Premium High-end D/A Converter


Premium High-end D/A Converter

128dB 768kHz/32-bit 2ch Premium High-end D/A Converter


The AK4497 is a new generation premium 32-bit DAC based on AKM’s VELVET SOUND architecture that has been widely adopted by well-established high-end audio companies. High signal to noise performance is achieved by improving VELVET SOUND technology by supporting a larger current drive capability. The performance of an audio DAC using switched capacitor is expanded to the limit with the AK4497.

In addition, AKM has developed an original process that has greatly improved low noise performance and electric margin for audio devices, increasing data amount and enhancing original acoustic sound that can be found in the sound strength.

Dynamic Sound Playback with Large Amount of Playback Information: VELVET SOUND architecture is improved

Not only circuit designing but also the LSI manufacturing process was newly developed at AKM exclusively for AKM’s audio devices. The AK4497 is the first device to utilize this process in AKMs foundry.
32-bit processing is integrated for the IRD (Impulse Response Designed) Filter, reproducing a detailed and natural signal wave. A low-dispersion short delay filter was newly added to the other five filters found in our previous generation device. So, six different digital filter types are selectable according to the user audio and system preferences.

AKM’s Best Performance D/A Converter

Low-distortion technology achieves industry’s best performance of -116dB THD+N DAC with 128dB S/N characteristic.
The AK4497 has the best performance among AKM’s D/A converters. In addition, OSRD (Over Sampling Ratio Doubler) technology greatly reduces out of band noise.

Supporting High Resolution Data

The first in the industry, a 22.4MHz DSD input is supported. The digital input supports up to 768 kHz PCM and 22.4 MHz DSD (Direct Stream Digital), recreating high-resolution sound that is as close as possible to the original acoustic source.


High-end Audio, Professional Audio, AV Receivers, CD/SACD Players, Network Audio, USB DAC’s, USB Headphones, Sound Plates, Sound Bars, PA Equipment, Bluetooth Headphones, HD Audio, Voice Conference Equipment, IC Recorders, Measurement Instruments, Control Systems

Key Features

  • Maximum Sampling Frequency, Bit rate : PCM 768kHz/32-bit, DSD 22.4MHz
  • SNR : 128dB (Mono mode: 131dB)
  • THD+N : -116dB
  • Sound Color Digital Filter : 6 types

Block Diagram


Main Specifications

Part Number
AK4499EQ AK4497EQ
Number of Channels  4ch 2ch
Output architecture  Current Voltage
Resolution  32-bit 32-bit
THD+N  -124dB -116dB
DR, S/N 134dB
140dB (Mono Mode)
131dB (Mono Mode)
Sampling Rate  8 to 768kHz 8 to 768kHz
DSD Input  22.4MHz 22.4MHz
Low Distortion Technology Yes Yes
LSI Process for Audio Yes Yes
Non-Magnetic Pkg Yes Yes
“Sound Color” Digital Filters  6 types 6 types
Power Consumption  667mW 346mW
Power Supply Analog : 4.75 to 5.25V
Digital : 1.7 to 3.6V
Analog : 4.75 to 5.25V
Digital : 1.7 to 3.6V
Operation Temperature Range -40 to +85°C -40 to +85°C
Package 128-pin HTQFP 64-pin TQFP


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 ™, VELVET SOUND | VERITA ™ and Audio 4 Pro ™ are trademarks of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.