SBAU409A September   2022  – November 2022

 

  1.   Abstract
  2.   Trademarks
  3. 1Overview
    1. 1.1 ADS9218EVM-PDK Features
    2. 1.2 ADS9218EVM Features
  4. 2Analog Interface
    1. 2.1 ADS9218 Device Connections
    2. 2.2 ADC Differential Input Fully Differential Amplifier (FDA)
    3. 2.3 Common Mode Amplifier Drive
    4. 2.4 Voltage Reference
  5. 3Digital Interface
    1. 3.1 Clock Connection
  6. 4Power Supplies
  7. 5ADS9218EVM Software Installation
  8. 6EVM Operation
    1. 6.1 USB Driver Installation
    2. 6.2 Connecting the Hardware and Starting Software
    3. 6.3 Optional Connections to the EVM
    4. 6.4 Initial Required Setup on the Config Tab
    5. 6.5 Initial Required Setup on the Capture Tab
  9. 7Bill of Materials, Schematics, and Layout
    1. 7.1 Bill of Materials (BOM)
    2. 7.2 Schematics
    3. 7.3 Layout
  10. 8Revision History

4 Power Supplies

The TSWDC155EVM can provide power using the 3.3-V supply, but is not enabled by default on the TSWDC155EVM. Typical use requires external power on J17. The TSWDC155EVM provides the ADS9218EVM with a 3.3-V supply. The ADS9218EVM has a TPS61070 boost converter that boosts the 3.3-V supply to 5.4 V. This voltage is applied to low-dropout regulators (LDOs) to derive the AVDD and the DVDD supply. The TPS7A2050 provides the 5-V AVDD supply and the TPS7A2018 provides the 1.8-V DVDD supply. The required power connection is made through jumper J18 can be set to allow external power to be applied on screw terminal J17. In this case U2, an LM66100 device, provides reverse polarity protection if the connection is miswired. Figure 4-1 shows a schematic for various protection circuits.

Figure 4-1 Boost Converter, LDO, and Input Polarity Protection