Tokyo Japan, Sep 29 2010, Asahi Kasei Microdevices Corporation today launched the AK4953A, the newest product in the AKM Audio2go™ family, an enhanced version of the AK4643 and AK4645 that are widely used for sound processing in portable multimedia players, IC recorders and mobile phones. It is housed in a small QFN package, saving significant board space compared to existing solutions that require two or three chips. Microphone, headphone and speaker amplifiers are integrated, making the AK4953A ideal for IC recorders and portable multimedia players.
The AK4953A features outstanding performance to power consumption ratio. The stereo ADC and DAC achieve 96dB dynamic range, and 85dB and 80dB S/(N+D) respectively at a very low supply current of 3.3mA for the ADC and 3.6mA for the DAC (in HP out mode). The AK4953A has an integrated charge pump that generates an internal negative rail, enabling ground-referenced outputs for the cap-less headphone amplifier. This headphone amplifier eliminates large AC-coupling capacitors, achieving stable signal characteristics in low frequency bands, reducing cost and meeting space saving demands for portable devices. An integrated speaker amplifier has a wide operating voltage range of 0.9V to 5.5V, enabling a direct connection to a single cell battery. The microphone input circuit includes a digital microphone interface, converting 1-bit data (PDM) into 24-bit linear PCM data. The ADC output and digital microphone output are automatically adjusted by an ALC circuit, and high quality sound recording can be realized using the internal five-band equalizer.
The AK4953A integrates a low noise stereo microphone preamplifier that supports single-ended inputs, a power supply circuit for an external microphone supporting two line output switching, an ALC circuit for recording and playback, a digital volume control, a 24mW stereo headphone amplifier and a 400mW mono speaker amplifier. An integrated PLL can generate all required audio clocks internally, ensuring a simple interface to external processors. The PLL includes an internal loop filter, eliminating the traditional external connection requirement. Functions are controlled through serial control, either 3-wire or I2C bus interfaces. The AK4953A supports sampling rates from 7.35kHz to 96kHz, and the operating voltage ranges from 2.85V to 3.5V for the analog block, from 1.6V to 2.0V for the digital block, from 0.9V to 5.5V for the speaker amplifier and from 1.6V to 3.6V for the digital interface block. It is housed in a space saving small 36-pin QFN package (5.0mm x 5.0mm). Evaluation boards and samples are available now. To obtain more information, contact Asahi Kasei Microdevices Corporation, Data Converters, 1-105 Kanda Jinbocho, Chiyoda-ku, Tokyo 101-8101, Japan or visit our web site “www.akm.com”.
About Audio2go™The Audio2go™ brand identifies AKM products that are designed for portable applications, including mobile phones, media players, digital camera and PDAs. The Audio2go™ brand product family provides a feature rich, single chip solution offering low power consumption and high Audio fidelity.