SBAU456 September   2024 ADS9212

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Hardware
    1. 2.1 ADS9212EVM Quick Start Guide
    2. 2.2 Power Supplies
      1. 2.2.1 USB Power and When to Power the Board Externally
    3. 2.3 Analog Interface
      1. 2.3.1 ADC Input SMA Connections
      2. 2.3.2 Voltage Reference
    4. 2.4 Digital Interface Connections
    5. 2.5 Digital Interface and Clock Inputs
  7. 3Software
    1. 3.1 ADS9212EVM-GUI Software Installation
    2. 3.2 USB Driver Installation
    3. 3.3 Using the CONFIG Tab
    4. 3.4 Using the Capture Tab
    5. 3.5 Using the INL/DNL Tool
    6. 3.6 Using the Histogram Tab
  8. 4Hardware Design Files
    1. 4.1 Schematics
      1. 4.1.1 ADS9212EVM Schematics
    2. 4.2 Layout
    3. 4.3 Bill of Materials (BOM)
  9. 5Additional Information
    1. 5.1 Trademarks
  10. 6Related Documentation

2.3.2 Voltage Reference

The ADS9212 uses an internal 4.096V reference voltage, which can be measured on the REFIO pin when configured as an output (default). For applications which require improved drift performance, configure the REFIO pin as an input and apply an external reference voltage to the pin.

The ADS9212EVM includes a provision for evaluating the REF7040 reference IC. The REF70xx family of high precision series voltage references offers the industry’s lowest noise (0.23ppmp-p), very low temperature drift coefficient (2ppm/°C), and high accuracy (±0.025%). In addition, these precision reference devices feature high PSRR, low drop-out voltage and excellent load and line regulation to help meet strict transient requirements. The REF7040 on the EVM is the 4.096V output voltage option. To connect the REF7040 (U4) to the ADS9212, configure the REFIO pin as an input via the GUI and then install a shunt on jumper JP6.

ADS9212EVM REF7040Figure 2-4 REF7040