Portable Audio

All for Absolute Sound

The VELVET SOUND taken over genealogy of the Premium Audio Technology is realized in various scenes.

The advanced audio devices enable natural sound recording technology used in today's recording studios enabling a PCM recorder, and state-of-the-art Hi-Fi sound playback technology used in professional level audio equipment.

AKM's advanced audio devices optimized for portable equipment such as smartphone lead new era of the high-resolution digital audio.

FEATURED PRODUCTS

AK4332ECB

Low-power HiFi D/A converter for true wireless earphones

New Product

AK4332ECB

The AK4332 is an advanced 32-bit high sound quality mono audio DAC with a built-in ground-referenced headphone amplifier. It has four types of 32-bit digital filters for better sound quality, achieving low distortion characteristics and wide dynamic range. The AK4332 accepts PCM Data, PDM Data and DSD Data. It is available in a 30-pin CSP package, utilizing less board space than competitive offerings. It is ideal for true wireless earphones, (TWS: True Wireless Stereo).

High Performance of -101dB THD+N with only 2.8mW Power Consumption

Capable of Achieving Even Lower Power Consumption with support of a 1-bit PDM signal

Key Features

  • Maximum Sampling Frequency/Resolution :  192kHz/32-bit
  • S/N (SNR) :  109dB
  • Distortion (THD+N) :  -101dB
  • Sound Color Digital Filter :  4 types
  • Power consumptoin :  2.8mW (fs=48kHz)

PRODUCT CATEGORY

HiFi Headphone DAC

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AK4331ECB

Low-power HiFi Headphone DAC for Bluetooth headphones

AK4331ECB

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.

  • Maximum Sampling Frequency/Resolution :  192kHz/32-bit
  • S/N (SNR) :  109dB
  • Distortion (THD+N) :  -100dB
  • Sound Color Digital Filter :  4 types
  • Power Consumption :  4.4mW (fs=48kHz)

AK4377AECB

HiFi Headphone DAC for Smartphones

AK4377AECB

The AK4377A is stereo advanced 32-bit high sound quality audio DAC with a built-in ground-referenced headphone amplifier. An internal circuit integrates 32-bit digital filters for better sound quality, achieving low distortion characteristics and wide dynamic range. The sampling frequency supports up to 384 kHz. The AK4377A is available in a 36-pin CSP package, utilizing less board space than competitive offerings. The AK4377A is ideal for audio devices such as smartphones and tablets.

  • Maximum Sampling Frequency/Resolution :  384kHz/32-bit
  • S/N (SNR) :  125dB
  • Distortion (THD+N) :  -107dB
  • Sound Color Digital Filter :  4 types

AK4377ECB

HiFi Headphone DAC for Smartphones

AK4377ECB

This 32-bit advanced D/A converter (DAC) with a headphone amplifier is a higher performing solution of the AK4376A that is adopted by many portable audio products since it was launched in 2017.  The AK4377 achieves -109dB THD+N and 128dB SNR, which is top performing for a compact DAC with headphone amplifier in portable audio.  It exhibits flat THD+N characteristics of -105dB or less in all audible bands, enhancing the ability to reproduce the original sound.  The AK4377 accepts up to 768kHz PCM data and DSD256 input.  It can fully decode the large amount of information from the source, reproducing the original sound in the highest resolution.

The AK4377 is ideal for audio devices such as smartphones, tablets, portable music players, USB headphones, Bluetooth headphones.

  • Maximum Sampling Frequency/Resolution :  768 kHz/32-bit
  • S/N (SNR) :  128 dB
  • Distortion (THD+N) :  -109 dB
  • Sound Color Digital Filter :  4 types

HiFi Headphone DACs

Part# Status Ch# Resolution S/N THD
+N *
max
Fs *
DSD * 
Input
Sound
Color *
Power
Consumption
Vdd Analog
Output
HDP
Amp
Package Operation
Temp.
Others
      bit dB dB kHz MHz   mW V        
AK4331ECB MP 2 32 109 -100 192 No 4 types 4.4 1.7 to 1.9 Single Yes 36CSP -40 to 85 SRC
AK4332ECB MP 1 32 109 -101 192 Yes 4 types 2.8 1.7 to 1.9 Single Yes 30CSP -40 to 85  
AK4377AECB MP 2 32 125 -107 384 No 4 types 37.1/13.75 1.7 to 1.9 Single Yes 36CSP -40 to 85  
AK4377ECB MP 2 32 128 -109 768 11.2 4 types 59.7/20.7 1.7 to 1.9 Single Yes 36CSP -40 to 85  

[Notes]

* THD+N: Total Harmonic Distortion plus Noise
* max Fs: Maximum Sampling Frequency
* DSD: Direct Stream Digital
* Sound Color: AKM original digital filter

* Schedules of Samples and Production are subject to be changed without notice.

