SLWU067D November   2009  – March 2022 ADS4122 , ADS4125 , ADS4126 , ADS4128 , ADS4129 , ADS4142 , ADS4145 , ADS4146 , ADS4149 , ADS41B25 , ADS41B29 , ADS41B49 , ADS58B18 , ADS58B19

 

  1.   Trademarks
  2. 1Overview
    1. 1.1 Purpose
    2. 1.2 EVM Quick-Start Procedure
  3. 2Circuit Description
    1. 2.1 Schematic Diagram
    2. 2.2 Circuit Function
      1. 2.2.1 Power
        1. 2.2.1.1 Power Supply Option 1
        2. 2.2.1.2 Power Supply Option 2
        3. 2.2.1.3 Power Supply Option 3
      2. 2.2.2 Clock Input
        1. 2.2.2.1 Clock Option 1
        2. 2.2.2.2 Clock Option 2
        3. 2.2.2.3 Clock Option 3
      3. 2.2.3 Analog Inputs
        1. 2.2.3.1 Analog Input Option 1
        2. 2.2.3.2 Analog Input Option 2
      4. 2.2.4 Digital Outputs
  4. 3TI ADC SPI Control Interface
    1. 3.1 Installing the ADC SPI Interface
    2. 3.2 Setting Up the EVM for ADC SPI Control
    3. 3.3 Using the TI ADC SPI Interface Software
      1. 3.3.1 SPI Register Writes
  5. 4Quick Start Setup
  6. 5Evaluation
    1. 5.1 Register Programming
    2. 5.2 Quick-Test Results

2.2 Circuit Function

Selection of various modes of operation of the ADS41xx/58B18EVM is most often controlled by jumpers on the EVM, either by placing shunts on 0.025-inch square jumper posts or by installation of surface mount 0-Ω resistors. In general, the use of 0-Ω resistors as jumpers are used in the clock or signal path where signal integrity is critical and jumper posts are used for static or low-speed control paths. Figure 2-1 shows the relative location of the jumpers, connectors, and switches used on the ADS41xx/58B18EVM. Figure 2-2 shows the relative locations of most of the resistors and surface-mount 0-Ω jumper locations used on the EVM. In the description of the circuit options in the following sections, each operational mode is accompanied by a table entry that details the jumper or resistor changes that enable that option. Figure 2-1 and Figure 2-2 can assist the user to quickly identify where these jumpers are located on the EVM.

GUID-F6024D68-57E9-48BB-8D74-7B8D20B05F8D-low.gifFigure 2-1 ADS41xx Jumpers
GUID-49C67CF5-21EA-491C-AA78-45B20C71D534-low.gifFigure 2-2 ADS41xx/58B18 Surface Jumpers

The following sections describe the function of individual circuits. See the relevant data sheet for device operating characteristics.