AKM launches high performance multi-reference Class-D amplifier modulator

AKM has introduced a new Class-D two channel modulator, generating a remarkable 110dB signal-to-noise ratio and industry-leading sound reproduction.
The AK4730 marks AKM’s first entry into the high-power amplifier world and is aimed at both professional and consumer products.
AKM’s AK4730 exceeds Class-AB performance with Class-D efficiency. The input to AK4730 is digital and supports two-channel, 192kHz sampling. The chip combines a two-channel PWM modulator with pre-driver circuitry for external MOSFETs.
Unlike other solutions that use two voltage levels for modulation (H-Bridge), AKM’s Class D products utilise an advanced multi-reference E-Bridge architecture that achieves higher linearity and SNR performance for audio playback with fidelity closer to the original sound.
With an integrated driver, the AK4730 MOSFET output stage is a simple circuit and is easily incorporated into an audio system. Output power to suit system requirements can be readily achieved by changing the MOSFETs.
In addition to an on-chip PWM modulator and MOSFET driver, the AK4730 has built-in individual channel digital volume controls, tone controls, digital-realm output stage power supply regulation and an overload detection circuit. Simply connecting the power MOSFETs permits a complete class-D amplifier configuration. When combined with the AK4113 Digital Audio Interface IC, ultra-low crosstalk six-channel solutions are realised, simplifying the engineering of high-performance multi channel audio systems.
AK4730 samples in an 80-pin HQFP package as well as 70W and 100W output evaluation boards are available now.
(GB)