24-bit audio DAC a power miser

5 March 2008 Analogue, Mixed Signal, LSI

STMicroelectronics has announced a very high performance 24-bit audio DAC (digital to analog converter) that is intended for the mobile music market and provides 103 dB signal-to-noise ratio through the whole audio path, while also embedding the company's innovative playback time extender (PTE) processing scheme to minimise power consumption. The single-chip STw5210 audio solution also integrates power management circuitry to simplify system design and enable direct connection to a battery, and is available in small TFBGA and VFQFPN packages.

The new DAC, with Line and Headset outputs, meets the increasing demand for mobile music handsets to provide higher audio quality coupled with longer playing time. Normally an increase in quality means increased power consumption, due to the additional processing required. However, the STw5210's embedded PTE block allows music to be played autonomously, driven by the phone's 32 kHz clock while the rest of the platform is switched into a power-saving state. Overall, power consumption is reduced dramatically, therefore increasing battery life and playback time without compromising audio quality, making the chip ideal for mobile phone applications.

Easy system implementation, minimum bill of materials (BOM), and a very small footprint are ensured by integrated power management, eliminating the need for an external voltage regulator, and the built-in 50 mW headset amplifier, which operates without coupling capacitors.

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