austriamicrosystems has 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 low on-resistance of 0.4 Ohms with channel-to-channel matching of less then 0.03 Ohms, reducing the amount of signal deviations between channels to a minimum. Additionally, the AS1747 shows on-resistance flatness of 0.25 Ohms. The combination improves total harmonic distortion (THD+N) to 0.01% and yields a high quality audio signal.
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 degrees C.