OKI Starts Shipping Samples of Audio CODEC LSI That Is Resistant to Power Supply Noise
Achieves Power Supply Rejection Ratio of Over 90dB by Including
Internal Power Regulator
TOKYO--(Business Wire)--
Oki Electric Industry Co., Ltd. (TOKYO:6703) today announced it
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 2.56mmx2.46mm size.
(Features of ML26123)
Offers stable audio performance without being affected by power
supply noise
The LSI includes an internal power regulator for the CODEC to
achieve stable recording and playback condition even in a poor power
supply conditions.
Ultra small packaging technology
By applying W-CSP (Wafer level Chip Size Package), OKI's ultra
small packaging technology, the LSI could be packaged in a size of
2.56mm x 2.46mm. The LSI is also available in the 5mmx5mm 32pin QFN
format.
Acoustic functions suitable for portable devices
The LSI includes three types of acoustic functions to achieve
high-sound quality recording for portable devices:
1. Five-band noise reduction notch filter
This is a filter to reduce noise from a particular frequency
during recording. The noise frequency can be set as desired.
2. Five-band programmable equalizer
This is an equalizer to correct acoustics during playback.
Equalizer features can be set as desired.
3. High-pass filter for wind noise reduction
This high-pass filter is designed to reduce wind noise when
recording with portable devices. The LSI has functionality that is
more advanced than former models with wind noise filtering, and users
can select eight types of cut-off frequency and first order or second
order filter option.
Video amplifier included for AV output
The LSI includes a composite video signal output to connect with
the AV output terminal of portable devices. While an external
capacitor larger than the LSI itself was required for video output in
conventional products, this ML26123 does not require such a capacitor.
Therefore, the number of external components is reduced as well as the
device cost and necessary packaging space.
Built-in digital microphone interface
With digital microphones, a circuit internal to the microphone
digitalizes the voice signals. By including an interface for
connecting the digital microphone, noise along the signal path does
not affect the input signal, since it's a digital signal, even when
the microphone and audio CODEC are separated by some distance.
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/.
Notes:
-- Names of companies and products are trademarks or registered
trademarks of the respective companies and organizations.
Oki Electric Industry Co., Ltd.
For Europe and Americas:
Naomi Takeuchi, +1-408-737-6279
Public Relations Division
press@oki.com
or
For Asia and Other Areas:
Akiko Horiguchi, +81-3-3580-8950
Public Relations Division
press@oki.com
Copyright Business Wire 2008
