Friday, January 18, 2008

Clare Introduces Next Addition to Growing Family of DC-Termination ICs for ADSL/VDSL

Clare Introduces Next Addition to Growing Family of DC-Termination ICs for
ADSL/VDSL Applications

The CPC1466 is used in ADSL/VDSL Customer Premise Equipment (CPE)
to terminate the DC current of DSL twisted-pair copper lines without
telephone voice services
BEVERLY, Mass.--(Business Wire)--Clare, Inc., a wholly owned subsidiary of
IXYS Corporation
(NASDAQ:IXYS), today announced that it is in full production with the
CPC1466 DC-termination IC for ADSL and VDSL CPE applications such as
broadband modems and leased-line equipment. The CPC1466 has the DC
termination functionality necessary to complete the path for wetting
current specified by ITU-T G.992.3. The IC also includes an integrated
current limit feature and detect output that indicates wetting current
is being applied.

The CPC1466 provides a polarity-insensitive DC termination for
wetting current and a recognizable signature for MLT and SARTS
systems. The part has excellent linearity, 70dB typical, to minimize
harmonic distortion associated with its AC impedance and has
well-controlled turn-on and turn-off characteristics to minimize
impulse noise and generation of in-band signal energy into the DSL
channel. Since it interfaces with the tip/ring pair, it is has a
maximum rating of 300V to handle power cross and lightning transients.
These ICs are manufactured on Clare's proven 320V Silicon-On-Insulator
(SOI) process and packaged in a 16 pin SOIC or MLP.

Wetting current, also known as loop sealing current, is a
low-level DC current (usually less than 20 mA) applied to a loop for
the specific purpose of maintaining cable splice integrity by
preventing the build-up of oxidation. The wetting current mainly
addresses all-digital services, unlike services with underlying POTS
(Plain Old Telephone Service) that inherently provide loop current
while off-hook. In addition, service providers have the option of
providing ADSL2+ broadband services to customers without POTS and meet
the requirement for wetting current. With many service providers
implementing ADSL2+ and VDSL, service growth in the symmetrical
high-speed market is up 50% since 2003.

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