Manufacturers

News

AKM develops new D/A converter with headphone amplifier, the AK4377, enabling DSD playback on smartphones

2018-05-10 | Return

Description

As distribution of high-resolution sound sources via music services grow, Direct Stream Digital, (DSD), sound sources are growing in popularity. Asahi Kasei Microdevices Corporation, (AKM), has developed a 32-bit stereo D/A converter with headphone amplifier, the AK4377, enabling playback of DSD sound sources in smartphones or portable music players. The AK4377 is a new, higher performing solution compared to the AK4376A, (released in 2017), adopted by many portable audio products, achieving even better SNR and THD+N characteristics.

Features

。 High Resolution Sound Source | Support of DSD256 Input

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.

。Enhanced Audio Performance

The AK4377 achieves -109dB THD+N and 128dB SNR, which is top performing for a compact DAC with headphone amplifier in portable audio. The AK4377 exhibits flat THD+N characteristics of -105dB or less in all audible bands, enhancing the ability to reproduce the original sound.

。 Live Acoustic Sound with VELVET SOUND Architecture

The AK4377 achieves fine, detailed sound playback via the, “VELVET SOUND”, architecture adopted in AKM premium DACs for high-end audio products.

Main Specifications：

Advanced D/A Converter With Headphone Amplifier

Product Name	AK4377ECB	AK4376AECB
DAC	2-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 Amplifier	Ground-referenced Class-G Stereo Headphone Amplifier 。Output Power: 60mW @ 16Ω 。Output Noise Level: -129dBV 。Analog Volume: +4 to -20dB & Mute 。Ground Loop Noise Canceling	Ground-referenced Class-G Stereo Headphone Amplifier 。Output Power: 60mW @ 16Ω 。Output Noise Level: -126dBV 。Analog Volume: +6 to -20dB & Mute, 2dB Step 。Ground Loop Noise Canceling
SNR	128dB	125dB
THD+N	-109dB	-107dB
Sampling Rate	8 to 768kHz Master/Slave mode	8 to 384kHz Master/Slave mode
DSD Input	DSD64/DSD128/DSD256 (DoP Input)	Not Available
Low Jitter PLL	Available
Crystal Oscillator	Available
Power Management Function	Available
Resolution	32-bit
Number of Channel	2 channels
Microcomputer Interface	I2C (400kHz)
VELVET SOUND Architecture	Switched Capacitor Filter OSRD（Over Sampling Ratio Doubler）Technology
Power Consumption	59.7 / 20.7mW (HP Mode / LP Mode, fs=44.1kHz)	36.3 / 13.7mW (HP Mode / LP Mode, fs=44.1kHz)
Power Supply	AVDD (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
Package	36-pin CSP (2.893 x 3.082mm, 0.4mm pitch)	36-pin CSP (2.74 x 2.56mm, 0.4mm pitch)
Sales Start	May 2018	May 2017

source:http://www.akm.com/