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SAA7706H

Car radio Digital Signal Processor (DSP)

Philips Electronics 

Philips Semiconductors

Car radio Digital Signal Processor (DSP)

Product specification

SAA7706H

1 FEATURES

1.1 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 °C operating temperature range

• Easy applicable.

1.2 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

(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.

2001 Mar 05

3

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