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

Abstract

The analog front end module (ADC) of the TAX5XXX devices (TAC5212, TAC5211, TAA5212, TAC5412, TAC5411, TAA5412, TAA5242, TAC5242) is designed in a new architecture with 118dB Dynamic Range performance in the AC-Coupled differential input configuration. There are other device variants (TAC5112, TAC5111, TAC5312, TAC5311, TAC5142) which incorporated the same architecture with standard performance of 100dB Dynamic Range. These Dynamic Range performances are with A-weighted filter.

In this new architecture, the commonly known Programmable Gain Amplifier (PGA) is now integrated into the ADC module. The PGA gain amplification is no longer available and when additional gain is needed, the gain is applied in the digital through the Digital Volume (DVOL) register.

This application notes addresses the following questions by comparing two different architectures:

  1. Can the lowest signal of a condenser microphone such as ECM be captured by the TAX5XXX front end without additional external amplification?
  2. Are the performances affected in the new architecture without PGA?