Texas Instruments ADS8481EVM User Manual
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Texas Instruments ADS8481EVM User Manual

Texas Instruments ADS8481EVM User Manual

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This user's guide describes the characteristics, operation, and use of the ADS8481
18-bit, 1-MHz, parallel interface, analog-to-digital converter evaluation board. A
complete circuit description, schematic diagram, and bill of materials are included.
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Appendix C
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Input Buffer Circuit
B-1
B-2
B-3
B-4
B-5
B-6
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Analog Input Connector
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Analog Circuitry Jumper
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Pinout for Parallel Control Connector P3
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Jumper Position
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Data Bus Connector P2
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Pinout for Converter Control Connector, J6
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Power Supply Test Points
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Power Connector, J1, Pinout
SLAU182A - June 2006 - Revised September 2006
Submit Documentation Feedback
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ADS8481EVM Schematic
List of Figures
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List of Tables
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SLAU182A - June 2006 - Revised September 2006
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ADS8481EVM
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Summary of Contents for Texas Instruments ADS8481EVM

  • Page 1: Table Of Contents

    Introduction ..................Analog Interface ..................Digital Interface ..................Power Supplies ................Using the ADS8481EVM ..........Related Documentation from Texas Instruments ............Appendix A ADS8481EVM Bill of Materials ..............Appendix B ADS8481EVM LAYOUT .............. Appendix C ADS8481EVM Schematic List of Figures ..................

  • Page 2: Evm Overview

    C47, or wiring in a signal separately. The negative input pin, which has a range of –200 mV up to 200 mV, is shorted to ground on the ADS8481EVM via SJP9. A signal for the positive input pin can be...
  • Page 3 V. The necessary DC component to offset the signal is generated by U4. U4 is the low-noise THS4032 amplifier. If necessary, it can be configured to further filter the reference voltage IC, U2, and provide positive or negative gains. The ADS8481EVM leaves the factory with potentiometer, R24, set to 1.024 V. Table 1 indicates how the solder pad jumpers should be set to select for the various supply and input options for the analog driver circuitry.

  • Page 4: Digital Interface

    The ADS8481 can operate with an external reference voltage in the range of 3 V up to 4.2 V. It generates an on-chip 4.096-V reference voltage. The ADS8481EVM allows the user to select the external reference voltage from three sources. The first option is to use the internally generated 4.096 V from the ADC. The other two options are to select from the 3-V onboard reference (U1) or a user-supplied voltage applied at pin 20 of P1.
  • Page 5 Data bit 14 DB14 P2.29 P2.30 Ground Data bit 15 DB15 P2.31 P2.32 Ground Data bit 16 DB16 P2.33 P2.34 Ground Data bit 17 DB17 P2.35 P2.36 Ground SLAU182A – June 2006 – Revised September 2006 ADS8481EVM Submit Documentation Feedback...

  • Page 6: Power Supplies

    DGND AGND +3.3 VD +5VD Using the ADS8481EVM The ADS8481EVM serves the functions of being a reference design, a prototyping board, and finally as an software test platform. ADS8481EVM SLAU182A – June 2006 – Revised September 2006 Submit Documentation Feedback...

  • Page 7: Related Documentation From Texas Instruments

    This essential circuitry includes the input amplifier, reference circuit, and buffers. The ADS8481EVM analog input circuit is optimized for a wide bandwidth signal; therefore, the user may need to adjust the input buffer circuitry to better suit your needs. In AC-type applications where signal distortion is a concern, the user should use high quality capacitors such as Mica, polypropylene or COGs type capacitors in the signal path.
  • Page 8 Related Documentation from Texas Instruments ADS8481EVM SLAU182A – June 2006 – Revised September 2006 Submit Documentation Feedback...

  • Page 9: Appendix Aads8481Evm Bill Of Materials

    Appendix A Appendix A ADS8481EVM Bill of Materials The following table contains a complete bill of materials for the ADS8481EVM. The schematic diagram also is provided for reference in Appendix C. Contact the Product Information Center or send an e-mail to dataconvapps@list.ti.com for questions regarding this EVM.
  • Page 10 Test point PC MINI 0.040"D Red TP11 TP12 Electronics TP_0.025 TP1 TP2 TP8 test_point2 Keystone 5001K–ND Test point PC MINI 0.040"D Black TP10 TP13 Electronics TP14 ADS8481EVM Bill of Materials SLAU182A – June 2006 – Revised September 2006 Submit Documentation Feedback...

  • Page 11: Appendix Bads8481Evm Layout

    Appendix B Appendix B ADS8481EVM LAYOUT Appendix B contains the EVM layout. Figure B-1. Top Layer – Layer 1 SLAU182A – June 2006 – Revised September 2006 ADS8481EVM LAYOUT Submit Documentation Feedback...

  • Page 12: Ground Plane - Layer

    Appendix B Figure B-2. Ground Plane – Layer 2 ADS8481EVM LAYOUT SLAU182A – June 2006 – Revised September 2006 Submit Documentation Feedback...

  • Page 13: Power Plane - Layer

    Appendix B Figure B-3. Power Plane – Layer 3 SLAU182A – June 2006 – Revised September 2006 ADS8481EVM LAYOUT Submit Documentation Feedback...

  • Page 14: Bottom Layer - Layer

    Appendix B Figure B-4. Bottom Layer – Layer 4 ADS8481EVM LAYOUT SLAU182A – June 2006 – Revised September 2006 Submit Documentation Feedback...

  • Page 15: Top Overlay

    Appendix B Figure B-5. Top Overlay SLAU182A – June 2006 – Revised September 2006 ADS8481EVM LAYOUT Submit Documentation Feedback...

  • Page 16: Bottom Overlay

    Appendix B Figure B-6. Bottom Overlay ADS8481EVM LAYOUT SLAU182A – June 2006 – Revised September 2006 Submit Documentation Feedback...
  • Page 17 Appendix C Appendix C ADS8481EVM Schematic The ADS8481EVM schematic is appended to this page. SLAU182A – June 2006 – Revised September 2006 ADS8481EVM Schematic Submit Documentation Feedback...
  • Page 18 Revision History ECN Number Approved Analog-to-Digital Converter 11 12 13 14 15 16 17 18 19 20 EXT_REF Analog Input Power & Digital Buffer +AVCC B_DB[17...0] B_DB[17...0] B_DB0 +5VA B_DB1 DGND AGND B_DB2 B_DB3 +3.3VD +5VD B_DB4 B_DB5 B_DB6 +BVDD B_DB7 +BVDD B_DB8...
  • Page 19 Revision History **VRE4141** ECN Number Approved +5VCC EXT_REF +VIN VREF SJP1 49.9 22uF GND_F OUT_F GND_F OUT_F GND_S OUT_S 0.47uF GND_S OUT_S ENABLE 0.47uF ENABLE +5VCC REF3230 +5VCC +5VCC +5VCC REF3240 B_CS B_CS B_RD 2.2uF B_RD B_CONVST 2.2uF B_CONVST B_BYTE B_BYTE B_BUS18/16 B_BUS18/16...
  • Page 20 Revision History TP11 ECN Number Approved +VCC +5VCC +AVCC MMZ2012R601A MMZ2012R601A 10uF 1000pF 10uF 1000pF 10uF 10uF TP10 TP13 +VBD +BVDD MMZ2012R601A 10uF 1000pF 1000pF 10uF 10uF 10uF TP12 TP14 MMZ2012R601A -VCC +VBD +VBD 0.1uF +VBD DB[17...0] DB[17...0] DB10 B_DB10 DB11 B_DB11 +VBD...
  • Page 21 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 22 TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products...

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