News Release

- New Product Information -

AKM releases an ultra-low power HiFi D/A converter for Bluetooth headphones

Product Name
Product Category:
Audio > Audio D/A Converter
32-bit Stereo D/A Converter with Headphone Amplifier
THD+N: -100dB, SNR: 109dB
Sampling Rate: 8 to 192kHz
Bluetooth Headphones


As more consumers switch to wireless Bluetooth headphones, high-resolution audio transmission technology improves. With this trend, Asahi Kasei Microdevices Corporation, (AKM), has released the AK4331, a 32-bit stereo D/A converter, (DAC), with built-in headphone amplifier. It achieves high quality sound with low power consumption and long playback time. It uses half the power of the AK4375A, (released in 2014), which has been widely adopted in portable audio.


● Achieving THD+N = -100dB with 4.4mW ultra-low power

VELVET SOUND technology adopted for premium D/A converters for high-end audio equipment has been further optimized for portable devices. Newly developed low-power consumption technology has been implemented. Each circuit block such as the headphone amplifier or LDO maintains sound quality while reducing power consumption. The AK4331 achieves 4.4mW ultra-low power consumption, THD+N at -100dB, and 109dB SNR. Long playback time with Bluetooth headphones can be achieved.

● Necessary headphone functions integrated in a small package

The AK4331 integrates necessary functions such as a headphone amplifier, digital microphone input, and LDO, into a compact 36-pin CSP package. A jitter cleaner, (sample rate converter), which is effective under a jittery clock input environment is also included.

Main Specifications

Advanced D/A Converter with Headphone Amplifier
DAC Advanced 32-bit Stereo Audio D/A Converter
   4 types of Digital Filter for Sound Color Selection
Headphone Amplifier Ground-referenced Class-G Stereo Headphone Amplifier
   THD+N: -100dB
   SNR: 109dB
Sampling Rate 8 to 192kHz
Jitter Cleaner Available (with Asynchronous Sample Rate Converter / Crystal Oscillator / Low Jitter PLL)
Digital Microphone Interface Available
Microcomputer Interface I2C (400kHz)
Power Consumption 4.4mW (fs=48kHz)
Power Supply  AVDD = CVDD = LVDD = 1.7 to 1.9V
 TVDD = 1.65 to 3.6V
Operation Temperature Range -40 to 85°C
Package 36-pin CSP (2.533 × 2.371mm, 0.4mm pitch)
* Information on this page is current on the date of press release.
* AKM、VELVET SOUND™ are trademarks of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.
* Appellations, company names and product names on this page are trademarks or registered trademarks of respective companies.

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