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.