Texas Instruments ADS8402 User Manual
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Texas Instruments ADS8402 User Manual

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ADS8402/ADS8406/ADS8412 EVM User's Guide
This
user's
ADS8402/ADS8406/ADS8412 16-bit, high-speed, parallel interface, analog-to-digital converter
evaluation board. A complete circuit description, schematic diagram, and bill of materials are
included.
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TMS320C5000, TMS320C6000 are trademarks of Texas Instruments.
SLAU126A - December 2003 - Revised September 2004
guide
describes
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SLAU126A - December 2003 - Revised September 2004
characteristics,
operation,
Contents
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List of Figures
List of Tables
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ADS8402/ADS8406/ADS8412 EVM User's Guide
User's Guide
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  • Page 1: Table Of Contents

    SLAU126A – December 2003 – Revised September 2004 ADS8402/ADS8406/ADS8412 EVM User's Guide This user's guide describes characteristics, operation, ADS8402/ADS8406/ADS8412 16-bit, high-speed, parallel interface, analog-to-digital converter evaluation board. A complete circuit description, schematic diagram, and bill of materials are included. Contents ....................EVM Overview .................... Analog Interface .....................

  • Page 2: Evm Overview

    EVM Overview EVM Overview Features • Full-featured evaluation board for the ADS8402 (1.25 MHz), ADS8406 (1.25 MHz), and ADS8412 (2 MHz) high-speed 16-bit, single channel, parallel interface SAR-type analog-to-digital converters. • Onboard Signal Conditioning • Onboard Reference • Input and Output Digital Buffers •...

  • Page 3: Input Buffer Circuit

    Figure 1 was optimized to achieve the ac (i.e., SNR, THD, SFDR, etc) specifications listed in the ADS8402, ADS8406, and ADS8412 data sheets. The 68-pF and 6800-pF capacitors in the signal path are polypropylene type, manufactured by WIMA Corporation. Polypropylene capacitors cause the least distortion of the input signal;...

  • Page 4: Digital Interface

    P1 pin 20. The user reference voltage and onboard reference voltages can be filtered by installing amplifier U1. The ADS8402, ADS8406, and ADS8412 analog-to-digital converters have a integrated onboard reference buffer; therefore, it is not necessary to buffer the voltage externally.

  • Page 5: Jumper Settings For Decoder Outputs

    This evaluation module provides direct access to all the analog-to-digital converter control signals via connector J3; see Table (1) All even-numbered pins of P3 are tied to DGND. SLAU126A – December 2003 – Revised September 2004 ADS8402/ADS8406/ADS8412 EVM User's Guide...

  • Page 6: Power Supplies

    VD as the source for the digital buffer voltage supply (+BVDD). Table 8. Power Connector, J1, Pinout Signal Power Connector - J1 Signal +VA (7 V) –VA (–7V) 5 VA DGND AGND 3.3 VD 5 VD ADS8402/ADS8406/ADS8412 EVM User's Guide SLAU126A – December 2003 – Revised September 2004...

  • Page 7: Using The Evm

    3. As software test platform As a Reference Board As a reference design, the ADS8402/ ADS8406/ADS8412EVM contains the essential circuitry to showcase the analog-to-digital converter. This essential circuitry includes the input amplifier, reference circuit, and buffers. The EVM analog input circuit is optimized for 100-kHz sine wave; therefore, users may need to adjust the resistor and capacitor values of the A/D input circuit.

  • Page 8: Ads8402/Ads8406/Ads8412Evm Bom

    ADS8402/ADS8406/ADS8412EVM BOM ADS8402/ADS8406/ADS8412EVM BOM Table 9 contains a complete bill of materials for the ADS8402/ ADS8406/ADS8412 EVM. The schematic diagram is also provided for reference. Contact the Product Information Center or e-mail dataconvapps@list.ti.com for questions regarding this EVM. Table 9. Bill of Materials...
  • Page 9 SOT23-3 CMOS voltage reference THS4503 8-SOP(D) Texas Instruments THS4503ID High-speed fully-differential amplifiers SOCKET_ ADS8402 Texas Instruments ADS8402IPFBT ADS8402 16-bit 1.25 MSPS 48QFP OPA627AU 8-SOP(D) NOT INSTALLED NOT INSTALLED Amplifier Footprint for 8 pin SOIC reference that 8-SOP(D) operates from 5 V...

