Audio D/A provides output drive capabilities

San Jose, Calif. — AKM Semiconductor's newest member of its Audio2go family is a 24-bit stereo digital-to-analog (D/A) converter, with a ground-referenced capless headphone amplifier and a 2-volt rms line output amplifier, as well as an AC-coupled auxiliary line out.

The AK4342 D/A converter can be used in digital radios, music players and personal media players. It is especially suited for applications where an audio player can be used in the home (docking station), on the go (personal), or in the car (with an FM modulator).

AKM claims it's the only audio D/A converter with ground-referenced 2-V rms output from a single +3.3-volt supply. There are other products that deliver biased 2-V rms from a high voltage supply, or some that have capless headphone amps, but this is the only one with both DC-coupled 2-V rms and a headphone amp, according to the company.

The AK4342 D/A converter uses an internal charge pump to generate a negative rail from a single +3.3 V power supply, enabling a ground-referenced 2-V rms line output that connects directly to home audio amplifiers and receivers. The charge pump is also used for a 62.5-milliwatt headphone amplifier that is DC-coupled.

The D/A converter features a dynamic range of 100 dB and total harmonic distortion plus noise (THD+N) of -88 dB. Additionally, the AK4342 converter features a jitter-resistant switched capacitor output filter, analog volume controls for separate line output and headphone output, digital volume control, auxiliary stereo analog inputs, power management control of each circuit block, and a 3-wire or I2C bus control interface. The control and data interfaces are tolerant as low as 1.6 V.

See related block diagram

The AK4342 is packaged in a 32-pin QFN, with a footprint of 25-mm squared and a height of 1 mm. Power consumption is 90 mW with the charge pump active.

The AK4342 is available for mass production, and pricing for 10,000-unit volumes starts at $1.80. Click here for the preliminary AK4342 data sheet.

AKM Semiconductor , 1-888-256-7364,

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