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PA3138 - DIRECT HEADPHONE DRIVER

General Description

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.

Key Features

  • Low THD+N90dB.
  • Ground-Referenced Outputs Eliminate DC-Blocking Capacitors.
  • Differential Input and Single-Ended Output.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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UNISONIC TECHNOLOGIES CO., LTD PA3138 DIRECT HEADPHONE DRIVER WITH ADJUSTABLE GAIN CMOS IC  DESCRIPTION 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.