TIDUEV2 October   2025

 

  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
      1. 2.2.1 Differences Between Audio DACs and Precision DACs
      2. 2.2.2 Right-Justified I2S to Daisy-Chained SPI Conversion
    3. 2.3 Highlighted Products
      1. 2.3.1 DAC11001
      2. 2.3.2 OPA1656
      3. 2.3.3 OPA1622
      4. 2.3.4 OPA2828
    4. 2.4 System Design Theory
      1. 2.4.1 Output Glitch
      2. 2.4.2 Sample Rate Dependence in Precision DACs
      3. 2.4.3 System Noise
      4. 2.4.4 DAC11001A vs DAC11001B
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Required External Power Supplies
      2. 3.1.2 Jumper Definitions
      3. 3.1.3 Selecting I2S Source
        1. 3.1.3.1 USB I2S Source
        2. 3.1.3.2 SPDIF I2S Source
        3. 3.1.3.3 External PSIA I2S Source
    2. 3.2 Software Requirements
      1. 3.2.1 Installing the XMOS USB 2.0 Driver
      2. 3.2.2 Setting USB Sample Rate
    3. 3.3 Testing and Results
      1. 3.3.1 Measuring Total Harmonic Distortion and Noise
      2. 3.3.2 THD and THD+N Results
      3. 3.3.3 Measuring Dynamic Range
      4. 3.3.4 Dynamic Range Results
      5. 3.3.5 Measuring Signal-to-Noise Ratio
      6. 3.3.6 SNR Results
  10. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  11. 5Related Documentation
    1. 5.1 Support Resources
    2. 5.2 Trademarks
  12. 6About the Author

3.1.1 Required External Power Supplies

The TIDA-060031 requires two power supply sources. The left side of the design primarily features support circuitry for the digital input and USB interface. Figure 3-1 shows that the circuitry can be supplied by the USB input or from the external supplies through the power bridge.

The right side of the board features the critical analog circuitry, specifically the DAC, DAC reference and reference buffers, and the DAC output buffers. This side also features some digital control circuitry used to manage the SPI data-path and to convert the incoming RJ I2S data to a daisy-chained SPI format. This side of the board requires external power.

TIDA-060031 Power Supply Configuration Figure 3-1 Power Supply Configuration

Figure 3-1 shows the power inputs for the TIDA-060031 design. The terminal block, J30, is used for an external supply for the key circuitry. Table 3-1 shows the J30 definitions.

Table 3-1 Power Supply Inputs
J30 PIN DESCRIPTION VALUE AND LIMITS
J30.1 Low-voltage supply +6V. This supply is used for the 5V analog, 5V digital, and 3.3V digital supplies for the key circuitry. +6V input, 300mA limit
J30.2 Ground Ground
J30.3 Positive high-voltage supply input. This is used for the +12V supply for the key circuitry. +12.5 to +15V, 200mA limit
J30.4 Ground Ground
J30.5 Negative high-voltage supply input. This is used for the –12V supply for the key circuitry. –12.5V to –15V, 200mA limit

If the USB input is not being used (I2S is provided by the S/PDIF input or connected directly to the design), then the USB supply is not needed. The +3.3V supply from the key circuitry side can be used to power the minimal support circuitry from the left side of the board. This can be accomplished by connecting the 3.3V supply on the power bridge (J29, position 1-2).