TPA6138A2 (ACTIVE)

DIRECTPATH™ Headphone Driver with Adjustable Gain

DIRECTPATH™ Headphone Driver with Adjustable Gain - TPA6138A2
 

Description

The TPA6138A2 is a pop-free stereo headphone amplifier designed to allow the removal of the output dc-blocking capacitors for reduced component count and cost. The device is ideal for single-supply electronics where size and cost are critical design parameters.

Designed using TI’s patented DirectPath™ technology, The TPA6138A2 is capable of driving 25 mW into a 32-Ω load with 3.3-V supply voltage. The device has differential inputs and uses external gain-setting resistors that supports a gain range of ±1 V/V to ±10 V/V. Gain can be configured individually for each channel. The device can also be configured as a second-order low-pass filter and is ideal for interfacing with PWM audio sources. Audio output compiles with ±8-kV IEC ESD protection, requiring just a simple resistor-capacitor ESD protection circuit. The TPA6138A2 has built-in active-mute control for pop-free audio on/off control. The TPA6138A2 has an external undervoltage detector that mutes the output when the power supply is removed, ensuring a pop-free shutdown.

Using the TPA6138A2 in audio products can reduce component count considerably compared to traditional headphone amplifiers. The TPA6138A2 does not require a split-rail power supply or a dc blocking capacitor. The TPA6138A2 integrates its own charge pump to generate a negative supply rail that provides a clean, pop-free ground-biased audio signal.

The TPA6138A2 is available in a 14-pin TSSOP.

Features

  • Stereo DirectPath™ Headphone Amplifier
    • 40 mW Into 32 Ω With 3.3-V Supply
  • Low THD+N < 0.01% at 10 mW Into 32 Ω
  • High SNR, >90 dB
  • Differential Input and Single-Ended Output
  • Adjustable Gain by External Gain-Setting
    Resistors
  • Configurable as a Second-Order Low-Pass Filter
    • Ideal for PWM Audio Sources
  • Low DC Offset, <1 mV
  • Ground-Referenced Outputs Eliminate DC-
    Blocking Capacitors
    • Reduce Board Area
    • Reduce Component Cost
    • Improve THD+N Performance
    • No Degradation of Low-Frequency Response
      Due to Output Capacitors
  • Short-Circuit Protection
  • Click- and Pop-Reduction Circuitry
  • External Undervoltage Mute
  • Active Mute Control for Pop-Free Audio On/Off
    Control
  • Space-Saving TSSOP Package

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Parametrics Compare all products in Headphone Amps

 
Output Power (W)
Analog Supply (V) (Min)
Analog Supply (V) (Max)
PSRR (dB)
Rating
Operating Temperature Range (C)
Headphone Channels
Volume Control
Shutdown Current (ISD) (uA)
Architecture
Iq per channel (Typ) (mA)
TPA6138A2 TPA6130A2 TPA6132A2 TPA6133A2 TPA6136A2 TPA6140A2 TPA6141A2 TPA6166A2
0.25    0.138    0.025    0.138    0.025    0.025    0.025    0.03   
3.6    2.5    2.3    2.5    5.5    2.5    2.5    1.7   
3.6    5.5    5.5    5.5    2.3    5.5    5.5    1.9   
80    109    100    109    100    105    105    92   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85   
Stereo    Stereo    Stereo    Stereo    Stereo    Stereo    Stereo    Stereo   
No    Yes    No    No    No    Yes    No    Yes   
1    0.4    0.7    0.08    0.7    1    1    1   
Class-AB    Class-AB    Class-AB    Class-AB    Class-AB    Class-G    Class-G    Class-G   
14    2    1.05    4.2    1.05    0.6    0.6    1.2