Low-Power Advanced 32-bit Stereo DAC with HP-Amp / SRC

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The AK4331 is an advanced 32-bit high sound quality stereo audio DAC with a built-in ground-referenced headphone amplifier. The AK4331 has four types of 32-bit digital filters for better sound quality, achieving low distortion characteristics and wide dynamic range. The AK4331 also has a jitter cleaner with a built-in SRC and a Crystal. The AK4331 is available in a 36-pin CSP package, utilizing less board space than competitive offerings.


● 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.

● Application

Bluetooth Headphones, USB Headphones, Portable Music Players, etc.

Key Features

Product NameAK4331ECB  AK4331ECB
  Advanced D/A Converter with Headphone Amplifier
DAC Advanced 32-bit Stereo Audio D/A Converter
    Sound Color 4 Types, 32-bit 8-fold Digital Filters
  - Short Delay Sharp Roll-off, GD=5.5/fs
  - Short Delay Slow Roll-off, GD=4.5/fs
  - Sharp Roll-off
  - Slow Roll-off
Headphone Amplifier Ground Referenced Class-G Stereo Headphone Amplifier
  - Output Power: 70mW @ 8Ω
  - Output Noise Level: -114dBV (Analog Volume = -10dB)
  - Analog Volume: +4 to -10dB, 2dB Step
  - Ground Loop Noise Canceling
    SNR 109dB
Sampling Rate 8kHz to 192kHz
  Master/Slave Mode
Jitter Cleaner Available (with Asynchronous Sample Rate Converter / Crystal Oscillator / Low Jitter PLL)
Digital Microphone Interface Available (Stereo)
Resolution 32-bit
Number of Channel 2 channels
Microcomputer Interface I2C (400kHz)
 Low-distortion Technology
 OSRD (Over Sampling Ratio Doubler) Technology
Power Consumption 4.4mW (fs=48kHz)
Power Supply  AVDD = CVDD = LVDD = 1.7 to 1.9V
 TVDD = 1.65 to 3.6V
Operation Temperature -40 to 85°C
Package 36-pin CSP (2.533 × 2.371mm, 0.4mm pitch)
Sales Start September 2018

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