SAA7826HL/M1A,557

Encoders, Decoders, Converters Overview

The SAA7826HL/M1A,557 is a CD audio decoder IC integrating digital servo processing and a filterless DAC with pre-amplifier and laser control. It operates at 1x, 2x, and 4x speeds using an internal PLL clock multiplier with an 8.4672 MHz crystal. The device features six oversampling bitstream ADCs for LF signals and an adaptive data slicer for HF data. Key electrical parameters include a digital supply voltage (VDDD) of 1.65 V to 1.95 V and an analog supply voltage (VDDA) of 3.0 V to 3.6 V. Operating temperature ranges from -40 °C to +85 °C. The onboard DAC delivers 90 dB A-weighted Signal-to-Noise Ratio and -80 dB THD+N.

Encoders, Decoders, Converters Feature Summary

• Integrates CD audio decoding, digital servo control, and laser management in a single package to reduce external component count.
• Features an adaptive high-frequency data slicer and on-chip buffering for optimized diode signal processing.
• Includes a dynamic element matching digital-to-analog converter requiring minimal external components.
• Supports lock-to-disc mode for electronic shock absorption and variable input data rates.

Encoders, Decoders, Converters Applications

• Compact Disc players
• CD-ROM drives
• Audio decoders

Encoders, Decoders, Converters Procurement Notes

Verify the specific ordering suffix M1A,557 against current NXP documentation to confirm availability status. This component may be discontinued or subject to last-time buy restrictions. Confirm RoHS compliance requirements as original specifications indicate non-compliance with certain directives. Ensure the LQFP-80 package footprint matches the target PCB design before procurement.

Encoders, Decoders, Converters Selection Notes

Select this component for applications requiring integrated laser control and servo functions alongside audio decoding. The M1 version specifically includes EBU mute functionality while maintaining SPDIF frame structure. Verify compatibility with the host microcontroller interface, supporting both I2C-bus and 4-wire modes. Ensure the system design accommodates the required 8.4672 MHz crystal frequency for proper clock generation.

Encoders, Decoders, Converters Part Context

The SAA7826 combines the functionality of the SAA732X decoder with the pre-amplifier and laser control previously found in the TZA102X IC. This integration reduces the Bill Of Material (BOM). The M1 variant adds specific EBU mute capabilities compared to the standard M0 version. The device maintains software compatibility with the SAA732X through similar register structures.

Encoders, Decoders, Converters Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The SAA7826 supersedes earlier designs like the SAA732X but no direct modern replacements are listed.

Encoders, Decoders, Converters FAQ

What is the function of the M1 version regarding the EBU interface?

The M1 version includes an EBU mute function that allows independent muting of data transmitted over the EBU interface while maintaining the SPDIF frame structure.

How does the SAA7826 handle DC offsets in photo-diode signals?

The device measures unwanted DC offsets arising from leakage or OPU imperfections and minimizes them via selectable cancellation registers and shadow register controls.

What operating speeds are supported by the decoder part?

The decoder supports single-speed (n=1), double-speed (n=2), and quad-speed (n=4) operation, controlled via decoder registers.