SAA7824

General description

This document covers versions M0 and M1 of the CD audio decoder IC.

The SAA7824 is a CD audio decoder IC which combines the function of the SAA732X IC with the pre-amplifier and laser control functions previously found in the TZA102X IC. The design is intended to reduce the external component count and hence the Bill Of Material (BOM).

Supply of this Compact Disc IC does not convey an implied license under any patent right to use this IC in any Compact Disc application.

Features

• Decoder and servo parts are based upon the SAA732X design (the original features are maintained)
• Software compatibility is maintained with the SAA732X by using a similar register structure (new features are controlled from new shadow registers)
• 1x, 2x and 4x speed
• LF (servo) signals converted to digital representations by 6 oversampling bitstream ADCs
• HF part summed from signals D1 to D4 and converted into a digital signal by a data slicer
• On-chip buffering and filtering of the diode signals from the mechanism for signal optimization
• Selectable DC offset cancellation of quiescent mechanism voltages and dark currents
• On-chip laser power control (up to 120 mA)
• Laser on/off control, including ?soft? start control (zero to nominal power in 1 ms)
• Monitor control and feedback circuit to maintain nominal output power throughout laser life
• Dynamic element matching DAC with minimum external components
• DAC performance of -80 dB Total Harmonic Distortion + Noise (THD + N) and 90 dB Signal-to-Noise Ratio (S/N) A-weighted
• Separate left and right channel digital silence detection available on the KILL pins
• Digital silence detection on internal data and loopback (external) data
• 5 versatile pins, 2 inputs and 3 outputs
• Integrated CD text decoder with separate microcontroller interface
• Dedicated 4 MHz or 12 MHz clock output for microcontroller (configurable)
• Configured for N-sub monitor diode
• On-chip clock multiplier allows the use of an 8.4672 MHz crystal or ceramic resonator
• The M1 version has an EBU mute function which allows independent muting of data being transmitted over the EBU interface whilst maintaining the SPDIF frame structure.

Products/packages

Quality/reliability/chemical content

Quality and reliability disclaimer

Pricing/ordering/availability

Block diagrams/pinning

Print / Email

• Print this information
• Email this information

Disclaimers

• General product disclaimer
• Quality and reliability disclaimer