SAA7706H: Car radio Digital Signal Processor (DSP) ARCHIVED

Hardware

• 5-bitstream 3rd-order sigma-delta Analog-to-Digital Converters (ADCs) with anti-aliasing broadband input filter
• 1-bitstream 1st-order sigma-delta ADC with anti-aliasing broadband input filter
• 4-bitstream Digital-to-Analog Converters (DACs) with 128-fold oversampling and noise shaping
• Integrated semi-digital filter; no external post filter required for DAC
• Dual media support: allowing separate front-seat and rear-seat signal sources and separate control
• Simultaneous radio and audio processing
• Digital FM stereo decoder
• Digital FM interference suppression
• RDS demodulation via separate ADC; with buffered output option
• Two mono Common-Mode Rejection Ratio (CMRR) input stages for voice signals from phone and navigation inputs
• Phone and navigation mixing at DAC front outputs
• Two stereo CMRR input stages (CD-walkman and CD-changer etc.)
• Analog single-ended TAPE and AUX input
• Separate AM-left and AM-right inputs in the event of use of external AM stereo decoder
• One digital input: I²S-bus or LSB-justified format
• Two digital inputs: SPDIF format
• Co-DSP support via I²S-bus or LSB-justified format
• Audio output short-circuit protected
• I²C-bus controlled (including fast mode)
• MOST bus interfacing (details in separate manual)
• Phase-locked loop derives the internal clocks from one common fundamental crystal oscillator
• Combined AM/FM level input
• Pin compatible with SAA7705 and SAA7708
• All digital inputs are tolerant of 5 V input levels
• All analog inputs have high GSM immunity
• Low number of external components required
• -40 to +85 Cel operating temperature range
• Easy applicable.

Software

• Improved FM weak signal processing
• Integrated 19 kHz MPX filter; de-emphasis and stereo detection
• Electronic adjustments: FM or AM level, FM channel separation, Dolby ¹) level
• Baseband audio processing (treble, bass, balance, fader and volume)
• Four channel 5-band parametric equalizer
• 9-bands mono audio spectrum analyzer
• Extended beep functions with tone sequencer for phone rings
• Large volume jumps e-power interpolated to prevent zipper noise
• Dual media support; allowing separate front-seat and rear-seat signal sources and separate control
• Dynamic loudness or bass boost
• Audio level monitor
• Tape equalization and Music Search System (MSS) detection for tape
• Dolby-B tape noise reduction (at 44.1 kHz only)
• Dynamics compression available in all modes
• CD de-emphasis processing
• Voice-over possibility for phone and navigation signals
• Improved AM signal processing
• Digital AM CQUAM stereo decoder (not in all rom_codes available)
• Digital AM interference suppression
• Soft audio mute
• RDS update processing: pause detection, mute and signal-quality sensor-freeze
• General purpose tone generator
• Noise generator allows for frequency response measurements
• Boot-up ROM for fast start-up
• Signal level, noise and multipath detection for AM or FM signal quality information
• AM co-channel and adjacent channel detection (not in all rom_codes available).

¹) Dolby - Available only to licensees of Dolby Laboratories Licensing Corporation, San Francisco, CA94111, USA, from whom licensing and application information must be obtained. Dolby is a registered trade-mark of Dolby Laboratories Licensing Corporation.

• High-end car radio systems.