  • Page 10: Ads8402/Ads8406/Ads8412Evm Layouts

    ADS8402/ADS8406/ADS8412EVM Layouts ADS8402/ADS8406/ADS8412EVM Layouts This section contains the EVM layouts. Figure 2. Top - Layer 1 ADS8402/ADS8406/ADS8412 EVM User's Guide SLAU126A – December 2003 – Revised September 2004...

  • Page 11: Ground Plane - Layer 2

    ADS8402/ADS8406/ADS8412EVM Layouts Figure 3. Ground Plane - Layer 2 SLAU126A – December 2003 – Revised September 2004 ADS8402/ADS8406/ADS8412 EVM User's Guide...

  • Page 12: Power Plane - Layer 3

    ADS8402/ADS8406/ADS8412EVM Layouts Figure 4. Power Plane - Layer 3 ADS8402/ADS8406/ADS8412 EVM User's Guide SLAU126A – December 2003 – Revised September 2004...

  • Page 13: Ads8402/Ads8406/Ads8412Evm Schematic

    ADS8402/ADS8406/ADS8412EVM Schematic Figure 5. Bottom - Layer 4 ADS8402/ADS8406/ADS8412EVM Schematic The schematic is located on the following pages. SLAU126A – December 2003 – Revised September 2004 ADS8402/ADS8406/ADS8412 EVM User's Guide...
  • Page 14 B_DB15 ADC Data Bus CONVST BYTE RESET B_BUSY ADC Control DC_CS INTc Parallel Control 12500 TI Boulevard. Dallas, Texas 75243 TITLE: ADS8402/ADS8406/ADS8412EVM Block Diagram Engineer: Lijoy Philipose DOCUMENT CONTROL #: REV: 6446998 Drawn By: Lijoy Philipose FILE: BlockDiagram.sch DATE: 29-Jul-2004...
  • Page 15 10uF 0.1uF 0.01uF +5VCC +VCC 0.01uF 0.1uF 0.01uF 0.1uF +VBD 0.1uF BUSY 0.1uF 0.01uF REFIN BUSY REFOUT BDGND +VBD AGND ADS8402/ADS8412 AGND 68pF +5VCC +5VCC AGND AGND BDGND DB[15...0] 0.1uF 0.01uF 0.1uF 0.01uF 0.01uF 0.1uF +VBD +VCC +5VCC 0.1uF 0.01uF 0.1uF...
  • Page 16 Revision History ECN Number Approved +5VCC +VCC +AVCC BLM21AJ601SN1L BLM21AJ601SN1L 10uF 0.1uF 0.01uF 10uF 10uF 0.01uF 10uF +VBD 10uF +BVDD 0.01uF 10uF BLM21AJ601SN1L 10uF 0.1uF 0.01uF 10uF BLM21AJ601SN1L -VCC +VBD +VBD 0.1uF +VBD DB[17...0] DB[17...0] B_DB0 B_DB1 +VBD B_DB2 B_DB3 B_DB4 0.1uF B_DB5...
  • Page 17 ADS8402/ADS8406/ADS8412EVM Schematic Related Documentation from Texas Instruments To obtain a copy of any of the following TI documents, call the Texas Instruments Literature Response Center at (800) 477-8924 or the Product Information Center (PIC) at (972) 644-5580. When ordering, identify this document by its title and literature number. Updated documents can also be obtained through the TI Web site at www.ti.com...
  • Page 18 EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use.
  • Page 19 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...
  • Page 20 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments ADS8402EVM ADS8412EVM ADS8406EVM...

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