|
From
CDM12 Industrial to CD-Pro2LF ... |
|
The CDM12
Industrial was actually the first generation
of professional modules to include a heavy
die-cast metal frame. It rapidly met a big
success in the audio/video industry.
|
|
Indeed, the CDM12
Industrial module had a very successful life, particularly in two specialized
markets : in the high-end audio market, because of its excellent
ability to retrieve digital audio data and
because its
very good sound quality; in the jukebox market
too, because of its
robustness and reliability.
|
|
The CD-Pro and
CD-Pro2 correspond to the
next generations in terms of electronics. They are of course pin-to-pin
compatible with the CDM12 Industrial. The main difference lies in the type
of decoding device which is used in the application : the CDM12 Industrial (Premium 6000) includes the decoding chip SAA7345
(CD6) and the digital servo chip OQ8868 (DSICS). They are both replaced by
the single chip SAA7372 (CD7) in the CD-Pro application (Premium 7000) and
by the SAA7324 (CD10) in the CD-Pro2
application (Premium10501).
The CD7 and CD10 show better performances, especially thanks to their improved error
correction systems. Experience has also underlined that CD7 and CD10 are less
sensitive to ESD.
|
|
Other changes
brought to the CD-Pro and CD-Pro2 modules are the modification of the HF front end filter for improved
playability with out-of-specification discs, or the implementation of a single gear ratio for the
sledge movement instead of the previous 3/1 ratio, in order to bring
stable sledge movements.
|
|
Then comes the CD-Pro2M. Actually, this module is more an upgrade of
the CD-Pro2 than a new design in this range of
products.
|
|
The main
modification is the replacement of the laser
unit, which has resulted in changing the flex
assembly and the mounting frame as well. Of
course, the new light pen can still read
CD-DA, CD-R and CD-RW recorded audio discs.
|
|
The TDA1305 D/A
Converter, which was used with all previous
modules, has been replaced in the CD-Pro2M by a
new generation 24-bit 192kHz DAC : the AK4384
chip from AKM.
|
|
The last
modification is the improvement of the
CD-Pro2M's firmware as regard to playability :
the CD-Pro2M will play back standard CD-DA
discs with an excellent playability, but it
will read copy-protected discs as well,
whatever the protection system which has been
implemented.
|
|
The CD-Pro2LF
has recently showed up, because of the RoHS
directive introduced on the 1st of July, 2006.
This directive concerns the restriction of
hazardous substances in all electronic
products sold in the European community, as
well as in several other countries worldwide.
The module has been modified to comply with
this directive, and has consequently been
renamed CD-Pro2LF (LF stands for "Lead
Free").
|
|
The CD-Pro2LF
includes all improvements brought with the
CD-Pro2M module, and it continues to offer an excellent reliability
and an unmatched playability (including with
copy-protected discs), in accordance
with the reputation of the CD-Pro family in
the high-end and professional markets.
|
|
Still, the
CD-Pro2LF
remains 100% compatible, electrically
and mechanically, with its predecessors
(CD-Pro2M, CD-Pro2, CD-Pro and CDM12 Industrial). In
other words, one should be able to replace a CDM12 Industrial module by a
CD-Pro2LF in its existing
application without any problem.
|
|
Grounding strategy has
however changed since the CDM12 Industrial. The analogue and digital grounds
were connected internally in the CDM12
Industrial Module. They are not
connected anymore in its successors for obvious sound quality
improvements. In order to optimize the performances of a
CD application based on the CD-Pro, CD-Pro2, CD-Pro2M and CD-Pro2LF modules, both grounds have consequently to be
connected on the user control board, in a strategic middle ground point.
|
|
Finally, all
these modules are
based on the standard DSA interface, and the same user software can consequently
be used with any of them.
|
|
For more
information, you can
download the application note ANVAU12540401 which
provides several other tips to improve the performances of a CD-Pro2LF
based application
(see the download section). |
