Intersil Corporation (Intersil) has introduced new highly integrated, ultra-low distortion stereo audio switch, ISL54406. The ISL54406 eliminates unwanted clicks and pops typically caused by powering up and down, muting on and off, and switching between audio sources. High audio performance is achieved on several levels with this new switch. The ISL54406 delivers total harmonic distortion (THD) of just 0.015% at 1mW into a 32O load.
The combination of audio performance and reduction in external components makes the ISL54406 the ideal choice for compact MP3 players, docking speaker systems, cell phones, portable DVD players and sound cards.
The low THD switching path can be interrupted to provide >110dB of off-isolation for signal muting purposes into 32O 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 unique instant-on capability needs no timing capacitor and requires only 7 microamps 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 5 nanoamps. This minimizes current drain in devices such as portable MP3 players that are placed in a ‘hibernation’ mode when not in use.
The ISL54406’s comprehensive “click and pop” elimination scheme effectively 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.
Pricing and Availability
The ISL54406 is available in 1.8mm x 1.4mm µTQFN packages, with prices starting at $0.51 each in 1,000-piece quantities. A 10 Ld 3 x 3 TDFN version is priced at $0.61 each, and the 10 Ld 3 x 3 TDFN T+R version is priced at $0.64 each, both in 1,000-unit quantities.