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Stereo codec touts TSC, mic, headphone amp

Posted: 20 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:stereo codec? touch screen control? microphone? headphone amplifier?

A low-power audio codec with a built-in microphone amplifier, touch-screen controller (TSC) and stereo headphone amplifier has been introduced by AKM Semiconductor Inc. The AK4673 makes for easy interfacing in mobile phone and portable A/V player designs, and is aimed at portable applications.

Key features include automatic level control, a stereo sound separation emphasis circuit, and support for continuous data read from the touch-screen panel. A recording input selector supports four stereo inputs while the output section includes analog playback mixing along with the 70mW pop-noise free stereo headphone amplifier.

The PLL for audio codec clock generation supports various cellular phone standards as well as the USB system clock frequency, and a power management function is able to control power for each circuit block. Host controller interface is I2C.

Specifications include a sampling rate that varies from 7.35kHz to 48kHz and respective operating ranges of 2.6-3.6V for the codec; 2.6-5.2V for the headphone amplifier; 2.5-2.6V for the TSC and MCU interface; and 1.6-3.6V for the audio interface.

The AK4673 is housed in a 57pin 5mm x 5mm BGA package, and its codec block is compatible with the existing AK4645 stereo codec. Evaluation boards and samples are available now.

- Rich Pell

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