All for the ultimate Real Live Sound
lead a new era of High-resolution audio

Premium Portable Hi-Fi Audio Solution

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.

AKM is the one-stop provider of key device for high-resolution portable audio system D/A converter, headphone amplifier, LDO and clock generator.

  • DACs
    Premium D/A Converters
  • HP AMP
    Premium Headphone Amplifier
  • LDO
    Premium LDO
  • CLOCK
    Premium Clock Generator
Premium Portable Hi-Fi Solution

Providing the most suitable systems for portable audio,
Premium Portable
Hi-Fi Audio Solution

VELVET SOUND Audio 2 Go

The AK4492 is a premium D/A convertor (DAC), which inherits high quality sound technologies of the AK4490 that has been adopted by many high-end models of portable audio since release in 2016. It achieves the industry’s leading lowest distortion characteristics. It also consumes very low power, making it suitable for portable applications pursuing high quality sound.

In addition, as a solution to extract the maximum performance of the DAC, AKM provides an ultra-low noise/distortion headphone amplifier, the AK4205, and a low noise audio LDO, the AK1110 with the AK4492.
AKM has also been providing AK8157A, the clock generator for DAC of low phase noise MCLK/BICK/LRCK for Premium Audio.

AKM provides these premium portable audio solution and products as one-stop, and contributes to improving sound quality of portable audio equipment.

AKM Premium Portable Audio Solution (AK4492ECB+AK4205EN+AK1110AEU)
Evaluation Board
AKM Premium Portable Audio Solution
AKM Premium Portable Audio Solution (AK4492+AK4205+AK1110)
Evaluation Board (enlarged view)
AKM Premium Portable Audio Solution

Premium Portable
D/A Converters

VELVET SOUND
Designed by
VELVET SOUND

The lineup of new flagship AK4492ECB and high-end AK4490EN have been completed.
These two stereo DACs target portable audio systems from high-end to middle range class.

Product Portfolio -Premium Portable DACs -
* Bubble Size = "Sound Quality"

Premium 32-bits D/A Converter "AK4492"
enables reproduction of original acoustic sound in portable audio

AK4492ECB
AK4492ECB
High-end Premium D/A Converter

The AK4492ECB accomplishes low distortion and low power consumption at the industry’s highest level with AKM’s VELVET SOUND technology and original process dedicated to audio products. A 96-pin WLCSP is used for the AK4492, downsizing from the AK4490EN.
High-resolution audio sources are supported for digital input, up to 768kHz PCM and 11.2MHz DSD data.
The AK4492 has six types of 32-bit digital filters, giving simple and flexible sound tuning in a wide range of applications.

Lineup

Product Name AK4492ECB
AK4492ECB
Flagship
Premium
Portable
D/A Converter
AK4490EN
AK4490EN
Premium
High-end
Portable
D/A Converter
DR, S/N127dB120dB
THD+N
(Total Harmonic
Distortion plus
Noise)
-115dB-112dB
Sampling Rate8 to 768kHz30 to 768kHz
DSD InputMax 11.2MHz
Sound Color6 types, 32-bit 8x Digital Filter
- Acoustic Sound
- Acoustic Tone
- Traditional Sound
- Traditional Tone
- Natural Tone
- Harmonic Sound
5 types, 32-bit 8x Digital Filter
- Acoustic Sound
- Acoustic Tone
- Traditional Sound
- Traditional Tone
- Natural Tone
Resolution32-bit
Channel2ch
OutputLow Distortion Differential Output
VELVET SOUND
Technology
・Low Distortion Technology
・OSRD(Over Sampling Ratio Doubler)Technology
Power Consumption155mW100mW
Power Supply(with Internal LDO)
TVDD=AVDD= 3.0 to 3.6V,
VDDL/R= 4.75 to 5.25V
(without Internal LDO)
TVDD=AVDD= DVDD to 3.6V,
VDDL/R= 4.75 to 5.25V,
DVDD= 1.7 to 1.98V
Operating
Temperature
-40 to 85°C
Package96-pin WLCSP (5.64mm x 5.64mm)48-pin QFN (6.0mm x 6.0mm)
Sales Start2017.4Available Now

