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 TIs 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
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.
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