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Low-power stereo DAC improves sound of digital devices

Posted: 02 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:DAC? DSP? amplifier? speaker?

AKM Semiconductor has released AK4373, a 24bit stereo DAC with advanced DSP and integrated speaker and headphone amplifiers. This low-power stereo audio DAC is specially designed for portable devices such as Bluetooth headphones and personal navigation devices.

The headphone amplifier works well in either differential or single-ended mode, reaching high capacity outputs when operating with a low-voltage power supply. A pseudo-capless mode is also supported, taking away large capacitors for AC coupling. Output power for the headphone amplifier ranges from 90mW to 8W. The mono bridge tied load speaker amplifier drives up to 800mW into 8W.

With advanced DSP functions including high-pass and low-pass filters, stereo separation, five-band EQ and ALC, the AK4373 provides advanced sound field effects for digital music sources. An analog-mixing function offers beep sound inputs and external noise cancellation.

It also features a power supply management function allowing circuit controls block by block, controlled via a three-wire or IC ?C interface. The operating voltage of the analog core ranges from 2.2V to 3.6V; from 2.2V to 4V for the headphone/speaker amplifier; and from 1.6V to 3.6V for the digital interface.

The stereo DAC is available in a 32-pin QFN package (5mm x 5mm) that uses only 7mW in playback mode.

-Gina Roos

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