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ADS8402/ADS8412EVM December 2003 Data Acquistion User ’ s G uide SLAU126.
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.
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.
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.
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.
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 w.
Contents v Contents 1 EVM Overview 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Features 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents vi Figures 1 - 1 Input Buf fer Circuit 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1 T op Layer—Layer 1 5-4 . . . . . . . . . . . . . . . . . . . . . . . . .
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 . . .
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.
2-1 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.
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).
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.
2-4.
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.
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.
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).
4-2.
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 . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
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 .
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.
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 Panaso.
ADS8402/ADS8412EVM Layout 6-4 6.2 ADS8402/ADS8412EVM Layout Figure 6 - 1. T op Layer—Layer 1 Figure 1..
ADS8402/ADS8412EVM Layout 6-5 ADS8402/ADS8412EVM BOM, Layout, and Schematic Figure 6 - 2. Ground Plane—Layer 2.
ADS8402/ADS8412EVM Layout 6-6 Figure 6 - 3. Power Plane—Layer 3.
ADS8402/ADS8412EVM Layout 6-7 ADS8402/ADS8412EVM BOM, Layout, and Schematic Figure 6 - 4. Bottom Layer—Layer 4.
ADS8402/ADS8412EVM Schematic 6-8 6.3 ADS8402/ADS8412EVM Schematic The following pages contain the schematic for the ADS8402/ADS8412EVM..
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.
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.
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 .
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