SBAA395B May   2022  – December 2023 PCMD3140 , TLV320ADC3120 , TLV320ADC3140 , TLV320ADC5120 , TLV320ADC5140 , TLV320ADC6120 , TLV320ADC6140

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Near-Field and Far-Field
    1. 1.1 Definition
  5. 2Constituents in the Far-Field Application
  6. 3Understanding of Digital and Analog Microphone
    1. 3.1 Digital PDM Microphone System
    2. 3.2 Analog Microphone with ADC System
  7. 4Quantization Noise Density for Each Microphone
  8. 5Dynamic Range in Far-Field
    1. 5.1 DR
    2. 5.2 DR in Microphone
    3. 5.3 DRE in the TLV320ADC5140/PCM5140-Q1
    4. 5.4 DRE Performance in TLV320ADC5140/PCM5140-Q1
  9. 6Design of Any Microphone with the TLV320ADC51x0/PCM51x0-Q1
    1. 6.1 Structure of the TLV320ADC51x0/PCM51x0-Q1
      1. 6.1.1 Design Example 1: Only Analog Microphone System
      2. 6.1.2 Design Example 2: Only Digital Microphone System
      3. 6.1.3 Design Example 3: Analog and Digital Microphone Combination System
  10. 7Conclusion
  11. 8Revision History

5.2 DR in Microphone

As shown in Section 5.1 for dynamic range, better SNR, lower THD (Total Harmonic Distortion), and better AOP (Acoustic Overload Point) create high dynamic range. Here, AOP is the point at which the microphone can record the loud sound with distortion as high as 10%. The microphone equivalent input noise (EIN) is used to define microphone SNR to the point at which the microphone no longer effectively projects the difference between the actual sound signal level and microphone self-noise level. It no longer works effectively as a sound pressure sensor at this point.