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Mobile music market meets DAC with 102dB SNR

Posted: 01 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:mobile phone market? DAC SNR? phone music?

Mobile phone chip joint venture ST-Ericsson NV is sampling an audio-quality DAC for use in the mobile music market.

The STw5211 combines something called a Playback Time Extender with 102dB of SNR across the whole audio path. The chip should allow mobile phone companies to make music phones while doubling typical 10hr playback times. The STw5211 is housed in a wafer-level chip scale package.

ST-Ericsson did not state what resolution the DAC operates from, but for audio applications this should be 24bit digital data. The chip is implemented in 0.13?m CMOS and by incorporating the power management circuitry, the device can be directly connected to the battery with no need for external voltage regulators. Additionally, the headset amplifier is of "true ground" type and does not need coupling capacitors, ST-Ericsson said.

Total harmonic distortion is 66dB with sampling rate conversion at between 8kHz and 192kHz clock frequency. The device operates from a power supply of between 2.7V and 4.8V. Power consumption and dynamic range are adjustable, and the power consumption at highest resolution is 27mW with option to go to 5?W in standby.

"Typically, power consumption increases as features are enhanced and quality improved. However, STw5211 with PTE technology allows music to be played autonomously, while the rest of the platform is switched into a power-saving state," said Monica de Virgiliis, VP of the wireless multimedia group at ST-Ericsson, in a statement.

Volume production of STw5211 is planned for August 2009, with samples available this month.

- Peter Clarke
EE Times Europe

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