Switches combine USB and low distortion capabilities

Milpitas, Calif. — Intersil Corp.'s dual single-pole, double-throw switches are said to combine low distortion audio and accurate USB 2.0 full speed data signal switching in the same low voltage device.

The ISL54400/01/02 dual 2:1 multiplexers are said to improve audio playback quality, eliminate external components and save significant board space over competing solutions. These devices are designed for mixed audio and data switching in handheld and audio accessory applications including MP3 and other personal media players, cell phones, and PDAs.

“The ISL54400/01/02 are the first commercially available devices in the industry to provide both low-distortion audio and USB switching capabilities,” said Chris Ludeman, marketing manager for Intersil's Switch and MUX products group. “Combining data and audio switches eliminates either the USB or headphone connector in devices such as portable MP3 players and camera phones, for overall cost savings. Also, automatic USB cable detection and the integration of external components associated with the USB data rate negotiation function results in further cost and space savings. These devices are available in TDFN (3 x 3 mm, 0.75-mm thick) packaging and ultra-thin micro QFN (2.1 x 1.6 mm, 0.5-mm thick), which save 67 percent board area compared to a traditional TDFN package,” he said.

Intersil's ISL54400 is a full-function device that has audio switches that provide a very low-distortion path suitable for MP3 playback into stereo headphone loads and can handle negative signal swings up to 20-mW power levels into a 32-ohm headphone load without clipping, according to Ludeman. It includes USB cable detection and data rate negotiation hardware functions. The ISL54401 includes the USB cable detection but not the data rate negotiation hardware functions. The ISL54400 provides none of the USB functions and is a basic audio/data switch.

Additional features of the muxes include total harmonic distortion plus noise (THD+N) of 0.005 percent typical (12 mW into 32-ohm load), crosstalk of -110dB (20 Hz to 20 kHz), 1.8-volt logic compatible (ISL54402), single-supply operation — 2.5 V to 3.6 V for the ISL54400 and ISL54401, and 1.8 V to 5.5 V for the ISL54402.

The ISL54400 is available in a 10-lead DFN package and is priced at $1.07. The ISL54401 is available in 10-lead DFN package and is priced at $1.04, and the ISL54402 is available in a 10-lead DFN package and is priced at 79 cents — all in 1,000-piece quantities. Click here for the ISL54400 data sheet. Click here for the ISL54401 data sheet. Click here for the ISL54402 data sheet.

Intersil Corp. , 1-888-468-3374,

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