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AKM audio codec targeted at portable A/V apps

Posted: 25 Apr 2003 ?? ?Print Version ?Bookmark and Share

Keywords:asahi kasei microsystems? ak4537? ak4534? audio codec? stereo adc?

The AK4537 audio codec of Asahi Kasei Microsystems (AKM) Co. Ltd integrates a 16-bit stereo ADC and DAC with stereo microphone, headphone, and speaker amplifiers.

The device is positioned as a single-chip solution for full audio recording and playback functions in portable devices such as PDAs, cellphones, and digital cameras. The stereo microphone circuit further improves the recording quality of these devices.

Available as a 52-pin QFN, it is pin- and register-compatible with the company's previous AK4534 audio codec but uses an enhanced low-power consumption circuit that reduces headphone amplifier operating current by 40 percent in playback mode. It provides sampling rates from 8kHz to 48kHz and operates between 2.4V to 3.6V.

The headphone amplifier has an internal mute circuit to eliminate the need for an external amplifier that reduces the generation of pop noises at power on/off. A 300mW speaker amplifier and PLL are also included for connection into CPUs.

Other features include a built-in MIC-ALC circuit; digital attenuator and mono and stereo two-system beep input when audio is played back; a power management function for control of on/off switching of power to each block circuit; and an interface for both 4-wire and I?C busses.

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