SBAU440 April   2024

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 ADS9219EVM Quick Start Guide
    2. 2.2 Analog Interface
      1. 2.2.1 High-bandwidth, Fully-Differential Circuit: THS4541
      2. 2.2.2 Voltage Reference
    3. 2.3 Power Supplies
      1. 2.3.1 USB Power and When to Power the Board Externally
  9. 3Software
    1. 3.1 Digital Interface and Clock Inputs
      1. 3.1.1 Digital Interface Connections
      2. 3.1.2 Clock Select
    2. 3.2 ADS9219EVM Software Reference
      1. 3.2.1 ADS9219EVM-GUI Software Installation
      2. 3.2.2 USB Driver Installation
      3. 3.2.3 Using the CONFIG Tab
      4. 3.2.4 Using the Capture Tab
      5. 3.2.5 Using the INL/DNL Tool
      6. 3.2.6 Using the Histogram Tab
  10. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials (BOM)
  11. 5Additional Information
    1. 5.1 Trademarks
  12. 6Related Documentation

2.3 Power Supplies

By default, the TSWDC155EVM provides the ADS9219EVM with a 3.3V supply ("3P3V"). The ADS9219EVM has a TPS61033 boost converter which increases the 3.3V supply to 5.5V. The 5.5V supply is applied to the input of two independent low-dropout regulators (LDOs) to derive the required analog and digital supplies for the ADS9219 when JP3 is in the [1-2] position. U2 (TPS7A2050) outputs 5V, which is used for the AVDD_5V supply. U4 (TPS7A2018) outputs 1.8V, which is shared between the AVDD_1V8 and DVDD_1V8 supplies.

The LDO input voltage (LDO_IN) can be changed to an external source ranging from 5.2V to 5.5V by configuring the shunt on JP3 in the [2-3] position and connecting the external supply to terminal block J4. In this setup, U1 (LM66100) provides reverse polarity protection in the event that the connection is wired incorrectly.

Figure 3-5 shows the power tree schematic for the ADS9219EVM.

GUID-20240403-SS0I-FBK3-M2HD-MBF3NVBWVWPR-low.svgFigure 2-5 Power Entry and Regulators