SLAAEG7 April   2024 TAC5111 , TAC5111-Q1 , TAC5112 , TAC5112-Q1 , TAC5211 , TAC5212 , TAC5212-Q1 , TAD5112 , TAD5112-Q1 , TAD5212 , TAD5212-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Headset Plugs and Connection Diagrams
    1. 1.1 Part I: Pseudo-Differential (Capacitor-less) Headset Output Configuration
      1. 1.1.1 Detection Block, Capacitor-less Interface
      2. 1.1.2 How to Determine the Comparator Threshold V1 and V2 (Capacitor-less Interface)
      3. 1.1.3 How Does the Bias Voltage Vary With Detection Mode?
      4. 1.1.4 Detection Sequence – Capacitor-less Interface
    2. 1.2 Part II: AC-Coupled Stereo Headset Output Configuration – Capacitor Interface
      1. 1.2.1 Detection Block – Capacitor Interface
      2. 1.2.2 How to Determine the Comparator Threshold V1 and V2 – Capacitor Interface
      3. 1.2.3 How Does the Bias Voltage Change With Detection Mode?
      4. 1.2.4 Detection Sequence – Capacitor Interface
  5. 2Example for a Pseudo-Differential (Capacitor-less) Output Configuration
  6. 3Example for an AC-Coupled (Capacitor) Output Configuration
  7. 4Flowchart for Pseudo-Differential (Capacitor-less) Output Configuration
  8. 5Flowchart for AC-Coupled (Capacitor) Output Configuration
  9. 6Summary
  10. 7References

1.1 Part I: Pseudo-Differential (Capacitor-less) Headset Output Configuration

Figure 1-3 shows one configuration of the device that enables detection and determination of headset type when a pseudo-differential (capacitor-less) stereo headphone output connection is used. Note that for best results, it is recommended to select a MICBIAS value as high as possible, and to program the output driver common-mode level at a 1.6-V or 1.5-V level.

GUID-20231122-SS0I-FNDL-SFGV-FPBSW8P7CBMQ-low.gifFigure 1-3 Device With a Pseudo-Differential (Capacitor-less) Headset Output Connection

Figure 1-4 demonstrates the internal circuitry that implements the detection logic. The two comparators in this figure is used for headphone and jack detection.

GUID-20231122-SS0I-359B-J3D0-M0TJS4KC6114-low.gifFigure 1-4 Circuit Diagram of Detection Scheme for Capacitor-less Interface