TIDUC09 June   2026 BUF802

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 System Design Theory
      1. 2.3.1 Analog Front-End
        1. 2.3.1.1 Input Buffer Amplifier
        2. 2.3.1.2 Variable Gain Amplifier
        3. 2.3.1.3 ADC Driver with LMH6552
        4. 2.3.1.4 Analog PI Filter
        5. 2.3.1.5 Digital Potentiometer
      2. 2.3.2 System Dynamic Range
    4. 2.4 Highlighted Products
      1. 2.4.1 BUF802
      2. 2.4.2 LMH6518
      3. 2.4.3 DAC80508
      4. 2.4.4 TLV3605
      5. 2.4.5 TPL0102
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
      1. 3.2.1 ADC Configuration
      2. 3.2.2 AFE Hardware Setup & Configuration
        1. 3.2.2.1 Device Programming
    3. 3.3 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  11. 5About the Author

3.2.2 AFE Hardware Setup & Configuration

The TIDA-010133 reference design hardware has a few user selectable hardware configurations available to the user via jumpers headers. The jumpers primarily configure the programmability of the hardware. This includes the option to communicate with the hardware with either an onboard FTDI device or through SPI/I2C with a USB2ANY module. The following table shows the onboard devices and the communication interface used to communicate with each device.

Table 3-1 Device Interface
DeviceCommunication Interface
LMH6518SPI
DAC80508SPI
TPL0102I2C

There are 7 jumper headers; 3 for the LMH6518, 2 for the DAC80508, 2 for the I2C TMUX121 interface.

The LMH6518 uses jumpers J18, J19, and J24 for it's configuration. J18 is used to select which channel device (1 or 2) to communicate with when using the USB2ANY. J19 is used to switch the interface between the FTDI and USB2ANY. J24 is used to enable or disable the mutiplexer used for the switching between FTDI and USB2ANY, the multiplexer enable pin is active low.

Table 3-2 LMH6518 Configuration
J18J19J24Programming
x00FTDI
010Channel 1 (USB2ANY)
110Channel 2 (USB2ANY)
XX1Disabled

The DAC80508 uses J25 and J27 for the configuration. J25 is to switch between the FTDI and USB2ANY communication interface. J27 is used to enable or disable the second multiplexer for the DAC.

Table 3-3 DAC80508 Configuration
J25J27Programming
00FTDI
10USB2ANY
X1Disabled

J31 is used to select I2C interface from FTDI or USB2ANY and J32 is to enable/disable the Multiplexer.

Table 3-4 I2C Source Selection
J31J32Programming
00FTDI
10USB2ANY
X1Disabled

J17 is used to provide the FTDI device a 3.3V input. The two available options are either from the onboard 3.3V power rail or from the USB VBUS.

Table 3-5 FTDI 3P3V Supply Source
J17VREGIN Source
1-2+3P3VD Power Rail
2-3VBUS from connected USB

To power up the board, it requires a 12V, 500mA supply at J5 with ground connected at J30. The USB2ANY ribbon cable is connected on J16 header with pin 1 (red strip) facing bottom left. Once the power is provided the green LED will light up as shown in the figure below.

TIDA-010133 AFE Board SetupFigure 3-6 AFE Board Setup.