SBAU431A July   2024  – October 2026

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Performance Development Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1  EVM Analog Input Options
    2. 2.2  Common-Mode Amplifier
    3. 2.3  Analog Input Circuit
    4. 2.4  RTD Current Source
    5. 2.5  Voltage Reference
    6. 2.6  ADC Connections and Decoupling
    7. 2.7  Power Supplies
    8. 2.8  SYNC / Clock Divide Circuit
    9. 2.9  Clocking
    10. 2.10 Serial Interface
    11. 2.11 EEPROM
    12. 2.12 Using the ADS1282EVM With an External Controller
  9. 3Software
    1. 3.1 Software Description
    2. 3.2 ADS1282 EVM Software Installation
  10. 4Implementation Results
    1. 4.1 EVM Operation
      1. 4.1.1 Evaluation Setup
      2. 4.1.2 EVM Register Settings
        1. 4.1.2.1 Channel Configuration
        2. 4.1.2.2 PGA Gain Selection
        3. 4.1.2.3 Data Rate Configuration
      3. 4.1.3 Time Domain Display
      4. 4.1.4 Spectral Analysis Display
      5. 4.1.5 Histogram Analysis Display
      6. 4.1.6 GUI Data Export
  11. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layouts
    3. 5.3 Bill of Materials (BOM)
  12. 6Additional Information
    1. 6.1 Trademarks
  13. 7Related Documentation
    1. 7.1 Supplemental Content
  14. 8Revision History

2.1 EVM Analog Input Options

Connect differential analog input signals to pins +AINx and -AINx (x denoting channels 1 and 2) on terminal blocks J3 and J1 as shown in Figure 4-1. The EVM common-mode amplifier circuit shown in Figure 2-2 uses 20kΩ resistors to bias the differential inputs to the correct mid-scale voltage when using a floating input source. This configuration is useful for floating sensors such as geophones and hydrophones.

Set the common-mode voltage as follows if the differential input source has an established common-mode voltage relative to GND: +2.5V for the default unipolar power configuration (AVDD = +5.3V, AVSS = GND); or 0V for the optional bipolar power configuration (AVDD = +2.8V, AVSS = -2.5V).

Each of the differential input pairs accepts up to a 5VPP differential signal with a common-mode voltage of +2.5V (default unipolar supply) or 0V (optional bipolar supply). The REF54500 provides the EVM default 5V reference voltage. Refer to Figure 2-1 for details on the recommended voltage span for the AINP and AINN inputs with respect to GND.

ADS1282V2EVM-PDK Maximum Input Signal Range (VREF = 5V)Figure 2-1 Maximum Input Signal Range (VREF = 5V)