZE: 9-Sep-2010 SHEET: Sheet 2_b...
Page 21 R35 NI +3.3VD +5VA 10uF 10uF 1000pF CONTROL +VCC 10uF 10uF 1000pF TP10 10uF 10uF 1000pF TP11 -VCC 12500 TI Boulevard. Dallas, Texas 75243 Title: ADS1675REF Engineer: DOCUMENTCONTROL # REV: 6497434 Drawn By: FILE: DATE: SIZE: 9-Sep-2010 SHEET: Sheet 3_b...
Page 22 Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
Page 23 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
Page 24 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments ADS1675REF...