SAA7715 Datasheet, PDF (3/36 Pages) NXP Semiconductors – Digital Signal Processor

Philips Semiconductors
Digital Signal Processor
Preliminary specification
SAA7715H
1 FEATURES
1.1 Hardware
• 24-bit Philips 70 MIPS DSP core (24-bit data path and
12/24-bit coefficient path)
• 1.5 kbyte of downloadable DSP program memory
(PRAM)
• 2 kbyte of DSP program memory (PROM)
• 2.5 kbyte of re-programmable DSP data memory
(XRAM)
• 512 byte of re-programmable DSP coefficient memory
(YRAM)
• Four stereo digital serial inputs (8 channels) with
common BCK and WS. To these inputs the I²S-bus
format or LSB-justified formats can be applied
• One stereo bitstream DAC (2 channels) with 64 fold
oversampling and noise shaping
• Selectable clock output (pin SYSCLK) for external slave
devices (512f_s to 128f_s)
• Four stereo digital serial outputs (8 channels) with
selectable I²S-bus or LSB-justified format
• Two SPDIF inputs combined with digital serial input
• On-board WS_PLL generates clock for on-board DAC
and output pin SYSCLK
• I²C-bus controlled (including fast mode)
• Programmable Phase-Locked Loop (PLL) derives the
clock for the DSP from the CLK_IN input
• −40 to +85 °C operating temperature range
• supply voltage only 3.3 V
• All digital inputs are tolerant for 5 V input levels
• Power-down mode for low current consumption in
standby mode
• Optimized pinning for applications with other Philips
DACs (such as UDA1334, UDA1355 and UDA1328).
1.2 Possible firmware
• Dolby®⁽¹⁾ Pro Logic decoding
• Smoothed volume control (without zipper noise)
• Automatic Volume Levelling (AVL)
• Dynamic bass enhancement
• Ultra bass
(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.
• Incredible surround
• Incredible mono (Imono)
• DPL virtualiser
• Dolby digital virtualiser (DVD post-processing)
• Dynamic compressor
• Spectral enhancer
• Equalizer with peaking/shelving filters
• DC filters
• Bass/treble control
• Dynamic loudness
• Tone/noise generator
• Graphical spectrum analyser
• Configurable Delay Unit (DLU)
• Sound steering/elevation for CAR applications
• Sample Rate Conversion (SRC).
2 APPLICATIONS
• As co-processor for a car radio DSP in a car radio
application for additional acoustic enhancements
(sound steering/sound elevation/signal processing)
• Multichannel audio: in DVD and Home theatre
applications as post-processing device like signal
virtualisation (virtual 3D surround) and acoustic
enhancement, tone control, volume control and
equalizers
• Multichannel decoding: Dolby Pro Logic and virtual
3D surround
• PC/USB audio applications: stereo widening (Incredible
surround), sound steering, sound positioning and
speaker equalization.
2001 May 07
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