Atmel’s stereo D/A converter integrates audio power amplifier

Functional Block Diagram of Atmel's AT73C213

Rousset, France — Atmel Corp.'s AT73C213 integrates an audio-quality 20-bit stereo digital-to-analog converter (D/A converter) and an audio power amplifier providing up to 1 W.

The AT73C213 is suited for any application where a high-quality audio interface is required, such as mobile phones, PDAs, palmtop computers, digital still cameras, multimedia portable devices, music players, etc.

The AT73C213 integrates a complete high-performance stereo audio D/A converter delivering 93 dB dynamic range and a 32-ohm stereo headset driver with programmable volume control and mute function. The stereo D/A converter 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 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 of pair of stereo inputs as well as a differential monaural auxiliary input.

The D/A converter 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 (which can be, for example, from a voice codec output driver in mobile phones). 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 1 W at 5 V supply and 440 mW at 3.6 V supply. 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-, 20-bit audio formats are digitally programmable via a 4-wire SPI bus and the digital audio data is provided through a multi-format I2S interface.

The AT73C213, combined with any of Atmel's other power management products, can provide customers with a compact and low-cost analog solution based on a power supply unit and audio interface, said Michele Casetta, marketing manager for Atmel's power management and audio analog companion (PMAAC) product line. “The AT73C213 is a breakthrough solution for current and future consumer product generations where digital processing is migrating to below 0.13 mm technologies while maintaining high-quality analog performance with low-cost analog CMOS processes,” she said.

Atmel offers the AT73C213 in a 7 x 7 mm, 32-pin QFN package. It is available either mounted on a reference design board or as engineering samples. Production quantities are also available, with a reference price below $1.00 in large quantities.

Click here for the data sheet.

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