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Texas Instruments ADS8402 EVM, ADS8412 EVM manual

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Table of contents for the manual

  • Page 1

    ADS8402/ADS8412EVM December 2003 Data Acquistion User ’ s G uide SLAU126[...]

  • Page 2

    IMPORT ANT NOTICE T exas 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 orde[...]

  • Page 3

    EVM IMPORT ANT NOTICE T exas 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 EV ALUA TION PURPOSES ONL Y and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of[...]

  • Page 4

    EVM W ARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range o f ± 6 V and the output voltage range of 0 V and 5.5 V . Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representa[...]

  • Page 5

    Related Documentation From T exas Instruments iii Preface Read This First About This Manual This users guide describes the characteristics, operation, and use of the ADS8402/ADS8412 16-bit, high speed, parallel interface analog-to-digital converter evaluation board. A complete circuit description as well as a schematic diagram and bill of materials[...]

  • Page 6

    Contents iv FCC Warning This equipment is intended for use in a laboratory test environment only . It gen- erates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable protection against radio f[...]

  • Page 7

    Contents v Contents 1 EVM Overview 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Features 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Introduction 1-2 . . . . .[...]

  • Page 8

    Contents vi Figures 1 - 1 Input Buf fer Circuit 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1 T op Layer—Layer 1 5-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 2 Ground Plane—Layer 2 [...]

  • Page 9

    1-1 EVM Overview EVM Overview This chapter contains the features of the ADS8402/ADS8412. T opic Page 1.1 Features 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Introduction 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cha[...]

  • Page 10

    Features 1-2 1.1 Features - Full-featured evaluation board for the high-speed ADS8402 (1.25 MSPS) and the ADS8412 (2 MSPS) high speed, 16-bit, single channel, parallel interface SAR-type analog-to-digital converters. - Onboard signal conditioning - Onboard reference - Input and output digital buffer - Onboard decoding for stacking multiple EVMs 1.2[...]

  • Page 11

    2-1 Analog Interface Analog Interface The ADS8402/ADS8412EVM analog-to-digital converter has a unipolar differential input. A unipolar dif ferential input is a differential signal (inverting and noninverting input is 180 degrees out of phase) that is level shifted such that the signals levels are always equal to or above zero volts. The peak-to-pea[...]

  • Page 12

    Signal Conditioning 2-2 2.1 Signal Conditioning The ADS8402/ADS8412EVM comes installed with the unity gain buffer (U2) wired for single-ended in to differential out configuration. The common-mode voltage is derived from a REF3040 reference IC and is adjustable using a potentiometer (R9). The common-mode voltage pin of the THS4503 is set to 2 V on t[...]

  • Page 13

    Reference 2-3 Analog Interface Figure 2 - 1. Input Buffer Circuit 1 k Ω 1 k Ω +V CC V I 0.1 µ F 1 µ F 25 Ω (+) IN (-) I N 6800 pF 1 µ F 0.1 µ F 1 k Ω -V CC - + 60 pF 1 k Ω 60 pF V OCM 25 Ω - + THS4503 +2.048 V 2.2 Reference The EVM allows users to select from three reference sources. The ADS8402/ADS8412EVM provides an onboard 4.096-[...]

  • Page 14

    2-4[...]

  • Page 15

    3-1 Digital Interface Digital Interface The ADS8402/ADS8412 EVM is designed for easy interfacing to multiple platforms. Samtec part numbers SSW -1 10-22-F-D-VS-K and TSM-1 10-01-T -DV -P provide a convenient dual row header/socket combination at P2 and P3. Consult Samtec at www .samtec.com or 1 - 800 - SAMTEC - 9 for a variety of mating connector o[...]

  • Page 16

    3-2 T able 3 - 2. Jumper Settings for Decoder Outputs Reference Designator Description Jumper Settings Reference Designator Description 1-2 2-3 W2 Set A[2..0] = 0x1 to generate RD pulse Installed † Not installed W2 Set A[2..0] = 0x2 to generate RD pulse Not installed Installed W5 Set A[2..0] = 0x3 to generate CONVST pulse Installed † Not instal[...]

  • Page 17

    4-1 Power Supply Requirements Power Supply Requirements The EVM accepts four power supplies. - A dual ± Vs dc supply for the dual supply op-amps. Recommend ± 7 Vdc supply . - A single +5-Vdc supply for the analog section of the board (A/D + Reference). - A single +5-V or +3.3-Vdc supply for the digital section of the board (A/D + address decoder [...]

