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DAC provides output drive capabilities

Posted: 25 Apr 2006 ?? ?Print Version ?Bookmark and Share

Keywords:AK4342? digital-to-analog converter? DAC? AKM Semiconductor? Bettyann Liotta?

AKM Semiconductor's newest member of its Audio2go family is a 24bit stereo DAC with a ground-referenced capless headphone amplifier and a 2V rms line output amplifier, as well as an AC-coupled auxiliary line out.

The AK4342 DAC 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 DAC with ground-referenced 2V rms output from a single 3.3V supply. There are other products that deliver biased 2V rms from a high voltage supply, or some that have capless headphone amps, but this is the only one with both DC-coupled 2V rms and a headphone amp, according to the company.

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

The DAC features a dynamic range of 100dB and total harmonic distortion plus noise of -88dB. 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 1.6V.

- Bettyann Liotta
eeProductCenter




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