Atmel is offering a high quality audio interface capability for highly portable multimedia players with a cost-reduced IC containing an audio quality 20-bit stereo digital-to-analogue (DAC) and 1W audio power amplifier.

The AT73C240's stereo audio DAC has a 90dB dynamic range, followed by a 32ohm stereo headset driver with programmable volume control and mute function.

Atmel believes there are cost advantages in offering high performance analogue circuits which will run alongside, and not be integratd in to, the digital elements of the design.

"The AT73C240 is a breakthrough solution for current and future consumer product generations where the generic digital processing integrated circuits are migrating below 90nm technologies, while putting the analog section outside to decrease system cost,” said Michele Casetta, marketing manager for Atmel’s power management and analogue audio products.

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 or 384 times the sampling frequency, allowing the choice of input data rate up to 50 kHz, including standard audio rates of 48, 44.1, 32, 16 and 8 kHz. The stereo 32-Ohm headset drivers also include a mixer for a pair of stereo inputs.

The DAC outputs can also be played back through a mixer buffer stage to the integrated audio power amplifier.

The audio power amplifier is a dual-mode AB class amplifier with differential output and programmable volume control. In full power mode, it is capable of driving an 8ohm loudspeaker at maximum power of 1W at 5.5V supply and 440mW at 3.6V supply.

More information: www.atmel.com