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News

Audio Codec reduces power supply noise over radio transmitters

Oki Electric Industry : 07 July, 2008  (New Product)
Small scale Codec from Oki Electric developed for radio systems to reduce noise levels during transmission
Oki Electric Industry has started shipping samples of its 16-bit monaural audio CODEC LSI, ML26123, which is suitable for audio recording and playback for portable devices. The power supply rejection ratio (PSRR) is improved significantly by the inclusion of an internal power regulator, thus the ML26123 can deliver stable audio performance without being affected by noise from the power supply circuit and peripheral components. The device also includes a composite video signal output, which can be applied to various portable device requirements. Volume shipment is planned from October 2008.

Portable devices such as digital camcorders are becoming smaller in size, which limits the board size for components. Thus, the audio LSI that processes very small signals must be located close to LSIs having large current fluctuation. As a result, noise from the power supply rails that are not properly regulated is introduced at the microphone amplifier during recording. This noise cannot be removed with only the noise reduction notch filter included in previous models.

"We developed this audio CODEC LSI, ML26123, to solve the issues of noise coming through the power supply. The ML26123 has an internal power regulator to improve the analog circuit characteristics, which can be easily affected by power supply noise," said Hiroshi Enomoto, President of Silicon Solutions Company at Oki. "We will continue to offer sound LSI products, such as audio DAC LSIs for small speaker systems, to enable rich sound for small-and-slim personal and mobile applications."

The ML26123 achieves PSRR of over 90dB (500 times more than previous models) and offers reliable audio performance without being affected by the power supply or packaging condition. In addition, by applying Oki's ultra small packaging technology, Oki succeeded in offering all this capability in a mere 2.56mm×2.46mm size.
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