SLAU150A December   2004  – October 2021 ADS7881 , ADS7891

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Analog Interface
      1. 1.2.1 Signal Conditioning
      2. 1.2.2 Reference
    3. 1.3 Digital Interface
    4. 1.4 Power Supplies
  3. 2Using the EVM
  4. 3ADS78x1EVM Bill of Materials
  5. 4ADS78x1EVM Layout
  6. 5ADS78x1EVM Schematics
  7. 6Revision History

1 Introduction

The ADS78x1EVM showcases the 12-bit, 4-MSPS (ADS7881) and 14-bit, 3-MSPS (ADS7891) ADCs. The ADS7881 and ADS7891 devices include a capacitor-based successive-approximation register (SAR) ADC with inherent sample and hold. These devices offer either a 12-bit or 14-bit parallel interface. Both devices offer byte mode operation that enables easy interface with 8-bit processors. They also have a pseudo-differential input stage and a 2.5-V internal reference.

This evaluation module serves as a reference design and a low-cost method to test these converters in the end application. The following sections describe the pin outs of the various analog, power, and digital connectors and power requirements.

Table 1-1 lists documents related to the ADS78x1EVM.

Table 1-1 Related Documentation from Texas Instruments
Data Sheets Literature Number
ADS7881 SLAS400
ADS7891 SLAS410
ADS8411 SLAS369
THS4031 SLOS224
OPA132 SBOS054
REF1004-2.5 SBVS032
SN74AHC138 SCLS258
SN74AHC245 SCLS230
SN74AHC1G04 SCLS318