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Home > Audio Amplifiers
PA3138 Datasheet






The UTC PA3138 is a pop-free stereo headphone amplifier with

the integrated charge pump generating the negative supply rail

which allows the removal of the output DC-blocking capacitors. The

UTC  PA3138 provides a clean, pop-free ground-biased audio

signal. The UTC PA3138 is capable of driving 25mW into a 32-Ω

load with 3.3-V supply voltage.  The device has differential inputs

and uses external resistors for flexible gain setting. 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.  

The UTC PA3138 has built-in active-mute control for pop-free

audio on/off control. The UTC  PA3138 has an external

under-voltage detector that mutes the output when monitored

voltage drop below set value.

Using the UTC  PA3138 in audio products can reduce

component count considerably compared to traditional headphone


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