* The information in the datasheet is subject to be changed without notice.

D/A Converters (DAC)

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D/A Converters for Premum Portable Audio

Part# Status Ch# Resolution S/N THD
+N *
max
Fs *
DSD * 
Input
Sound
Color
Power
Consumption
Vdd Package
      bit dB dB kHz MHz   mW V  
AK4492ECB MP 2 32 127 -115 768 11.2 6 types 155 5.0/3.3 or 1.8 96CSP
AK4490EN MP 2 32 120 (123 *) -112 768 11.2 5 types 100 5.0 48QFN

D/A Converters for Advanced Portable Audio

Part# Status Ch# Resolution S/N THD
+N *
max
Fs *
DSD * 
Input
Sound
Color *
Power
Consumption
Vdd Analog
Output
HDP
Amp
Package Operation
Temp.
      bit dB dB kHz MHz   mW V      
AK4432VT MP 2 32 108 -91 192 No 4 types 25.7 3.0 to 3.6 Single   16TSSOP -40 to 105
AK4436VN MP 6 32 108 -91 768 No 5 types 79 3.0 to 3.6 Single   32QFN -40 to 105
AK4438VN MP 8 32 108 -91 768 No 5 types 102 3.0 to 3.6 Single   32QFN -40 to 105

[Notes]

* S/N (Mono mode)
* THD+N: Total Harmonic Distortion plus Noise
* max Fs: Maximum Sampling Frequency
* DSD: Direct Stream Digital
* Sound Color: AKM original digital filter

* Schedules of Samples and Production are subject to be changed without notice.

* The information in the datasheet is subject to be changed without notice.

DSP CODEC

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AK4962ECB

Advanced Audio DSP CODEC for Smartphones

AK4962ECB

The AK4962 is the new, higher performing solution of the AK4961 that has been adopted by many portable audio products mainly smartphones since it was launched in 2014. The AK4962 enhances high quality sound technologies of the AK4961 and has newly added digital active noise cancelling function.The AK4962 is a high performance with incredible sound quality audio CODEC for portable devices based on AKM’s VELVET SOUND architecture that has been widely adopted by well-established high-end audio companies. For sound processing, the AK4962 is capable of various functions for mobile applications reducing the load to the main processor while improving battery consumption.

The AK4962 provides clear sound experiences even in a noisy environment with a headphone that have microphones for noise collecting. This function works as digital compensations, realizing more efficient noise cancelling when compared to traditional analog implementation.

  • Reduce Ambient Noise for Headphones with Digital Active Noise Cancelling Function
  • Recording Function Provides Live Acoustic High Quality Sound
  • Best Playback Sound Quality 

DSP CODEC

Advanced Audio DSP CODEC

Part# Status Ch#
AD/DA
Resolution S/N
AD/DA
THD+N * 
DAC
max
Fs *
Sound
Color *
Power
Consumption
Vdd Ch#
DSP  In/Out
Ch#
SRC
Clock
Speed(max)
Data
RAM
Package Operation
Temp.
    Ch bit dB dB kHz   mW V     MHz word  
AK4962ECB MP 4/4 32 102/125 -106 384 4 types   1.7 to 1.9 10/10 8 122.88 22528 125CSP -40 to 85

[Notes]

* THD+N: Total Harmonic Distortion plus Noise
* max Fs: Maximum Sampling Frequency
* Sound Color: AKM original digital filter

* Schedules of Samples and Production are subject to be changed without notice.

* The information in the datasheet is subject to be changed without notice.

CODEC

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CODEC

Part# Status Ch#
AD/DA
Resolution S/N
AD/DA
THD+N * 
AD/DA
max
Fs *
Sound
Color *
Power
Consumption
Vdd Ch#
SRC
Audio
HUB
DIT SLIM
Bus
Package Operation
Temp.
Others
    Ch bit dB dB kHz   mW V            
AK4558EN MP 2/2 32 108/108 -92/-100 216 4 types 50mW 2.4 to 3.6         28QFN -40 to +105 PLL

[Notes] 
* THD+N: Total Harmonic Distortion plus Noise
* max Fs: Maximum Sampling Frequency
* DSD: Direct Stream Digital
* Sound Color: AKM original digital filter

* Schedules of Samples and Production are subject to be changed without notice.

* The information in the datasheet is subject to be changed without notice.


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.

velvetsound.akm.com by ASAHI KASEI MICRODEVICES