Audio switch employs click and pop elimination

Intersil has introduced the ISL54406 ultra-low distortion stereo audio switch that eliminates unwanted clicks and pops caused by powering up and down, muting, and switching between sources.

The combination of audio performance and reduction in external components makes the ISL54406 a suitable choice for compact MP3 players, docking speaker systems, mobile phones, portable DVD players and sound cards.

The ISL54406 delivers total harmonic distortion (THD) of just 0.015 per cent at 1mW into a 32ohm load.

The low THD switching path can be interrupted to provide >110dB of off-isolation for signal muting purposes into 32ohm or high-impedance loads, which are typical in consumer and automotive entertainment systems.

Recovery from muting is instantaneous even with very large DC blocking capacitors.

This instant-on capability needs no timing capacitor and requires just 7uA of supply current.

The ISL54406 provides both active and standby modes of operation, with the standby mode reducing the supply current to a maximum of 5nA.

This minimises current drain in devices such as portable MP3 players that are placed in a 'hibernation' mode when not in use.

The ISL54406's 'click and pop' elimination scheme isolates low and high impedance loads from audio spikes and glitches and requires no external timing components to deal with DC blocking capacitors placed between the single supply codec and the load.

The ISL54406 is available now in 1.8mm x 1.4mm uTQFN, 10 Ld 3mm x 3mm TDFN, and 10 Ld 3mm x 3mm TDFN T+R packages.

Back to top