SBAU439 January   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 Analog Interface
      1. 2.1.1 ADC Channel Inputs
        1. 2.1.1.1 High-bandwidth, Fully-Differential Circuit: THS4551
        2. 2.1.1.2 Precision, High-CMRR Circuit: PGA855
      2. 2.1.2 Voltage Reference
    2. 2.2 Power Supplies
      1. 2.2.1 USB Power and When to Power the Board Externally
    3. 2.3 Digital Interface and Clock Inputs
      1. 2.3.1 Digital Interface Connections
      2. 2.3.2 Clock Select
    4. 2.4 ADS9227EVM Quick Start Guide
  9. 3Software
    1. 3.1 ADS9227EVM Software Reference
      1. 3.1.1 ADS9227EVM-GUI Software Installation
      2. 3.1.2 USB Driver Installation
      3. 3.1.3 Using the CONFIG Tab
      4. 3.1.4 Using the Capture Tab
      5. 3.1.5 Using the INL/DNL Tool
      6. 3.1.6 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.     Trademarks
  12. 6Related Documentation

Digital Interface Connections

The ADS9227 uses both SPI and LVDS type interfaces. The SPI is a CMOS interface that is used to configure the internal device registers and consists of SCLK, SDI, SDO, CS, and SPI_EN. For data capture, the ADS9227 uses a source-synchronous LVDS interface. Data for each channel are output on a dedicated differential signal pair (DOUTP/M_A and DOUTP/M_B). In addition, the device outputs both a differential frame clock (FCLKP/M) and data clock (DCLKP/M) back to the host with the conversion data. This type of interface makes sure that propagation delays are consistent between the data output, frame clock, and data clock, improving timing closures at the host. Both the SPI and LVDS interface signals connect to the FMC connector on the EVM. Figure 3-6 provides the FMC connector signal definition. These signals are also available via test points for scope measurements as indicated in PCB silkscreen.

The FMC connector pinout below can also be interfaced with standard FPGA development kits. Note that the TI-provided software GUI is only compatible with the TSWDC155EVM and third-party software development is not supported.

GUID-20240116-SS0I-DWSK-BVTC-6CFWPBJWBRZN-low.svgFigure 2-6 Digital I/O