  • Page 18

    4-2[...]

  • Page 19

    5-1 Using the EVM Using the EVM The ADS8402/ADS8412EVM serves three functions: 1) As a reference design 2) As a prototype board 3) As a software test platform T opic Page 5.1 As a Reference Board 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2 As a Prototype Board 5-2 . . . . . . . . . . . . . . . . . . . .[...]

  • Page 20

    As a Reference Board 5-2 5.1 As a Reference Board As a reference design, the ADS8402/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 n[...]

  • Page 21

    6-1 ADS8402/ADS8412EVM BOM, Layout, and Schematic ADS8402/ADS8412EVM BOM, Layout, and Schematic This chapter contains the ADS8402/ADS8412EVM bill of materials, the layouts, and the schematics. T opic Page 6.1 ADS8402/ADS8412EVM Bill of Materials 6-2 . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 ADS8402/ADS8412EVM Layout 6-4 . . . . . . . . [...]

  • Page 22

    ADS9393EVM Bill of Materials 6-2 6.1 ADS9393EVM Bill of Materials T able 6 - 1 contains a complete bill of materials for the ADS8402/ADS8412EVM. 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. T able 6 - 1. ADS8402/ADS8412EVM Bill Of Ma[...]

  • Page 23

    ADS9393EVM Bill of Materials 6-3 ADS8402/ADS8412EVM BOM, Layout, and Schematic Item No. QTY V alue Designator Footprint Mfg Mfg’ s Part Number Description 22 4 10 µ F C14, C24, C27, C29 6032 Panasonic - ECG or Alternate ECS - T1EC106R Capacitor 10 µ F 25-V tantalum TE SMD 23 1 22 µ F C30 805 TDK Corporation C2012X5R0J226M Capacitor CER 22 µ F[...]

  • Page 24

    ADS8402/ADS8412EVM Layout 6-4 6.2 ADS8402/ADS8412EVM Layout Figure 6 - 1. T op Layer—Layer 1 Figure 1.[...]

  • Page 25

    ADS8402/ADS8412EVM Layout 6-5 ADS8402/ADS8412EVM BOM, Layout, and Schematic Figure 6 - 2. Ground Plane—Layer 2[...]

  • Page 26

    ADS8402/ADS8412EVM Layout 6-6 Figure 6 - 3. Power Plane—Layer 3[...]

  • Page 27

    ADS8402/ADS8412EVM Layout 6-7 ADS8402/ADS8412EVM BOM, Layout, and Schematic Figure 6 - 4. Bottom Layer—Layer 4[...]

  • Page 28

    ADS8402/ADS8412EVM Schematic 6-8 6.3 ADS8402/ADS8412EVM Schematic The following pages contain the schematic for the ADS8402/ADS8412EVM.[...]

  • Page 29

    1234 56 A B C D 6 5 4 3 2 1 D C B A ti 12500 TI Boulevard. Dallas, T exas 75243 TITLE: SHEET: OF: FILE: SIZE: REV: Drawn By: Engineer: Revision History REV E CN Number Approved DOCUMENT CONTROL #: 13 BlockDiagram.sch A DATE: 22-Oct-2003 ADS8402/ADS8412EVM Block Diagram 6446998 -IN +IN EXT_REF B_CS B_RD B_CONVST B_BYTE B_RESET BUSY DB[15...0] Analog[...]

  • Page 30

    1 2 3 4 5 6 A B C D 6 5 4 3 2 1 D C B A ti 12500 TI Boulevard. Dallas, T exas 75243 TITLE: SHEET: OF: FILE: SIZE: REV: Drawn By: Engineer: Revision History REV E CN Number Approved DOCUMENT CONTROL #: 23 Analog-to-Digital Converter A DATE: 22-Oct-2003 Analog-to-Digital Converter 6446998 C21 0.01uF C43 0.1uF C42 0.1uF C48 0.01uF C41 0.01uF C47 0.1uF[...]

  • Page 31

    1234 56 A B C D 6 5 4 3 2 1 D C B A ti 12500 TI Boulevard. Dallas, T exas 75243 TITLE: SHEET: OF: FILE: SIZE: REV: Drawn By: Engineer: Revision History REV E CN Number Approved DOCUMENT CONTROL #: 33 Power & Digital B uffer A DATE: 22-Oct-2003 Power Supply & Digital Buffer Circuit 6446998 L4 BLM21A J601SN1L L2 BLM21A J601SN1L L1 BLM21A J601[...]