SLLA641 July   2024 TAA5212 , TAC5112 , TAC5212

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2ADC Front End Block Diagram
  6. 3Application Example
    1. 3.1 MIC 1: POM-2242P-C33-R Microphone
      1. 3.1.1 Test Case 1: Microphone Minimum Input Level
      2. 3.1.2 Test Case 2: Microphone Maximum Input Level
      3. 3.1.3 Test Case 3: Microphone Maximum Input Level with Gain
    2. 3.2 MIC 2: POM-2730L-HD-R Microphone
      1. 3.2.1 Test Case 1: Microphone Minimum Input Level
      2. 3.2.2 Test Case 2: Microphone Maximum Input Level
      3. 3.2.3 Test Case 3: Microphone Maximum Input Level with Gain
  7. 4Summary
  8. 5References

3 Application Example

The following are two different Microphones used in this application examples; POM-2242P-C33-R and POM-2730L-HD-R. Using the microphone information from the data sheet, tests are run on converter devices that has PGA and TAX5XXX converter which has the new ADC front-end architecture.

In each of the microphone case, the following test conditions were run:

  • From the smallest input signal level the microphone is able to capture, use an instrument like Audio Precision AP555 to generate a tone of that level and analyze the digital signal output from the converter.
  • From the largest input signal (AOP) the microphone is able to capture, use an instrument like Audio Precision AP555 to generate a tone of that level and analyze the digital signal output from the converter.
  • From the AOP of the microphone, add the necessary gain in the converter to achieve the converter input full-scale level. The gain is added up to -1dBr of the full-scale per the converter THDN specification.

From each of the test cases above, the performance is compared between the 2 converter devices.

The device we use with PGA integrated is TLV320ADC6120; a high performance audio analog-to-digital converter (ADC) with 123dB Dynamic Range with DRE enable and 113dB with DRE disabled in the AC-Coupled differential input and TAA5212; a low-power high-performance stereo audio ADC with 118dB dynamic range in the new ADC front-end architecture.