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Low-power 24-bit DACs integrate headphone amplifiers for ultra-small personal electronics

AKM Semiconductor introduces two low-power DACs for MP3 players, camcorders, PDAs and cell phone applications. These devices integrate headphone amplifiers and analog mixing circuits

EDITORIAL CONTACT:
Tony Rodrigues
AKM Semiconductor, Inc.
(408) 436-8580
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Low-power 24-bit DACs integrate headphone amplifiers for ultra-small personal electronics

New AKM Devices target cell phones, MP3 Players, personal A/V systems.

San Jose, California May 30th, 2003 — Asahi Kasei Microsystems Semiconductor, Inc. (AKM), a leading supplier of audio ICs for professional and consumer markets today introduced the AK4366 and AK4367, ultra low-power, 24-bit 2-channel DACs with integrated high-output headphone amplifiers. Both devices are housed in small packages making them suitable for memory players, cellular phones, and PDAs.

The AK4366 is a single-function DAC with sample rates from 8KHz to 48KHz. It features an amplifier mute circuit, bass boost and de-emphasis circuits, and digital volume controls. The AK4367 has all of the features and performance of the AK4366, and also includes a 3-input analog mixer and a mono line output. This analog mixing enables side tone, beeps and other analog signals in equipments such as cellular phones to be mixed with the headphone amplifier output. The AK4367 also incorporates a mono line output that allows the stereo output to be mixed and sent to an external speaker amplifier independently of the stereo output.

Both the AK4366 and AK4367 feature 50mW headphone amplifiers with click-free power on and MUTE functions. The signal-to-noise ratio of the headphone amplifier is 92dB when using a 2.4 volt power supply. Both devices are powered by voltages from 2.2 to 3.3 volts, making them compatible with a wide range of system processors and interface logic.

The AK4366 and AK4367 are 35 percent smaller and consume 50 percent less power than previous AKM designs, making them the lowest power devices in AKM’s extensive integrated DAC lineup.

Price and Availability
The AK4366 is available in a 16-pin TSSOP package and the AK4367 in a very small 20-pin QFN package. The AK4366 is $2.89 in 1K quantities, the AK4367 is $4.61 in 1K quantities. Evaluation boards and samples are available now directly from AKM.