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New analog switch AS1747 is optimized for audio and can handle negative signals with a single positive power supply

Unterpremstaetten, Austria (September 30, 2008) – austriamicrosystems (SWX: AMS), a leading global designer and manufacturer of high performance analog ICs for communications, industrial, medical and automotive applications, today expanded its analog switch portfolio with the AS1747, a dual SPDT (single-pole/double-throw) low-voltage analog signal switch. The switch, which is the first within a family of switches with negative signal capability, allows designs without AC coupling capacitance in audio applications.

"Switches which are able to handle negative swings like the AS1747 are an ideal match for low-power, negative-swing capable audio amplifiers to achieve high-quality audio performance," said Walter Moshammer, Director Marketing Standard Linear at austriamicrosystems. “This system actually improves signal quality by removing the AC coupling capacitors of the speaker, the primary source for audio pop noise. An additional benefit of this design is a longer battery lifetime, higher signal amplitude and reduction in cost and space.”

The AS1747 combines the extremely low on-resistance of 0.4Ω with an excellent channel-to-channel matching of less then 0.03Ω, reducing the amount of signal deviations between channels to a minimum. Additionally, the AS1747 shows a remarkable on-resistance flatness of 0.25Ω. Altogether this improves total harmonic distortion (THD+N) to superb 0.01% and yields an excellent audio signal quality.

The AS1747 can handle negative signals with a single positive 1.8V to 5.5V power supply and is available in a 10-pin TDFN(3x3mm) package suitable for operating environments ranging from -40 to +85°C. More product specific information can be downloaded from the austriamicrosystems website at http://www.austriamicrosystems.com/Analog-Switches/AS1747

About austriamicrosystems
austriamicrosystems is a leading designer and manufacturer of high performance analog ICs, combining more than 25 years of analog design capabilities and system know-how with its own state-of-the-art manufacturing and test facilities. austriamicrosystems leverages its expertise in low power and high accuracy to provide industry-leading customized and standard analog products. Operating worldwide with more than 1,000 employees, austriamicrosystems focuses on the areas of power management, sensors & sensor interfaces, portable audio and car access in its markets Communications, Industry & Medical and Automotive, complemented by its Full Service Foundry activities. austriamicrosystems is listed on the SWX Swiss Exchange in Zurich (ticker: AMS).