Premium High-end D/A Converter


Premium High-end D/A Converter

123dB 768kHz/32-bit 2ch Premium High-end D/A Converter


As an upgrade from the best-selling AK4490EQ, which has been adopted by many high-end audio products since the launched in 2014, AKM, has developed the AK4493EQ, a premium high-end D/A converter.  The AK4493EQ uses an improved VELVET SOUND architecture, optimizing the circuit design.  It also employs AKM’s original dedicated audio process.  This process has improved electric margin, low frequency noise performance, and the original acoustic sound expression that can be found in the sound strength and the data amount.

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

Not only in the circuit design, but also the LSI manufacturing process was developed at AKM exclusively for AKM’s audio devices. The AK4493EQ adopts this process, improving low frequency noise performance and electric margin. 32-bit processing is integrated for the IRD, (Impulse Response Designed), filter, reproducing a detailed and natural signal wave. A harmonic sound filter was newly added to the existing five filters found in our previous generation device. So, six different digital filter types are selectable according to the user’s audio and system preferences.

Even Higher Performance than the AKM’s Best Selling DAC, the AK4490

Low-distortion technology achieves -113dB THD+N DAC with a 123dB* S/N characteristic. The AK4493EQ has higher performance than the AK4490. In addition, OSRD, (Over Sampling Ratio Doubler), technology greatly reduces out of band noise. * 126dB in normal mode.

Supporting High Resolution Data

An industry first, a 22.4MHz DSD input is now 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 : 123dB (Mono mode: 126dB)
  • THD+N : -113dB
  • Sound Color Digital Filter : 6 types

Block Diagram


Main Specifications

Part Number AK4493EQ
Premium D/A Converter
Premium D/A Converter
● DR, S/N 123dB 120dB
● THD+N -113dB -112dB
● Sampling Rate 8kHz to 768kHz 30kHz to 768kHz
● DSD Input 22.4MHz 11.2MHz
● Sound Color Filter Six 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
 - Low-dispersion Short Delay
Five 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
● Resolution 32-bit
● Number of channel 2ch
● Output Method Full Differential Output
・Low-distortion technology
・OSRD technology
・Dedicated LSI Process for Premium Audio
・Low-distortion technology
・OSRD technology
● Power Consumption 203mW 145mW
● Power Supply TVDD=AVDD=3.0 to 3.6V (LDO use)
VDDL/R=4.75 to 5.25V
DVDD=AVDD=3.0 to 3.6V
VDDL/R=4.75 to 7.2V
● Operation Temperature -40 to 85°C
● Package 48-pin LQFP (7mm x 7mm)
● Sales Start Jan. 2018 Available Now
● Status RND* -


AK4493EQ Datasheet
English [017012230-E-00]
(104 Pages PDF: 2,001KB)

AKD4493-A EVB Manual
English [KM125201]
(42 Pages PDF: 2,835KB)

AK4493EQ Application Note
English [C013-01]
(16 Pages PDF: 385KB)

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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.