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Leadis debuts standalone Class-G headphone amps

Posted: 29 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:LDS9505 LDS9504 amplifiers? headphone Class G? power?

Leadis Technology Inc. is offering samples of what it claims as the world's first standalone Class-G headphone amplifiers, the LDS9505 and LDS9504, which will support power-sensitive applications such as mobile phones, MP3/portable media players, portable gaming, GPS/ personal navigation devices, notebook computers, and other portable audio products with a headphone output.

According to Leadis, the LDS9505 and LDS9504 are optimized for ultralow power dissipation dramatically increasing battery run-time. Similar to earlier Leadis audio products, the LDS9505 and LDS9504 incorporate the proprietary Gmax technology. The LDS9505 and LDS9504 also feature the new Leadis ARA (Adaptive Rail Amplifier), an advanced proprietary charge-pump technology. According to Leadis, ARA tracks the envelope of the audio signal in real-time to dynamically adjust internally generated power supply rails. Minimizing the voltage drop from the power supply rails to the audio waveform envelope eliminates wasted power found in competing headphone amplifiers solutions.

The LDS9505 and LDS9504 require a total of 4mW quiescent power, with ultralow 5.5mW power dissipation per channel at typical headphone listening levels (0.5mw x 2). Additionally, the devices are capable of up to 63mW in single-ended stereo and 106mW in mono BTL output, with a SNR of 102dB.

Single-unit pricing for 1,000-piece purchases is $1.80 for the LDS9505 and $1.60 for the LDS9504. Both are packaged in a standard 20-pin 4mm x 4mm QFN, as well as ultrasmall chip-resistant Super-CSP1.8mm x 2.3mm packaging. Samples are available now, with mass-production quantities available in Q3.

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