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Atmel audio chip includes DAC, power speaker

Posted: 11 Feb 2005 ?? ?Print Version ?Bookmark and Share

Keywords:atmel? at73c213? audio companion chip?

Atmel Corp.'s AT73C213 audio companion chip for multimedia portable applications integrates an audio-quality 20bit stereo DAC and an audio power amplifier providing up to 1W. Manufactured on the company's low-cost mainstream CMOS process, the device suits application where a high-quality audio interface is required, such as new-generation cellphones, PDAs, palmtop computers, digital still cameras, multimedia portable devices and music players.

"The AT73C213 is a milestone in our product line," said Michele Casetta, Marketing Manager for Atmel's Power Management and Audio Analog Companion (PMAAC) product line. "Combined with any of our other power management products, it can provide customers with a compact and low-cost analog solution based on a power supply unit and audio interface."

The new chip integrates a stereo audio DAC delivering a 93dB dynamic range, followed by a 32-ohm stereo headset driver with programmable volume control and mute function. The stereo DAC comprises a multi-bit sigma-delta modulator with dither, continuous time analog filters and analog output drive circuitry. The master clock is 256 and 384 times the sampling frequency, allowing the choice of input data rate up to 50kHz, including standard audio rates of 48-, 44.1-, 32-, 16- and 8kHz. The stereo 32-ohm headset drivers also include a mixer of pair of stereo inputs, as well as a differential monoaural auxiliary input.

The DAC outputs can also be played back through a mixer buffer stage to the integrated audio power amplifier. The mono buffer stage can also receive the mixing of the stereo inputs as well as the differential monaural auxiliary input. The audio power amplifier is a dual-mode class AB amplifier with differential output and programmable volume control. In full power mode, it is capable of driving an 8-ohm loudspeaker at maximum power of 1W at 5V supply and 440mW at 3.6V supply. Meanwhile, in low power mode, it can drive the same loudspeaker as an earpiece, making it suitable as a hands-free driver in wireless handset applications. The volume, mute, power down, de-emphasis controls and 16-, 18-, 20bit audio formats are digitally programmable via a 4-wire SPI bus, and the digital audio data is provided through a multi-format I2S interface.

"Stereo and mono line input, high-quality stereo output and a mixing channel are unique features for portable handset applications. Few competitors are able to propose a high-quality audio converter and power speaker driver in a single chip as we do in the AT73C213," Casetta shared proudly.

The AT73C213 in housed in a 7-by-7mm, 32-pin QFN package and is available either mounted on a reference design board or as engineering samples. Production quantities are already available, with a reference price below $1 each for large orders.

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