Low-Power Advanced 32-bit Stereo DAC with HP-Amp / SRC
Low-power HiFi Headphone DAC for Bluetooth headphones
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. It is ideal for Bluetooth headphones.
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.
|DAC|| 32-bit Stereo Portable
Audio D/A Converter
| 32-bit Mono Portable
Audio D/A Converter
|Sound Color|| Four Types of Digital Filters
- Acoustic Sound (Short Delay Sharp Roll-off, GD = 5.5/fs)
- Acoustic Tone (Short Delay Slow Roll-off, GD = 4.5/fs)
- Traditional Sound (Sharp Roll-off)
- Traditional Tone (Slow Roll-off)
|Headphone Amplifier|| Ground Referenced Class-G Headphone Amplifier
- Output Noise Level: -114dBV (Analog Volume = -10dB)
- Analog Volume: +4 to -10dB, 2dB Step
|Output Power: 70mW with 8Ω||Output Power: 88mW with 8Ω|
|THD+N (Total Harmonic Distortion Pulse Noise)||-100dB||-101dB|
|Sampling Rate||Maximum 192kHz Master/Slave Mode|
|Jitter Cleaning Function|| Available
Asynchronous Sample Rate Converter
|Low Jitter PLL||Available|
|Digital MIC Interface||Available||None|
|Digital Audio Interface||PCM Input|| PCM Input
PDM 1-bit Input
|Number of Channels||2ch||1ch|
|Microcontroller Interface||I2C (400kHz)|
|VELVET SOUND Technology|| Low distortion Technology
OSRD (Over Sampling Ratio Doubler) Technology
|Power Consumption||4.4mW (fs = 48kHz)||2.8mW (fs = 48kHz)|
|Power Supply|| AVDD = CVDD = LVDD = 1.7 to 1.9V
TVDD = 1.65 to 3.6V
|AVDD = CVDD = LVDD = 1.7 to 1.9V|
|Operation Temperature Range||-40 to 85°C|
|Package|| 36-pin CSP
(2.533 × 2.371mm, 0.4mm pitch)
| 30-pin CSP
(2.371 × 1.971mm, 0.4mm pitch)
|Mass Production||Now||Summer, 2019|
About VELVET SOUND
VELVET SOUND is a sound philosophy and brand concept for AKM’s next-generation audio devices, featuring new chip architectures and core technologies.
The new circuitry found in VELVET SOUND devices is designed to maximize dynamics and ensure pure, unaltered audio data, prioritizing the accurate capture and reproduction of the source material in order to achieve high performance and rich musicality. These devices were designed specifically for the high-resolution digital audio era.
*VELVET SOUND Logo™, Audio 4 Pro™ and Audio 2 Go™ are trademarks of Asahi Kasei Electronics Corporation in Japan, Europe and the United States.
by ASAHI KASEI MICRODEVICES