Texas Instruments ADS7881EVM User Manual

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User's Guide
ADS7881EVM, ADS7891EVM Evaluation Module
Lijoy Philipose
This user's guide describes the characteristics, operation, and use of the ADS78x1
12-bit and 14-bit, parallel, analog-to-digital converter (ADC) evaluation module (EVM). Throughout this
document, the terms evaluation board, evaluation module, and EVM are synonymous with the ADS78x1EVM.
A complete circuit description, schematic diagram, layout, and bill of materials (BOM) are included in this
document.
1 Introduction.............................................................................................................................................................................2
1.1 Features.............................................................................................................................................................................
1.2 Analog Interface.................................................................................................................................................................
1.3 Digital Interface..................................................................................................................................................................
1.4 Power Supplies..................................................................................................................................................................
2 Using the EVM.........................................................................................................................................................................7
3 ADS78x1EVM Bill of Materials...............................................................................................................................................8
4 ADS78x1EVM Layout............................................................................................................................................................10
5 ADS78x1EVM Schematics...................................................................................................................................................
6 Revision History...................................................................................................................................................................
Figure 1-1. ADS7881 Input Buffer Circuit....................................................................................................................................
Figure 2-1. Decoding Control Signals Using the Address Bus....................................................................................................
Figure 4-1. Top Layer - Layer
Figure 4-2. Ground Plane - Layer
Figure 4-3. Power Plane - Layer 3............................................................................................................................................
Figure 4-4. Bottom Layer - Layer 4...........................................................................................................................................
Figure 5-1. Schematic Page 1: Digital
Figure 5-2. Schematic Page 2: ADS7881, ADS7891................................................................................................................
Figure 5-3. Schematic Page 3: Digital Communication.............................................................................................................
Table 1-1. Related Documentation from Texas Instruments........................................................................................................
Table 1-2. Analog Input Connector..............................................................................................................................................
Table 1-3. Solder Short Jumper
Table 1-4. Pin Out for Parallel Control Connector P2..................................................................................................................
Table 1-5. Jumper Settings..........................................................................................................................................................
Table 1-6. Data Bus Connector P3..............................................................................................................................................
Table 1-7. Pin Out for Converter Control Connector J3...............................................................................................................
Table 1-8. Power-Supply Test Points...........................................................................................................................................
Table 1-9. Power Connector, J1, Pin
Table 3-1. Bill of Materials............................................................................................................................................................8
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SLAU150A - DECEMBER 2004 - REVISED OCTOBER 2021
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ABSTRACT

Table of Contents

List of Figures
1.................................................................................................................................................10
2...........................................................................................................................................11
Buffer.............................................................................................................................14
List of Tables
Setting.......................................................................................................................................4
Out.....................................................................................................................................6
Copyright © 2021 Texas Instruments Incorporated
Data Acquisition Products
(ADS7881 and ADS7891)
ADS7881EVM, ADS7891EVM Evaluation Module
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