Premium Portable
Headphone Amplifier

VELVET SOUND
Designed by
VELVET SOUND

Ultra-low Noise/Distortion Headphone Amplifier "AK4205",
with an analog switch feature optimized to portable applications

AK4205EN
AK4205EN
Premium Headphone Amplifier

The AK4205 is a stereo headphone amplifier targeting high resolution with a built-in analog switch for mobile Hi-Fi. The AK4205 is housed in a small 36-pin QFN package, which saves the mounting area in the system board by integrating resistors for gain adjustment and a low-pass filter.

AK4205EN Specifications

AK4205EN
AK4205EN
Ultra-low Noise/Distortion
Stereo Headphone Amplifier
DR, S/N124dB
THD+N-118dB@32 Ω / -120dB@600 Ω
InputDifferential
Gain Setting ResisterIntegrated
LPFSecond LPF
Analog SwitchIntegrated
Path SwitchingPossible(Audio⇔AUX)
Output Level1Vrms (RL=32Ω, THD+N= -118dB)
2Vrms (RL=600Ω, THD+N= -120dB)
Pop and Click Noise-less
Switching
Possible
Negative Power Supply
of Analog Switch
Integrated
Mute-115dB
Power Consumption79mW
Power SupplyPositive Power for Headphone Amp: 6.0V,
Negative Power for Headphone Amp: -5.0V
Reference Voltage: 6.0V,
Analog Switch Power: 3.3V
Operating Temperature-40 to 85°C
Package36-pin QFN (5.0mm x 5.0mm)

Premium Portable LDO

VELVET SOUND
Designed by
VELVET SOUND

2ch Output Ultra-low Noise LDO Regulator "AK1110",
is capable of providing a reference voltage suitable for DACs.

AK1110AEU
AK1110AEU
Premium LDO

The AK1110 is a dual output low dropout linear regulator that accomplishes both low noise and high PSRR characteristics. A small PLP10-2725 package with heat sink is used. The best sound quality can be achieved since the AK1110 divides the VREF and VDD lines internally to avoid noise interference.

AK1110AEU Specifications

AK1110AEU
AK1110AEU
2ch output Low Noise High PSRR Audio LDO Regulator
Input Voltage Range6 to 14V
Maximum Output CurrentLDO1: 200mA /
LDO2: 100mA
Output VoltageLDO1: 5.0V /
LDO2: 5.0V
In/Output Voltage DifferenceLDO1: 360mV /
LDO2: 360mV
Output NoiseLDO1: 2μVRMS (f=10Hz to 100kHz) /
LDO2: 1μVRMS (f=10Hz to 100kHz)
Ripple RejectionLDO1: 83dB (f=1kHz) /
LDO2: 100dB(f=1kHz)
NP Terminal to Reduce
Output Noise
Existing
On/Off Control FunctionExisting
Over Current ProtectionIntegrated
Thermal ProtectionIntegrated
Ceramic CapacitorAvailable
Operating Temperature-40 to 85°C
Package10-pin PLP (2.7mm × 2.5mm)

Premium Portable
Clock Generator

VELVET SOUND
Designed by
VELVET SOUND

A Dedicated Clock Generator
for Premium D/A Converters AK8157A

AK8157A
AK8157A
Dedicated Clock Generator

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

AK8157A Specifications

AK8157A
AK8157A
Dedicated Clock Generator
External Clock
Input Frequency
9.6MHz
Clock Frequency3 frequency selectable outputs
Sampling Rate- MCLK: 16.384, 22.5792, 24.576MHz
- BCLK: 2.048 to 24.576MHz
- LRCK: 32 to 384kHz
Clock OutputEnable / Disable Control
Low JitterRMS Jitter: 45ps (10Hz to 5MHz)
Power Consumption14.4mW
Power SupplyVDD1-4: 1.7 to 2.0V
Operating Temperature-40 to 85°C
Package16-pin WLCSP (1.55mm x 1.55mm)

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