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audio/videoZONE Products for the week of February 23, 2009
Maxim Integrated Products Says…
Shunt-Mode, Audio Click-and-Pop Eliminator Saves Space and Cost
Tiny MAX9892 Eliminates Unwanted Clicks and Pops in Audio Applications
Maxim Integrated Products introduced the MAX9892, a shunt-mode, audio click-and-pop eliminator designed for portable multimedia devices. This simple IC provides 35dB of click-and-pop suppression to eliminate the irritating audible artifacts generated during startup and shutdown cycles. Available in tiny UCSP and µDFN packages, the MAX9892 only requires one 0.1µF capacitor to complete the solution. This low-cost, ultra-compact solution is ideal for cell phones, portable media players and gaming consoles, notebooks, mobile internet devices (MIDs), and other audio applications.
The MAX9892 eliminates click-and-pop noise on power and shutdown cycles by connecting to the output of the existing amplifier and providing a low impedance path to ground during power on and off. This device has two low-impedance analog switches that are open and do not affect to outcome signal during normal operation. These switches are turned on during startup and shutdown to shunt the clicks and pops to ground.
EN-Genius Says…
This is such a simple, but incredibly smart, part. The MAX9892 is designed to provide a low impedance path for audio signals – right at the headphone jack of the amplifier – to eliminate clicks and pops during power up and down. A single mute input activates the analog switches that perform the magic.
The MAX9892 can be operated from 1.7 V to 3.6 V with a typical 600 nA of supply current. Together with series resistors in the feed to the load the switches form a potential divider to the stereo audio. With those resistors at 30 Ω, and a load of 16 Ω, the switches provide a suppression of typically 35 dB. A SET pin allows the turn-off time to be adjusted from 1 ms to 100 ms with a single capacitor with a timing (in ms) of 0.2 x Cset (pF).
Simple, low-cost, easily implemented; what more could you want? The MAX9892 is a high volume part that will be copied quickly, but not before Maxim has drained a lot of the swamp.
The MAX9892 is in production in UCSP-6 and µDFN-6 with pricing at $0.38 in 1000-piece lots.
Data Sheet
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