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

5.4 DRE Performance in TLV320ADC5140/PCM5140-Q1

Figure 5-2 and Figure 5-3 show the THD+N measurement results with and without DRE. The measurement graph with DRE enabled (DRE threshold set to -36 dB) shows DR improvement of 12 dB and it also improves the record distance and sensitivity by four times.

GUID-33851409-A800-4EB9-8A1A-A7BFAD5C10BB-low.gifFigure 5-2 THD+N Performance Measurement with DRE Enabled
GUID-E0BF034B-08B6-4412-8BAF-3409E03249C5-low.gifFigure 5-3 THD+N Performance Measurement with DRE Disabled