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AKM converter with high-quality audio recording features

Posted: 21 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:asahi kasei Microsystems? akm? adc? dac? converter?

Asahi Kasei Microsystems Co. Ltd (AKM) rolled out a single-chip 16bit stereo A/D and D/A converter with high-quality audio recording features for use in digital still cameras, digital video cameras and smart phones.

The new AK4642 features a host of improvements including a built-in microphone equalizer, microphone, headphone and speaker amplifiers, stereo ADC and stereo DAC, wind-noise filter and stereo separation emphasis circuits.

According to the press release, the headphone amplifier's integrated mute circuit eliminates the pop noise at power on/off, so there is no need for an external mute circuit. The built-in speaker amplifier is compatible with piezoelectric speakers, and needs approximately half the mounting area of its forerunner, the AK4537 low-power audio CODEC.

Additional integrated functions include an exclusive record/playback auto level control circuit, a microphone amplifier for differential input and a digital attenuator for volume control. The AK4642 also features a power management function for switching power on and off to each circuit block, a uP interface compatible with both 3-wire serial and I?C bus, and PLL circuitry for simple system interfacing.

Additionally, the AK4642 is software compatible with the AK4631 mono codec. Housed in a 32-pin QFN package, the new product offers sampling rates ranging from 7.35kHz to 48kHz, and operating voltage ranging from 2.6V to 3.6V. Evaluation boards and samples are also available.

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