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

2.2 ADC Differential Input Fully Differential Amplifier (FDA)

The THS4552 FDA is used to amplify the input signals applied to the SMA connector. The amplifier is a dual configuration for the two different ADC channels. Each channel is configured with the same discreet feedback components. The amplifier gain is set to 1 V/V and the bandwidth is set to 500 kHz for good performance up to 100 kHz. The ADS9218 Power Optimized Signal Chain Circuit reference design covers component selection and can help adjust component values for different optimizations.

Figure 2-2 shows a schematic of the FDA driver components.

Figure 2-2 FDA Driver Schematic