News Release

- New Product Information -

Just released, a HiFi D/A converter for smartphones with enhanced audio performance

Product Name
Product category: Audio > Audio D/A converter
32-bit Stereo D/A Converter with Headphone Amplifier
THD+N: -107dB (Output Power: 10mW)
               -106dB (Output Power: 25mW)
SNR:       125dB
Sampling Rate: 8 to 384kHz
Smartphones, Tablets


Asahi Kasei Microdevices Corporation, (AKM), has released the AK4377A, a D/A converter with headphone amplifier. This is the newer and higher performing solution compared to the AK4376A, (a 2017 release), which has been adopted by many portable audio products. The AK4377A inherits the same circuit architecture as the AK4377, designed for high-end digital audio players, which enhances audio performance and maintains low-power consumption. It is ideal for HiFi specialized smartphones.


● The higher performance replacement to the AK4376A that has been adopted by many smartphones

VELVET SOUND technology, used in AKM’s premium D/A converters for high-end audio products, has been further optimized for smartphones. The distortion characteristics of the high output power is improved compared with the AK4376A. The AK4377A achieves -106 dB THD+N at 25mW output power. The AK4377A can reproduce the full original sound source, even while playing at loud volumes.

● Audio characteristics are maintained even with a small circuit board

The AK4377A adopts an architecture which suppresses deterioration characteristics caused by external parts and the board layout. Therefore, it can provide stable and high-performance audio even on a highly integrated board such as one built for smartphones.

Main Specifications

32-bit Advanced D/A Converter With Headphone Amplifier
DAC32-bit Advanced Audio Stereo D/A Converter
Sound Color  - Short Delay Sharp Roll-off, GD=5.5/fs
 - Short Delay Slow Roll-off, GD=4.7/fs
 - Sharp Roll-off
 - Slow Roll-off
Headphone AmplifierGround-referenced Class-G Stereo Headphone Amplifier
 - Output Power:  60mW @ 16Ω
 - Output Noise Level: -125dBV
 - Analog Volume: +6 to -20dB & Mute, 2dB Step
 - Ground Loop Noise Canceling
THD+N -107dB (Output Power: 10mW)
-106dB (Output Power: 25mW)
Sampling RateMaximum 384kHz
Master/Slave mode
Low Jitter PLLAvailable
Crystal OscillatorAvailable
Power Management FunctionAvailable
Number of Channel2 channels
Microcomputer InterfaceI2C (400kHz)
Switched Capacitor Filter
OSRD (Over Sampling Ratio Doubler) Technology
Power Consumption37.1 / 13.75mW (HP Mode / LP Mode, fs=44.1kHz)
Power SupplyAVDD (DAC, PLL): 1.7 to 1.9V
CVDD (Headphone Amplifier, Charge Pump): 1.7 to 1.9V
LVDD (LDO2 for Digital Core): 1.7 to 1.9V (built-in LDO)
TVDD (Digital Interface): 1.65 to 3.6V
Operation Temperature Range-40 to 85°C
Package36-pin CSP (2.74 x 2.56mm, 0.4mm pitch)*
* Pin compatible with AK4376A
Sales StartSeptember 2018
* Information on this page is current on the date of press release.
* AKM and VELVET SOUND™ are trademarks of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.
* Appellations, company names and product names on this page are trademarks or registered trademarks of respective companies.

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