參數(shù)資料
型號： SAA7335GP
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： DSP for CD and DVD-ROM systems
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-407-1, LQFP-100
文件頁數(shù)： 8/36頁
文件大?。?/td> 196K
代理商： SAA7335GP
1997 Aug 11
8
Philips Semiconductors
Preliminary specification
DSP for CD and DVD-ROM systems
SAA7335
FUNCTIONAL DESCRIPTION
Analog front-end
This block converts the HF input to the digital domain using
an 8-bit ADC proceeded by an AGC circuit to obtain the
optimum performance from the convertor. This block is
clocked by ADCCLK which is set by the external crystal
frequency plus a flexible clock multiplier and divider block.
PLL and bit detector
This subsystem recovers the data from the channel
stream. The block corrects asymmetry, performs noise
filtering and equalisation and finally recovers the bit clock
and data from the channel using a digital PLL.
The equalizer and the data slicer are programmable.
Digital logic
All the digital system logic is clocked from the master ADC
clock (ADCCLK) described above.
Advanced bit detector
The advanced bit detector offers improved data recovery
for multi-layer discs and contains two extra detection
circuits to increase the margins in the bit recovery block:
1.
Adaptive slicer: adds a second stage slicer with higher
bandwidth
2.
Run length 2 push-back: all T2 run lengths are pushed
back to T3, thereby automatically determining the
erroneous edge and shifting the transitions on that
edge.
Demodulator
F
RAME SYNC PROTECTION
CD
MODE
This circuit detects the frame synchronization signals.
Two synchronization counters are used in the SAA7335:
1.
The coincidence counter: this is used to detect the
coincidence of successive syncs. It generates a sync
coincidence signal if 2 syncs are 588
±
1 EFM clocks
apart.
The main counter: this is used to partition the EFM
signal into 17-bit words. This counter is reset when:
a) A sync coincidence is generated
b) A sync is found within
±
6 EFM clocks of its
expected position.
2.
The sync coincidence signal is also used to generate the
lock signal which will go active HIGH when 1 sync
coincidence is found. It will reset to LOW when, during
61 consecutive frames, no sync coincidence is found.
F
RAME SYNC PROTECTION
DVD
MODE
This circuit detects the frame synchronization signals.
Two synchronization counters are used in the SAA7335:
1.
The coincidence counter: this is used to detect the
coincidence of successive syncs. It generates a sync
coincidence signal if 2 syncs are 1488
±
3 EFM+
clocks apart.
2.
The main counter: this is used to partition the EFM+
signal into 16-bit words. This counter is reset when:
a) A sync coincidence is generated
b) A sync is found within
±
10 EFM+ clocks of its
expected position.
The sync coincidence signal is also used to generate the
lock signal which will go active HIGH when 1 sync
coincidence is found. It will reset to LOW when, during
61 consecutive frames, no sync coincidence is found.
EFM/EFM+ demodulation
The 14-bit EFM (16-bit EFM+) data and subcode words
are decoded into 8-bit symbols.
相關(guān)PDF資料
PDF描述
SAA7335 DSP for CD and DVD-ROM systems(在CD和DVD-ROM應(yīng)用中的DSP)
SAA7341 COMS Digital decoding IC for Compact Disc
SAA7341GP COMS Digital decoding IC for Compact Disc
SAA7345 Bitstream conversion ADC for digital audio systems
SAA7345GP Bitstream conversion ADC for digital audio systems
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7341 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:COMS Digital decoding IC for Compact Disc
SAA7341GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:COMS Digital decoding IC for Compact Disc
SAA7345 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Bitstream conversion ADC for digital audio systems
SAA7345GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Bitstream conversion ADC for digital audio systems
SAA7346 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Shock absorbing RAM addresser
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