Audio codec takes headphone amp onboard

A low power 20bit audio codec with an integrated capless headphone amplifier is ideal for mobile phones, smart phones, music players and personal media players.

AKM Semiconductor has introduced the AK4665A, a low power 20bit audio codec with an integrated capless headphone amplifier.

This device is ideal for mobile phones, smart phones, music players and personal media players.

The AK4665A has an integrated charge pump circuit, which creates a negative power supply for the headphone amplifier.

This allows the audio signal to be ground referenced, thus eliminating the need for external DC blocking capacitors and saving significant board space.

The AK4665A also features an innovative power-on mute circuit for fast 20ms pop-free on/off switching.

The analogue power supply range is 2.6 to 3.6V, and the digital power supply for the external control interface operates as low as 1.6V.

The AK4665's digital recording automatic level control (ALC) enables a high-quality recording platform that also cuts power consumption.

The AK4665A includes a dedicated stereo lineout with a volume control that is independent of headphone output, enabling separate level control of an external device such as a stereo speaker amplifier.

Differences in multisource recording levels are adjusted by a sophisticated output ALC circuit, ensuring constant playback volume.

Completing the AK4665A's feature-rich offerings are an integrated PGA microphone amplifier, integrated microphone power supply, playback volume control and bass boost, stereo and mono auxiliary analogue inputs, independent power management for each circuit block, and a three-wire serial control interface.

The AK4665A is packaged in a 32-pin QFN, with a footprint of just 25mm2 and a height of 1mm making it an ideal choice for handheld media players.

Power consumption is very low at 54mW.

The AK4665A is available for mass production, and pricing for 10,000-unit volumes starts at $2.44.

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