Apparently designed to compete with the HD-DVD format
backed by NEC and Toshiba, it may be coming to a
computer near you sometime in 2005.
Driven by blue laser diode technology, the Blue-ray
Disc provides storage of 25 GB on a single-layer disk or 50
GB on a dual-layer one. The 12 cm diameter is the same
size as a CD/DVD and it offers transfer rates of 36 Mbps.
Key applications include recording and playback of high
definition video (for which one disk can provide up to four
hours of HDTV), but it is also applicable to PC data
storage. For details, you can visit the Blue-ray Founders’
website at www.blu-raydisc-official.org
Circuits and Devices
Single-Chip Car Radio Announced
Royal Philips Electronics ( www.semiconductors.
com) recently introduced a family of one-chip
analog car radio solutions that promise superior tuning
performance and reduced overall system costs in factory-installed automobile radios.
By combining Philips’ front-end tuning and analog
signal processing technologies, the TEF690x chips are
said to reduce the number of external components needed
to build high performance car radios and simplify the
design process to reduce system costs by 20 to 30 percent
as compared to existing two-chip systems.
The TEF690x devices include an AM/FM tuner, stereo
decoder, adaptive IF bandwidth control, precision
adjacent-channel suppression (PACS), and advanced
weak signal processing. In addition, the devices offer
flexible input selection and the option of an integrated
RDS demodulator and/or the connection of an external
sound processor or navigation/beep input. This variable
feature set enables car radio manufacturers to serve
worldwide markets in Asia, Europe, and the US with a
The devices are sampling now, with mass production
to begin in 2005. Four different devices will be available,
including the TEF6902 — which incorporates all the
standard features of the TEF690x range into a 64-pin
package — and the TEF6901 — which will also feature an
integrated RDS demodulator in a 64-pin package. Philips’
TEF6903 (with an integrated RDS demodulator) and the
TEF6904 will include external processor I/0 and will be
available in 80-pin packaging. Pricing was not disclosed as
of press time.
Laser Diode Driver Improves Optical Drives
NUTS & VOLTS
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National’s LMH6533 is geared
for higher performance DVD
and CD drives. Courtesy of
National Semiconductor Corp.
has announced a new
laser diode driver
(LDD) for use in optical
pickup units (OPUs).
The LMH6533 offers
fast switching rates,
very low output current
noise, and low
The reduced power
consumption provides better heat dissipation in the
system, while the low noise improves read times for optical
disk drives. The LMH6533 is designed for combination
DVD/CD recorder optical storage devices used in desktop,
notebook, and consumer DVD video recorders.
The LMH6533 laser diode driver contains two high
current outputs for reading and writing DVD (650 nm) or
CD (780 nm) lasers. It achieves read, write, and erase
functions through four separate switched current channels.
The LVDS interface delivers DVD write speeds of 16x and
higher while minimizing noise and crosstalk. The device
provides one 300 mA and two 150 mA write channels,
plus a 150 mA read channel.
Additionally, it minimizes electromagnetic interference
(EMI), allowing disk drive manufacturers to develop
devices without the extra cost of shielding. Available in
LLP- 28 packaging, the device is priced at $0.85 in high
Circle #105 on the Reader Service Card.