Texas Instruments ADS7881, User Manual

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User’s Guide
ADS7881EVM, ADS7891EVM Evaluation Module
Lijoy Philipose Data Acquisition Products
ABSTRACT
This user's guide describes the characteristics, operation, and use of the ADS78x1 ( ADS7881 and ADS7891 )
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.
Table of Contents
1 Introduction ............................................................................................................................................................................. 2
1.1 Features............................................................................................................................................................................. 2
1.2 Analog Interface................................................................................................................................................................. 2
1.3 Digital Interface.................................................................................................................................................................. 4
1.4 Power Supplies.................................................................................................................................................................. 6
2 Using the EVM ......................................................................................................................................................................... 7
3 ADS78x1EVM Bill of Materials ............................................................................................................................................... 8
4 ADS78x1EVM Layout ............................................................................................................................................................ 10
5 ADS78x1EVM Schematics ................................................................................................................................................... 14
6 Revision History ................................................................................................................................................................... 17
List of Figures
Figure 1-1. ADS7881 Input Buffer Circuit.................................................................................................................................... 3
Figure 2-1. Decoding Control Signals Using the Address Bus.................................................................................................... 7
Figure 4-1. Top Layer – Layer 1................................................................................................................................................. 10
Figure 4-2. Ground Plane – Layer 2........................................................................................................................................... 11
Figure 4-3. Power Plane – Layer 3............................................................................................................................................ 12
Figure 4-4. Bottom Layer – Layer 4........................................................................................................................................... 13
Figure 5-1. Schematic Page 1: Digital Buffer............................................................................................................................. 14
Figure 5-2. Schematic Page 2: ADS7881, ADS7891................................................................................................................ 15
Figure 5-3. Schematic Page 3: Digital Communication............................................................................................................. 16
List of Tables
Table 1-1. Related Documentation from Texas Instruments........................................................................................................ 2
Table 1-2. Analog Input Connector.............................................................................................................................................. 2
Table 1-3. Solder Short Jumper Setting....................................................................................................................................... 4
Table 1-4. Pin Out for Parallel Control Connector P2.................................................................................................................. 4
Table 1-5. Jumper Settings.......................................................................................................................................................... 5
Table 1-6. Data Bus Connector P3.............................................................................................................................................. 5
Table 1-7. Pin Out for Converter Control Connector J3............................................................................................................... 6
Table 1-8. Power-Supply Test Points........................................................................................................................................... 6
Table 1-9. Power Connector, J1, Pin Out..................................................................................................................................... 6
Table 3-1. Bill of Materials............................................................................................................................................................ 8
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SLAU150A – DECEMBER 2004 – REVISED OCTOBER 2021
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