OKI Unveils Speaker Amplifier LSI Samples for Portable Devices
Offers ample volume with small speakers
ML2620
Tokyo, Japan, August 30, 2007 -- Oki Electric Industry Co., Ltd. (TSE: 6703) today unveiled samples of a speaker amplifier LSI that are best used in small and thin portable devices. The ML2620 adopts OKI's proprietary signal processing technology, and with speakers a mere 10mm-20mm in diameter, it can replay music with approximately twice the volume of conventional OKI models. It can also correct the volume and sound quality to optimum them for each device as it extracts the parameter for acoustic-effect characteristics. This LSI will be shipped in volume from December 2007.
"As portable devices such as mobile phones and portable TVs have limitations as to speaker size and acoustic space (the solid content of the device required for air oscillation), it has been difficult to replay music and TV broadcasts at a louder volume with rich bass tone. On the other hand, when replaying programs that require a wide range of volume, there were cases where the sound would damage the speaker when the volume got too loud," said Masahiko Morioka, President of Silicon Solutions Company at Oki Electric Industry. "Responding to these situations, OKI developed the ML2620 speaker amplifier LSI with a built-in circuit developed by OKI that makes corrections to optimize volume and sound quality even in small speakers of 10mm-20mm diameter. OKI will continue to enhance its lineup for sound LSIs to develop and provide chips that can express rich sound in various applications."
For more information on OKI's sound LSI's products and technologies, please refer to:
http://www.okisemi.com/en/topics/onsei_lsi/index.html
Features of ML2620
- Ensures ample sound volume with a small speaker
- Using OKI's proprietary signal processing technology, the LSI has a built-in circuit that can replay loud volume with a small speaker.
- Corrects acoustic characteristics
- Acoustic characteristics differ depending on the size of the portable device. To replay a high sound quality, it is necessary to correct the difference of acoustic characteristics depending on the device. OKI's LSI enables various acoustic parameters to be set, enabling to replay at optimum volume and sound quality.
- Include AGC (Automatic Gain Control) circuit
- Amplification is automatically controlled with the built-in AGC circuit. Soft sounds are replayed loud enough for clarity while loud sounds that could damage the speaker are replayed more softly.
- Fade-in fade-out functions
- The LSI can automatically change the volume one step at a time; from silent to the specified volume; from the current volume to silent; or from the current volume to the specified volume. This enables a more natural volume control.
- Adopts ultra small packaging W-CSP (Wafer level Chip Size Packaging)
- By adopting OKI's ultra small W-CSP technology to package the chip in the size as the actual chip, the ML2620 achieves a package size level of 2.54mm x 2.42mm. OKI also plans to provide the chip in 4mm x 4mm 20pin QFN as well.
Reference
About Oki Electric Industry Co., Ltd.
Founded in 1881, Oki Electric Industry Co., Ltd. is Japan's first telecommunications manufacturer, with its headquarters in Tokyo, Japan. OKI provides top-quality products, technologies and solutions to its customers through its info-telecom system business, semiconductor business and printer business. All three businesses function as a collective force to create exciting new products and technologies that satisfy a spectrum of customer needs in various markets. Visit OKI's global web site at http://www.oki.com/.
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