Low-Power Advanced 32-bit DAC with HP

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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 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.

● Application

Smartphones, Tablets

Key Features

Advanced D/A Converter 
with Headphone Amplifier
Product NameAK4377AECB
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 ~ -20dB & Mute, 2dB Step
 - Ground Loop Noise Canceling
-107dB(Output Power:  10mW)
-106dB(Output Power:  25mW)
Sampling Rate8 to 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-40 ~ 85°C
Package36-pin CSP (2.74 x 2.56mm, 0.4mm pitch)*
*Pin compatible with AK4376A
Sales StartSeptember 2018

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