SCDS488 December   2025 TMUX2819 , TMUX2821

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Thermal Information
    4. 5.4 Recommended Operating Conditions
    5. 5.5 Source or Drain Continuous Current
    6. 5.6 Source or Drain RMS Current
    7. 5.7 Electrical Characteristics
    8. 5.8 Switching Characteristics
    9. 5.9 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1  On-Resistance
    2. 6.2  On-Leakage Current
    3. 6.3  Off-Leakage Current
    4. 6.4  Power-Off Leakage Current
    5. 6.5  Propagation Delay
    6. 6.6  tON (VDD) and tOFF (VDD) Time
    7. 6.7  Transition Time
    8. 6.8  Break-Before-Make
    9. 6.9  THD + Noise
    10. 6.10 Power Supply Rejection Ratio (PSRR)
    11. 6.11 Charge Injection
    12. 6.12 Bandwidth
    13. 6.13 Off Isolation
    14. 6.14 Crosstalk
  8. 7 Detailed Description
    1. 7.1 Functional Block Diagram
    2. 7.2 Device Functional Modes
    3. 7.3 Feature Description
      1. 7.3.1 Beyond the Supply
      2. 7.3.2 Bidirectional Operation
      3. 7.3.3 Power-Off Protection
      4. 7.3.4 1.2V and 1.8V Logic Compatible Inputs
      5. 7.3.5 Integrated Pull-Down Resistor on Logic Pins
      6. 7.3.6 Fail-Safe Logic
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Audio Input or Output Switching
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

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8.2.1 Audio Input or Output Switching

When there are multiple audio inputs available such as a line-in and a wireless connection, a switch/multiplexer is needed to switch between audio sources. This same scheme can be used in systems where there are multiple speaker outputs and one source as well. A TMUX2819 can be used for all of these use cases, easily supporting line-in audio up to ±5.5V with a supply/battery voltage from 1.8V to 5.5V. Figure 8-1 shows the block diagram for these applications. Additionally, if IEC protection is needed on the external connectors (audio jack input or external speaker), 2 TPD1E10B06 can be used.

The TMUX2819 features excellent THD+N performance, so there is minimal impact to the audio signal quality through the switch. This allows the system designer to save a significant portion of board area without impacting signal integrity. Additionally, because of the low supply current requirement, the device's supply can be driven directly with a GPIO, allowing the user to put the device into a ultra-low power mode. In this mode the TMUX2819 operates with powered-off protection, so any high voltage present on the inputs will not propagate to the outputs. This helps keep correct power up cycling and increases system robustness.

TMUX2821 TMUX2819 Audio Headphone and Speaker Output Switching Figure 8-1 Audio Headphone and Speaker Output Switching
TMUX2821 TMUX2819 Hearing Aid Telecoil MUX Figure 8-2 Hearing Aid Telecoil MUX