New Product - Premium Audio -

2016/04/19 (updated 2016/07/19)

Bringing ultimate sound quality to portable applications, the AK4490EN and its dedicated clock generator, AK8157A, are now available

VELVET SOUND Premium Audio Devices VERITA Audio4pro
Product Name VERITA AK4490EN
(Product: Audio & Voice > Audio Components > Premium DACs)

Title 32-bit Stereo Premium D/A Converter
DR,S/N: 120dB  THD+N: -112dB Sampling Rate: Max: 768kHz  DSD: 11.2MHz

Product Name AK8157A
(Product: Clock & Timing & more> Clock & Timing> Clock Generators)

Title Dedicated Clock Generator for 32-bit Stereo Premium D/A Converter External Clock Input: 9.6MHz Output Frequency: 3 frequency selectable

Applications Portable Audio (Smartphones, Tablets, Portable Music Players)


The market is demanding premium sound quality solutions for smartphones and portable music players due to the growing availability of high-resolution sound sources. Asahi Kasei Microdevices Corporation (AKM) launched the AK4490EN, a 32-bit premium D/A converter that adopts VELVET SOUND (TM) technology.
The AK4490EN inherits high quality sound technologies of the AK4490EQ that has been adopted by many audio products since it was launched in 2014. Downsizing the package and supporting a 1.8 V digital interface, the AK4490 is ideal for portable applications. It supports high resolution sound sources as a digital input and up to 768 kHz PCM and 11.2 MHz DSD (Direct Stream Digital) data.
To help simplify the system clocking solution and maintain audio performance, the sampling rate clock source can be switched between 44.1 kHz and 48 kHz multiples by using the AK8157A as a clock interface.  This solves the complex clock routing and sourcing issues found in today’s portable devices.

● Optimized for Portable Applications

The AK4490EN is the first device with a QFN package (6mm□) in VERITA series, drastically downsized from the AK4490EQ (9mm□ w/ lead frame).
It supports a 1.8 V digital interface in addition to conventional 3.3 V digital interface, corresponding to various systems including portable applications.

● The AK8157A, A Dedicated Clock Generator for Premium D/A Converters, Is Also Released

The AK8157A is a multi-clock generator for audio products generating low phase noise MCLK/RSCI/BICK that are necessary for the AK4490EN to achieve the maximum performance of -112dB THD+N.

● High Quality Sound Equal to The AK4490EQ with “VELVET SOUND (TM)” Technology

The AK4490EN achieves -112 dB THD+N, the top level performance in the 120dB S/N class of DAC. This DAC reduces sound quality degradation caused by noise shaping realizing a flat noise floor up to 200 kHz with AKM’s original switched capacitor filter and OSR Doubler technology. In addition, 32-bit processing and L/R symmetrical layout also optimized for sound quality.
Five different 32-bit digital filter types are available: Short delay sharp roll-off and short delay slow roll-off filters have overall short delay characteristics. Sharp roll-off filter and slow roll-off filter preserve the phase difference and a new filter that has even slower roll-off character was added to these four filters. They are selectable according to the user audio and system preferences.

Dedicated Clock Generator AK8157A


AK4490EN AK4490EN
 Premium D/A Converter

 DR, S/N  120dB (Mono mode: 123dB)
 THD+N  -112dB
 Sampling Rate  30kHz to 768kHz
 DSD Input  2.8MHz, 5.6MHz, 11.2MHz
 Sound Color  5 types 32-bit 8-fold Digital Filter
 Low Distortion Full Differential Output
 Power Consumption
 Power Supply  Analog: 4.75 to 5.25V
 Digital: 1.6 to 3.6V
 Operation Temperature  -40 to 85°C
 Package  48-pin QFN, 6 x 6 mm

>> To obtain more information about AK4490EN, please visit here.

AK8157A AK8157A
 Dedicated Clock Generator

 External Clock Input Frequency
 Clock Frequency
 3 frequency selectable outputs
 Sampling Rate  - MCLK: 16.384, 22.5792, 24.576MHz
 - BCLK: 2.048MHz to 24.576MHz
 - LRCK: 32kHz to 384kHz

 Clock Output
 Enable / Disable control
 Low Jitter  RMS Jitter: 45ps (10Hz to 5MHz)
 Power Consumption
 Power Supply  VDD1-4: 1.7 to 2.0V
 Operation Temperature  -40 to 85°C
 16-pin WLCSP, 1.55 x 1.55 mm

>> To obtain more information about AK8157A, please visit here.


In the exhibition booth (booth number 5B-207 POWER SYSTEM JAPAN 2016) of Rubycon Corporation has planned the demonstration of its high-performance condenser, which uses our product. You will feel the superior sound quality of AK4490EN.

>> Pease visit here.


● 3rd Generation 32-bit 2ch Premium D/A Converter

 Product Name AK4490EN VERITA AK4490EN
 Premium D/A Converter
 Premium D/A Converter
 DR, S/N  120dB (Mono mode: 123dB)
 THD+N  -112dB
 Sampling Rate  30kHz to 768kHz
 DSD Input
 Max: 11.2MHz
 Sound Color  5 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 Mode  Full Differential Output
 VELVET SOUND Technology  Low-distortion technology
 OSRD (Over Sampling Ratio Doubler) Technology
 Power Consumption  100mW  145mW
 Power Supply  Analog: 4.75 to 5.25V
 Digital: 1.6 to 3.6V
 Analog: 4.75 to 5.25V
 Digital: 3.0 to 3.6V
 Operation Temperature  -40 to 85°C
 Package  48-pin QFN (6mm x 6mm)
 48-pin LQFP (7mm x 7mm w/o lead frame)
 48-pin LQFP (9mm x 9mm w/ lead frame)
 Sales Start  April 2016  Available Now

  Distributors/ Representatives

 Global Web Distributor
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.
Audio2Go 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 ProTM 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.