SDAA293 February   2026 TAC5111-Q1 , TAC5112-Q1 , TAC5311-Q1 , TAC5312-Q1 , TAC5412-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Detailed Description
    1. 2.1 Analog Input Hardware Design
      1. 2.1.1 Selection of External Bias Resistor
      2. 2.1.2 Selection of Coupling Capacitor
    2. 2.2 Analog Output Hardware Design
      1. 2.2.1 Selection of Output Coupling Capacitor
      2. 2.2.2 Output Capacitor Summary
      3. 2.2.3 How to Select ESD for Audio Ports
    3. 2.3 AC-Coupled and DC-Coupled
      1. 2.3.1 AC-Coupled Systems
      2. 2.3.2 DC-Coupled Systems
    4. 2.4 TAC5212 and TAC5112-Q1 Headset Detection Design
      1. 2.4.1 How to Implement Headset Detection
        1. 2.4.1.1 Headset Detection in AC-Coupled Output Mode
        2. 2.4.1.2 Headset Detection in DC-Coupled Output Mode
      2. 2.4.2 Debounce and Detection Real-Time Performance of Headset Detection
      3. 2.4.3 TAC5X1X-Q1 Family Other Advanced Features
  6. 3Summary
    1. 3.1 Configuration Example
  7. 4References

2.4.1.2 Headset Detection in DC-Coupled Output Mode

Circuit Diagram of Detection Scheme for DC-Coupled Output Mode Figure 2-15 Circuit Diagram of Detection Scheme for DC-Coupled Output Mode
Headset Detection Schematic Design in Pseudo-Differential mode Figure 2-16 Headset Detection Schematic Design in Pseudo-Differential mode

For the pseudo-differential output DAC connection configuration, the headset insertion detection function of TAC5212 & TAC5112-Q1 is implemented by monitoring the voltage changes on the MICDET pin and HPSNS (i.e., OUT2M pin) to identify the insertion status and specific type of the headset. It should be noted that the corresponding relationships of each pin are as follows: MICDET=IN2M, HPSNS=OUT2M, HPROUT=OUT1P, HPLOUT=OUT2P, HPCOM=OUT1M. Use differential/pseudo-differential drive (OUTxP / OUTxM both driven): no series caps needed; best for headphones and keeps bass.

Detection Sequence – Capacitor-less Interface

Enable headset detection scheme and set DC-Coupled (Page 1, Reg 0x1A)

Table 2-2 Principle of Headset Detection in DC-Coupled Output Mode
MICDET Voltage Headset Detection Result
MICDET < V2 Insertion detected
MICDET > V2 No insertion
MICDET > V1 Headset with mic
MICDET < V1 Headset without mic
Given headset with mic is already detected
MICDET > V3 No button press
MICDET < V3 Button press detected

V2=(MICBIAS-ref)*(22/25)+ref, V1=(MICBIAS-ref)*(11/100)+ref, and V3=MICBIAS*(11/100)+ref, where ref = HPSNS = Output common-mode voltage.