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Audio front end halves power draw, doubles performance

Posted: 14 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:audio front end? power draw? DAC?

austriamicrosystems has extended its audio front end portfolio with a new device that promises low power consumption at a high audio performance by featuring a sub-7mW stereo DAC at over 100dB SNR.

The AS3543 is the latest member of a family of integrated audio and power management devices that combine in a single chip all system analog functions required around a digital SoC for mobile entertainment products. austriamicrosystems targets versatile single-chip companion analog devices that complement increasingly complex mobile SoC processors, saving board space and cost while offering improved performance when compared to discrete components.

The AS3543 is a flexible and highly integrated audio and power management device, which includes functions such as low-power stereo audio DACs and ADCs with line audio output and input, microphone input, headphone amplifier with direct drive capabilities, battery charging for Li-ion and other popular types, efficient DC/DC step-up/step-down power converters, LDOs, ultralow-power RTC, battery switch and high-voltage backlight power unit. Advanced power management techniques like dynamic voltage with frequency scaling or adjustable DC/DC converters enable high efficiency over a wide range of current loads.

Handheld entertainment devices are increasingly docked in a cradle and connected to the speaker system of a car or home speaker accessory where the portable device replaces traditional home or car entertainment hi-fi. In both scenarios, the AS3543 takes advantage of a unique feature to minimize the considerable ground noise generated by the engine in the car or high current switching Class D amplifier from the speakers dock. A typical 3dB SNR gain has been measured at the reproducer by employing this technique.

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