SBAU378A September   2021  – January 2022 ADS1148 , ADS1248

 

  1.   Trademarks
  2. 1Introduction
  3. 2Getting Started With the ADS1x48EVM
  4. 3ADS1x48EVM Overview
    1. 3.1 Analog and Digital Power Supplies
    2. 3.2 Voltage Reference Options
    3. 3.3 Clock Options
    4. 3.4 Digital Interface
    5. 3.5 Analog Input Connections
      1. 3.5.1 Connecting a Thermocouple to J5 on the ADS1x48EVM
      2. 3.5.2 Connecting a Thermistor to J5 on the ADS1x48EVM
        1. 3.5.2.1 Using Thermistor RT1 for Thermocouple Cold Junction Compensation
      3. 3.5.3 Connecting an RTD to J6 on the ADS1x48EVM
        1. 3.5.3.1 Connecting a 2-Wire RTD Using a Low-Side RREF to J6 on the ADS1x48EVM
        2. 3.5.3.2 Connecting a 2-Wire RTD Using a High-Side RREF to J6 on the ADS1x48EVM
        3. 3.5.3.3 Connecting a 3-Wire RTD Using One IDAC and a Low-Side RREF to J6 on the ADS1x48EVM
        4. 3.5.3.4 Connecting a 3-Wire RTD Using One IDAC and a High-Side RREF to J6 on the ADS1x48EVM
        5. 3.5.3.5 Connecting a 3-Wire RTD Using Two IDACs and a Low-Side RREF to J6 on the ADS1x48EVM
        6. 3.5.3.6 Connecting a 3-Wire RTD Using Two IDACs and a High-Side RREF to J6 on the ADS1x48EVM
        7. 3.5.3.7 Connecting a 4-Wire RTD Using a Low-Side RREF to J6 on the ADS1x48EVM
        8. 3.5.3.8 Connecting a 4-Wire RTD Using a High-Side RREF to J6 on the ADS1x48EVM
        9. 3.5.3.9 Summary of ADS1x48EVM RTD Configuration Settings
      4. 3.5.4 Connecting a General-Purpose Input to J5 on the ADS1x48EVM
  5. 4ADS1x48EVM GUI
    1. 4.1 Home
      1. 4.1.1 Menu Bar
        1. 4.1.1.1 File Menu
        2. 4.1.1.2 Options Menu
        3. 4.1.1.3 Tools Menu
        4. 4.1.1.4 Help Menu
    2. 4.2 Data Capture
      1. 4.2.1 Time Domain and Histogram Statistics
      2. 4.2.2 Time Domain Plot
      3. 4.2.3 Histogram Plot
      4. 4.2.4 FFT Statistics and Plot
    3. 4.3 Register Map
      1. 4.3.1 Register Read and Write Options
        1. 4.3.1.1 Read Register Options
        2. 4.3.1.2 Write Register Options
  6. 5Bill of Materials, Printed Circuit Board Layout, and Schematic
    1. 5.1 Bill of Materials
    2. 5.2 Printed Circuit Board Layout
    3. 5.3 Schematic
  7. 6Revision History

1 Introduction

The ADS1x48EVM is a fully assembled evaluation platform designed to highlight the ADS1x48 features and modes of operation that make this device suitable for measuring analog temperature sensors. The EVM sits on top of an accompanying precision ADC motherboard (PAMBoard) used as a USB-to-PC GUI communication bridge. This board combination also serves as an example implementation of connecting a microcontroller (MCU) to communicate with the ADS1x48 device through a serial-peripheral interface (SPI). Figure 1-1 shows a functional block diagram for the ADS1x48EVM.

Note:

The ADS1x48EVM requires an external controller to evaluate the ADS1x48 device.

The PAMBoard is controlled by commands received from the ADS1x48EVM GUI, and returns data to the GUI for display and analysis. If the PAMBoard is not used, the EVM plug-in module format allows for an alternative external host to communicate with the ADS1x48 through the pin headers J1 through J4. Header connections are identified in Section 5.2 and listed in Table 3-2.

The combined ADS1x48EVM and PAMBoard incorporate the following features:

  • ADS1x48, a 16- or 24-bit delta-sigma ADC with eight input channels
  • Input terminal block and jumper configurations that enable easy measurement of many types of analog temperature sensors
  • Analog voltage (AVDD) selection of 3.3-V or 5-V operation for the ADS1x48
  • Multiple voltage reference options: 2.048-V reference integrated into the ADS1x48, discrete REF5025, ratiometric reference for RTD measurements, or external reference supplied via the input terminal blocks
  • Internal or external clock selection
  • SPI for communication and configuration
GUID-20210702-CA0I-JQ9T-BZCC-MXJ3LGD8ZZLQ-low.gifFigure 1-1 ADS1x48EVM Functional Block Diagram

Table 1-1 lists documents related to the ADS1x48EVM.

Table 1-1 Related Documentation
DeviceLiterature Number
ADS1248SBAS426
ADS1148SBAS453
REF5025SBOS410