SAA7806

General description

The SAA7806, is a single chip solution CD audio decoder, digital servo, audio DAC, pre-amp, laser driver and integrated ARM7TDMI-S microcontroller, targeted at automotive CD applications. The channel decoder design is derived from the SAA7817 DVD decoder IC, with optimization and design improvements specifically for CD audio (e.g. improved CD playability). The digital servo, analog pre-amp, laser driver and audio DAC blocks are improved designs based on the SAA7824 CD decoder IC. Further architectural enhancements to the design have been made to integrate system functionality and reduce the system cost of ownership. The SAA7806 IC supports a generic architecture that will form the basis of future variants in the SAA7806 IC family optimized for different CD applications.

Features

Hardware features

• Channel decoder based on SAA7817 IC design
• Digital servo based on SAA7824 IC design
• 32-bit embedded ARM7 RISC microcontroller supporting both 32-bit and 16-bit Thumb instruction sets
• Mask programmed internal program ROM for microcontroller
• Register structure redesigned to utilize the complete 32-bit bandwidth of the integrated microcontroller bus architecture
• Programmable clock frequency for ARM microcontroller - allowing users to trade-off power consumption and processing power depending on requirements
• Microcontroller access to digital representations of the diode input signals from the optical pick up; the microcontroller can also generate the servo output signals RA, FO, SL and allows the possibility of additional servo algorithms or a complete servo implementation in software
• Microcontroller access to audio streams; both from the internal CD decoder and an external stereo auxiliary input (e.g. an analog source from a tuner; converted to digital via on-chip ADCs) to allow audio processing algorithms in the ARM microcontroller; e.g. bass boost and volume control
• Two general purpose analog inputs (A_IN_1 and A_IN_2) allowing the ARM microcontroller access to other external analog signals; e.g. low cost keypad; temperature sensor; via on-chip ADCs
• Two analog inputs for external audio sources (e.g. tuner) which can be accessed by the ARM for audio processing
• Slave I²S-bus mode in which the channel decoder can synchronize the CD playback speed to an input I²S-bus clock
• Integrated digital HF/mirror detector with measurement of minimum and maximum peak values, amplitude and offset
• Integrated LCD controller/driver (pins multiplexed with General Purpose Input/Outputs (GPIOs)
• Integrated CD-TEXT decoder
• 1 x 2 x 4 x or 6 x decode speed, CLV or CAV modes
• QFP100 package with 0.65 mm pin pitch
• Separate left and right channel digital silence detect available on KILL pins
• Digital silence detection available on loopback data from external source as well as internal data
• 'Filterless' pseudo-bitstream audio DAC; THD = -80 dB and S/N = 90 dB; with minimal external components
• Separate line and headphone outputs for audio DAC
• Selectable quiescent current for headphone buffers - allows users to choose between low-power consumption or lower distortion performance
• Loop back mode allowing the use of integrated DAC with external I²S-bus/EIAJ sources
• Compatible with voltage mode mechanisms
• On-chip buffering and filtering of the diode signals from the mechanism in order to optimize the signals for the decoder and servo parts
• LF (servo) signals converted to digital representations by sigma-delta ADCs shared between pairs of channels to minimize DC offset between channels
• HF part summed from signals D1 to D4 and converted to digital signals by HF 6-bit ADC
• Digitally controlled selectable DC offset cancellation of quiescent mechanism voltages and dark currents; additional fine DC offset cancellation in digital domain
• Eye pattern monitor system to observe selectable points within the analog preamplifier
• Current and average jitter values available via registers
• On-chip laser power control; up to maximum currents of 120 mA
• Laser on-off control; including 'soft' start control - zero to nominal output power in 1 ms
• Monitor control and feedback circuit to maintain nominal output power throughout the life of laser
• Configured for Nsub monitor diode
• Debug version for code development and debug in LQFP100 multi chip module, with internal flash ROM and SRAM (for fast code access) programmed via JTAG interface
• JTAG interface for device access and ARM code development (compatible with ARM multi-ICE)
• All digital input pins 5 V tolerant.

Read formats

• CD-R
• CD-RW
• CD-DA (red book)
• CD-ROM.

Products/packages

Pricing/ordering/availability

Parametrics/similar products

Similar products

SAA7806 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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