GENERAL DESCRIPTION

The SAA7327 (CD7 II) is a single chip combining the functions of a CD decoder, digital servo and bitstream DAC, especially designed for Video CD applications. The decoder/servo part is based on the SAA737x (CD7) and is software compatible with this design. Extra functions are controlled by use of ‘shadow’ registers (see Section 7.15.3).

FEATURES

• Integrated bitstream DAC with differential outputs, operating at 96fs with 3rd order noise shaper; typical performance of −95 dB signal-to-noise ratio (EIAJ A-weighted)

• Separate serial input and output interfaces allow data ‘loopback’ mode for use of onboard DAC as stand-alone DAC for digital audio signals

• Up to 2 times speed mode

• Lock-to-disc mode

• Full error correction strategy, t = 2 and e = 4

• Full subcode (CD graphics) interface

• All standard decoder functions implemented digitally on chip

• FIFO overflow concealment for rotational shock resistance

• Digital audio interface (EBU), audio and data

• 2 and 4 times oversampling integrated digital filter, including fs mode

• Audio data peak level detection

• Kill interface for external DAC deactivation during digital silence

• All SAA737x (CD7) digital servo and high-level functions

• Low focus noise

• Improved playability performance

• Automatic closed-loop gain control available for focus and radial loops

• Pulsed sledge support

• Electronic damping of fast radial actuator during long jump

• Microcontroller loading LOW

• High-level servo control option

• High-level mechanism monitor

• Communication may be via TDA1301/SAA7345 compatible bus or I2C-bus

• On-chip clock multiplier allows the use of 8.4672, 16.9344 or 33.8688 MHz crystals or ceramic resonators.