High Quality Sound D/A Converter dedicated to True Wireless Earphones

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Asahi Kasei Microdevices Corporation, (AKM), has developed a 32-bit mono portable audio DAC with a built-in headphone amplifier optimized for true wireless earphones, (TWS: True Wireless Stereo). The AK4332ECB supports both high quality sound and ultra-low power consumption, integrated into an ultra-small 30-pin CSP package.

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

VELVET SOUND technology is optimized in pursuing high quality sound and high performance for TWS. The AK4332ECB achieves high performance of -101dB THD+N and 109dB SNR with the industry's most advanced level of ultra-low power consumption at 2.8 mW. This will enable TWS playback for long times with high quality sound.

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

Further low power consumption is achieved by executing digital signal processing of the digital filtering and ΔΣ modulation with a Bluetooth SoC which utilizes small geometry transistors.

● Application

True Wireless Earphone (TWS : True Wireless Stereo).

Key Features

Main Specifications

Product Name AK4331ECB AK4332ECB
DAC  32-bit Stereo Portable
 Audio D/A Converter
 32-bit Mono Portable
 Audio D/A Converter
Sound Color  Four Types of Digital Filters
 - Acoustic Sound (Short Delay Sharp Roll-off, GD = 5.5/fs)
 - Acoustic Tone (Short Delay Slow Roll-off, GD = 4.5/fs)
 - Traditional Sound (Sharp Roll-off)
 - Traditional Tone (Slow Roll-off)
Headphone Amplifier  Ground Referenced Class-G Headphone Amplifier
 - Output Noise Level: -114dBV (Analog Volume = -10dB)
 - Analog Volume: +4 to -10dB, 2dB Step
 Output Power: 70mW with 8Ω  Output Power: 88mW with 8Ω
THD+N (Total Harmonic Distortion Pulse Noise)  -100dB  -101dB
SNR  109dB
Sampling Rate  Maximum 192kHz Master/Slave Mode
Jitter Cleaning Function  Available
 Asynchronous Sample Rate Converter
 Crystal Oscillator
Low Jitter PLL  Available
Digital MIC Interface  Available  None
Digital Audio Interface  PCM Input  PCM Input
 PDM 1-bit Input
 DSD Input
Resolution  32-bit
Number of Channels  2ch  1ch
Microcontroller Interface  I2C (400kHz)
VELVET SOUND Technology  Low distortion Technology
 OSRD (Over Sampling Ratio Doubler) Technology
Power Consumption  4.4mW (fs = 48kHz)  2.8mW (fs = 48kHz)
Power Supply  AVDD = CVDD = LVDD = 1.7 to 1.9V
 TVDD = 1.65 to 3.6V
 AVDD = CVDD = LVDD = 1.7 to 1.9V
Operation Temperature Range  -40 to 85°C
Package  36-pin CSP
  (2.533 × 2.371mm, 0.4mm pitch)
 30-pin CSP
  (2.371 × 1.971mm, 0.4mm pitch)
Mass Production  Now  Summer, 2019

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