SOURCE: Leadis Technology, Inc.

April 22, 2008 17:15 ET

Leadis Technology Introduces World's First Standalone Class-G Headphone Amplifiers

Portable Audio Headphone Amplifiers With Ultra-Low Power Dissipation Featuring Leadis Gmax™ and ARA™ Technologies

SUNNYVALE, CA--(Marketwire - April 22, 2008) - Leadis Technology, Inc. (NASDAQ: LDIS), an analog and mixed-signal semiconductor developer of color display drivers, power management ICs, LED drivers, and audio ICs for portable consumer electronic devices, continues its roll-out of audio ICs with the announcement of sample availability of the world's first standalone Class-G headphone amplifiers, the LDS9505 and LDS9504.

The LDS9505 and LDS9504 are well suited for power sensitive applications such as mobile phones, MP3/PMPs (portable media players), portable gaming, GPS/PNDs (personal navigation devices), notebook computers, and other portable audio products with a headphone output.

The LDS9505 and LDS9504 are optimized for ultra-low power dissipation dramatically increasing battery run-time. Following in the foot-steps of earlier Leadis audio products, the LDS9505 and LDS9504 incorporate Gmax™ technology, a proprietary and highly effective implementation of Class-G amplification.

The LDS9505 and LDS9504 also feature the new Leadis ARA™ (Adaptive Rail Amplifier), an advanced proprietary charge-pump technology. 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 ultra-low 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.

High Efficiency - High SNR - No Filters

Using both Leadis Gmax™ and ARA™ technologies, the LDS9505 and LDS9504 retain the benefit of analog amplifiers (no filters and high signal quality), with a fraction of the power dissipation. "Portable audio manufacturers want increased performance while demanding longer battery life, which creates a challenging design scenario," said Greg Davis, Senior Director of Leadis Audio Business Unit. "They want to keep a smaller battery for the obvious cost, size, and weight benefits yet still get long battery life. At the same time, the headphone amplifier has become a larger percentage of the overall power consumption budget. Our LDS9505 and LDS9504 headphone amplifiers solve this issue by squeezing out every possible minute of battery run-time so a smaller battery can be used."

Excellent "Pop and Click" and "Zipper Noise" Performance

A major concern for manufactures is pop and click sounds during device power-up. Also of concern is "zipper-noise" when the volume is changed. Using a combination of advanced on-chip designs, these objectionable sounds are reduced to virtually zero on the LDS9505 and LDS9504.

Low systems cost

The LDS9505 and LDS9504 have ground-centered outputs that require no output capacitors. This reduces systems cost and board space, while dramatically increasing bass response. Using integrated charge pump circuitry to bias the headphone sleeve to true ground eliminates ground-loop issues that can occur when connecting the output to devices other than headphones, such as audio docking stations.

Highly Flexible Features

--  Volume control
    The LDS9505 includes a 64 step audio-taper volume control (-59.5dB to
    +4dB). The LDS9504 implements convenient pin-selectable fixed gains.
--  Control interface
    An I2C interface controls all device functions including low-power
    standby, independent headphone mute/enable, headphone mono/stereo,
    differential or BTL output modes, and a high impedance output. The I2C
    registers can also be read to verify programming and headphone
--  Direct Battery Connection
    An integrated LDO allows direct connection to Li-ION batteries and a
    PSRR (power supply rejection ratio) of over 100dB to effectively
    eliminate GSM phone interference.

Price, Packaging and Availability

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 ultra-small chip-resistant Super-CSP™ 1.8mm x 2.3mm packaging. Samples are available today, with mass production quantities available Q3 2008. An evaluation board with easy-to-use control software is also available to reduce engineering design-in effort.

About Leadis Technology

Leadis Technology, Inc., headquartered in Sunnyvale, California, designs, develops and markets analog and mixed-signal semiconductors that enable and enhance the features and capabilities of mobile and consumer electronics devices. Leadis' product offerings include color display drivers, which are critical components of displays used in mobile consumer electronic devices; LED drivers, which provide controlled levels of current required to drive light emitting diodes in diverse applications including mobile backlight units; and audio CODEC and FM transmitter ICs, which are integral components in mobile media players and their associated aftermarket accessories. Leadis currently supplies display drivers supporting the major small panel display technologies, including a-Si and LTPS TFT LCDs, color STN LCDs, and color OLED displays, LED drivers supporting mobile backlighting applications, and audio ICs supporting portable media players and aftermarket audio accessories.

Gmax and ARA are trademarks of Leadis Technology, Inc.

All other trademarks belong to their respective owners.

For more information, visit

Certain statements in this press release including, but not limited to, the features and benefits of Leadis' new LDS9505 and LDS9504 headphone amplifiers and the anticipated market adoption of these products are forward-looking statements that are subject to risks and uncertainties that could cause results to be materially different than expectations. Such risks and uncertainties include, but are not limited to, lack of market adoption for the LDS9505 and LDS9504, delays in ramping these new products into production, delays in the integration of our products into consumer electronic devices, that pending patent applications will not result in issued patents or that any issued patents may not be sufficiently broad to protect our proprietary technologies, our reliance on third-party manufacturers, general portable electronics and semiconductor industry trends, and other risks detailed from time to time in Leadis' reports filed with the Securities and Exchange Commission including its Form 10-K for the year ended December 31, 2007. Leadis disclaims any obligation to update these forward-looking statements.

Contact Information

  • Contact Information:
    Tracy Lam
    Director, World-Wide Marketing Communications
    Leadis International Ltd.
    Tel: 852-21528880