Philips CD-i 220 - Perhaps Also a High End CD Player ?

CD-i Player Audio Section
The Philips CD-i was the first CD based movie and game unit. Before PC CD-ROMs and the PlayStation. It was so ahead of the curve at the time. Philips was a major consumer electronics innovator.

Present in the player's audio section, the Crystal CS4328 was a well regarded Digital to Analog converter in the early 90s. A number of high end CD players used it, for example the Quad CD-67 from 1993. The CD-67 retailed at 795GBP and used a Philips CD transport mechanism.

The CS4328 is a high performance 18 bit DAC and the AD7528s shown are dual 8 bit DACs. The K version of the CS4328 shown here is the -93dB typical (-90dB max) higher THD+N spec version. SNR is 120dB min. Power supply filtering is good on the device with tantalum and surface mount ceramic capacitors in parallel on the +/-5V analog supplies and +5V digital supply.

If you look at the service manual schematics there are different player options. One uses the Philips SAA7321 Bitstream DAC and the other uses the CS4328.

It looks like the AD7528s were used as Attenuators/Mixers for the inclusion of MPEG audio from the Full Motion Video cartridge accessory. At least that's what I've taken from the schematics.


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