SOURCE: Intersil

April 24, 2006 06:00 ET

Intersil First in Industry to Introduce Ultra- Low-Distortion Audio/Data Switches

ISL54400, ISL54401 and ISL54402 Dual 2:1 Multiplexers Switch Between Data Signals and Audio Signals

MILPITAS, CA -- (MARKET WIRE) -- April 24, 2006 -- Intersil Corporation (NASDAQ: ISIL), a world leader in the design and manufacture of high-performance analog solutions, today announced the ISL544 00, ISL544 01 and ISL544 02 audio/data switches. These devices combine high bandwidth, low- capacitance switches for data signals with very low distortion, low- capacitance switches for audio so they can be used alternately for USB full- speed data download and 20mW per channel of MP3 encoded stereo audio playback through the same device. The ISL54400/01/02 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.

"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 packaging and ultra-thin micro QFN, which save 67 percent board area compared to a traditional TDFN package."

Full-Speed Data, Low-Distortion Audio Switching

The 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 20mW power levels into a 32 Ohm headphone load without clipping. 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.

Key Features of the ISL54400/01/02

-- Low-distortion negative signal capability up to 20mW per
   channel into 32 Ohms
-- Detection of VBus voltage on USB cable (ISL54400 and
-- Generation of VTerm voltage for USB D+/D- pull-up
   resistor (ISL54400)
-- Low-distortion headphone audio signals
    THD+N at 12mW into 32Ohm load 0.005 percent typical
-- Crosstalk (20Hz to 20kHz) -110dB
-- 1.8V logic compatible (ISL54402)
-- Single-supply operation (VDD)
    ISL54400 and ISL54401 2.5V to 3.6V
    ISL54402 1.8V to 5.5V
-- Available in
    2.1mmx1.6mm 0.5mm thick, uTQFN
    3mmx3mm 0.75mm thick TDFN Packages
Target Applications
--  MP3 and other personal media players
--  Cellular/mobile phones
--  PDAs
--  USB switching
--  Audio/USB switching
About Intersil's Precision Analog Switch Products

Intersil has a broad portfolio of analog switches that provide excellent performance across the entire input voltage range. Each new device incorporates more than 30 years of market experience into its design. Precision analog switches and MUXs from Intersil meet today's design challenges for low-voltage, low on-resistance and smaller packaging. Intersil leads in technology innovation with the industry's lowest- distortion and highest-ESD sub-0.5 Ohm analog switches, the ISL8484 and ISL8499, designed for handheld applications. To learn more about Intersil's broad switching portfolio, visit Intersil's Analog Switches, Multiplexers and Crosspoint Switches page at

Pricing and Availability

The ISL54400 is available now in a 10-lead DFN package and is priced at $1.07, the ISL54401 is available now in 10-lead DFN package and is priced at $1.04, and the ISL54402 is available now in a 10-lead DFN package and is priced at $0.79. All pricing is based on 1,000-unit quantities. More information on the ISL54400 is available at,1477,ISL54400,0.html, more information on the ISL54401 is available at http:/ /,1477,ISL54401,0.html , and more information on the ISL54402 is available at,1477,ISL54402,0.html. A large selection of amplifier products is supported by Intersil's iSim™ online design tool. To explore these solutions, visit To view a broad range of application block diagrams, visit Intersil's Application Design Center at

Note to editors: To view a high-resolution downloadable photo of the ISL54400/01/02, visit Intersil's photo room at:

About Intersil

Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, other handheld systems, and notebooks. Intersil's product families address power management functions and analog signal processing functions. Intersil products include ICs for battery management, hot-swap and hot-plug controllers, linear regulators, supervisory ICs, switching DC/DC regulators and power MOSFET drivers; optical storage laser diode drivers; DSL line drivers; video and high performance operational amplifiers; data converters; interface ICs; analog switches and multiplexers; crosspoint switches; voice-over-IP devices; and ICs for military, space and radiation- hardened applications. For more information about Intersil or to find out how to become a member of our winning team, visit the Company's web site and career page at

iSim is a trademark of Intersil Americas, Inc. All other brands or product names are trademarks or registered trademarks of their respective holders.

Contact Information

  • Media Contact
    Kim Fehrt
    Public Relations Manager
    Intersil Corporation
    (408) 546-3566
    Email Contact