News Release

- New Product Information -

2014/05/01 (updated 2014/12/22)
AK4490: High Sound Quality Premium 32-bit Stereo DAC

Product Name
(Product: Audio > Premium Audio > Premium DACs)
32-bit Stereo Premium D/A Converter
High-end Audios, Professional Audios
VELVET SOUND Premium Audio Devices VERITA Audio 4 Pro


Asahi Kasei Microdevices Corporation (AKM) today launched the AK4490, a high performance 32-bit stereo DAC that achieves industry leading level performance of THD+N (-112dB) for a voltage output with 120dB dynamic range. It is a member of the Audio 4 ProTM family that adopts a newly developed VELVET SOUNDTM technology and is the flagship product of a new generation 32-bit premium DAC called VERITA series. The AK4490 integrates a newly developed switched capacitor filter “OSR Doubler” that greatly reduces sound degradation from noise shaping, achieving a flat noise floor up to 200kHz. An innovative design technique utilizing a symmetrical layout for the left and right channels prevents signal quality deterioration, and a 32-bit digital operation block provides full 32-bit processing.


The AK4490 achieves rich sound field and bass representation that realizes a music playback experience with less distortion with this newly developed circuit. As a sound quality consideration, the VDD, VREFH, VSS and VREFL pins are separated for each L and R channels. In addition each L and R channel has two pins to avoid common impedance effects and to optimize low impedance performance as much as possible.

Five digital filters are integrated into the AK4490: a short delay, sharp roll-off filter and a short delay, slow roll-off filter for minimum delay, a sharp roll-off filter and a slow roll-off filter for no phase shifting, and newly integrated super slow roll-off filter with emphasized characteristics provide a wide range of choice in digital filters.

The AK4490 supports 2.8MHz, 5.6MHz and 11.2MHz DSD (Direct Stream Digital) input, and PCM data input. It is capable of switching output data between DSD and PCM. Volume pass mode bypasses the volume control block and the delta sigma modulator when play back DSD data. It is suitable for applications which have most priority to the sound quality. Since the AK4490 contains an integrated low-pass filter only for DSD data, the required performance in the SACD format book (Scarlet Book) can be easily realized with a simple external analog filter. The output level is the same for either PCM or DSD input data, as well as for external digital filter input. Volume control is independent of the input data format.


Premium D/A Converter
DR, S/N120dB (Mono mode: 123dB)
Sampling Rate30kHz to 768kHz
DSD Input2.8MHz, 5.6MHz, 11.2MHz
Sound ColorFive Types, 32-bit 8-fold Digital Filters
- Short Delay Sharp Roll-off, GD=6.25/fs
- Short Delay Slow Roll-off, GD=5.3/fs
- Sharp Roll-off
- Slow Roll-off
- Super Slow Roll-off
Number of Channel2ch
Low-distortion technology
OSRD (Over Sampling Ratio Doubler) technology
Power Consumption145mW
Power SupplyAnalog: 4.75 to 5.25V
Digital: 3.0 to 3.6V
Operation Temperature-40 to 85°C
Package48-pin LQFP (7mm x 7mm)

Evaluation boards and samples are available now.

To obtain more information about the AK4490, please visit here.


VELVET SOUND is a brand concept of, “sound philosophy”, given to AKM’s new generation of audio devices and, “new architecture & core technologies”. A new circuit is designed to, “balance the amount of information and intensity”, and, “focus on the original sound”, to achieve rich musicality and high performance. This circuit contains specifications and features suitable for the high-resolution audio era.

Audio 4 Pro
About "Audio 4 Pro"

Audio 4 Pro™ products are designed for pro audio equipment, including mixing consoles, electronic musical instruments and sound effectors, meeting the highest sound quality standards of recording studios. Audio 4 Pro™ products range provides world-leading performance with high quality sound, winning trust within professional audio industry.

* Information on this page is current on the date of press release.
* AKM, VELVET SOUND Logo™ and Audio 4 Pro™ are trademarks of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.

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