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RF/Microwave??

Receiver IC allows use of standard headphone jacks

Posted: 02 Feb 2006 ?? ?Print Version ?Bookmark and Share

Keywords:MAX11041? receiver IC? wired remote controller? Maxim Integrated Products?

Maxim Integrated Products Inc. introduced a wired, remote-controller receiver IC for portable media players. The new MAX11041 decodes up to 31 resistor values on an external, wired remote controller composed of pushbutton/membrane switches and 1 percent resistors. The device's architecture allows use of standard 3.5mm headphone jacks by multiplexing the remote signal onto the audio path through external DC-blocking capacitors. Alternatively, this device can utilize a single dedicated wire over the fourth connector of a standard 4-pin stereo headphone jack.

The MAX11041 continuously polls the keys while consuming 8W (5A at 1.6V to 3.6V). An I2C interface with 8-byte FIFO and interrupt notifies the host microcontroller of keystroke presence and records up to four different key states. Besides detecting keys, this device records key duration for advanced user-interface features. It detects simultaneous keys and implements a hold function to prevent inadvertent key presses. The MAX11041 also features automatic key debounce and switch-chatter rejection.

The MAX11041 is available in 4-by-4mm, 12-pin TQFN and 2-by-2mm UCSP packages that operate over the -45C to 85C temperature range. Prices start at 96 cents in quantities of 25,000 pieces and up.




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