Micronas chip puts audio into USB headset connectors
Micronas Semiconductors Inc. has launched a single-chip solution for designing USB headset connectors for PCs. The chip, UAC355xB, packs a complete audio system inside a USB connector, enabling system manufacturers to develop a variety of new digital headsets and freeing users from limitations of conventional analog headsets. The chip also eliminates the need for analog sound cards.
The chip contains a microcontroller core with USB interface functionality and a DSP unit with stereo DACs and ADCs. Optional GPIOs connect the part with peripheral hardware such as buttons, keyboards and LEDs. More complex peripherals like LCD displays can be controlled via I²C.
In lots of 100,000, the chip is priced from $4.50 and $6.50, depending on configuration. It is available in a 9-by-9mm PQFN or 64-pin PMQFP. A reference design is also available, and Micronas said the bill of materials for a complete USB headset totals less than $10.