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
Trademarks
All trademarks are the property of their respective owners.
www.ti.com
Table of Contents
SLAU150A – DECEMBER 2004 – REVISED OCTOBER 2021
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