The Intersil ISL54409 and ISL54410 are Dual SPST
(Single Pole/Single Throw) switches that provide a very
low distortion audio path for a stereo headphone and
can be connected in a wired-OR configuration at the
switch outputs with USB2.0 HS signals for Audio/USB
signal multiplexing to a common connector. The audio
switch path can be disabled to provide high signal
isolation, preventing crosstalk between the audio codec
and USB data signals.
The ISL54409 and ISL54410 analog switches are
negative swing capable with a single supply voltage and
maintain excellent THD performance within a signal
range of -1V to +1V. The switch terminals have low pin
capacitance (4pF typical), minimizing impact to USB 2.0
High-Speed signals. The ISL54409 offers a Low Power
Shutdown mode while the ISL54410 offers a High
Off-Isolation mode. The ISL54410 contains active Audio
Click and Pop Elimination circuitry for AC-coupled audio
signals.
The ISL54409 and ISL54410 are available in a 8 Ld
TDFN (2mmx2mm) or a 10 Ld µTQFN (1.8mmx1.4mm)
package. They operate over a temperature range of
-40 to +85°C.

Features
• Single Supply Operation (VDD) . . . +2.7V to +5.0V
• Negative Signal Handling (See “Audio/USB wired-OR
Application” on page 8 on protecting USB controller)
• Low OFF Capacitance for HS USB . . . . . . . . . .4pF
• Power Off Protection
• THD+N at 1mW into 32Ω Load . . . . . . . . <0.02%
• Audio Muting . . . . . . . . . . . . . . . . . . . . .>110dB
• Low Power Consumption. . . . 21µW with 3V supply
• Low Power Shutdown Mode (ISL54409)
• Active Click and Pop Elimination Circuitry (ISL54410)
• USB VBUS Hot Plug Operation
• Available in 8 Ld TDFN (2mmx2mm) or 10 Ld µTQFN
(1.8mmx1.4mm) Package

Applications
• Consumer Entertainment Systems
• MP3 and other Personal Media Players
• Cellular/Mobile Phones and PDAs