參數(shù)資料
型號(hào)： SAF7846HL
廠商： NXP Semiconductors N.V.
元件分類： 存儲(chǔ)器
英文描述： One chip CD audio device with integrated MP3-WMA decoder
封裝： SAF7843HL/M295<SOT486-1 (LQFP144)|<<http://www.nxp.com/packages/SOT486-1.html<1<Always Pb-free,;SAF7849HL/M245<SOT486-1 (LQFP144)|<<http://www.nxp.com/packages/SOT486-1.h
文件頁(yè)數(shù)： 59/93頁(yè)
文件大?。?/td> 396K
代理商： SAF7846HL
SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
59 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
These signals can have uncertainties caused by:
Disc defects such as scratches and fingerprints
The HF information on the disc; which is considered as noise by the detector signals
In order to determine the spot position with sufficient accuracy, extra conditions are
necessary to generate a Track Loss (TL) signal and an off-track counter value. These
extra conditions influence the maximum speed and this implies that, internally, one of the
following three counting states is selected:
Protected state: used in normal play situations; a good protection against false
detection caused by disc defects is important in this state.
Slow counting state: used in low-velocity track jump situations; in this state a fast
response is important rather than the protection against disc defects (if the phase
relationship between TL and RP of
1
2
p radians is affected too much, the direction
cannot then be determined accurately).
Fast counting state: used in high-velocity track jump situations; highest obtainable
velocity is the most important feature in this state.
6.6.8
Defect detection
A defect detection circuit is incorporated into the SAF784x. If a defect is detected, the
radial and focus error signals may be zeroed, resulting in better playability. The defect
detector can be switched off, applied only to focus control or applied to both focus and
radial controls under software control (part of foc_parm1).
The defect detector has programmable set points selectable by the parameter
defect_parm.
6.6.9
Off-track detection
During active radial tracking, off-track detection is realized by continuously monitoring the
off-track counter value. The off-track flag becomes valid whenever the off-track counter
value is not equal to zero. Depending on the type of extended S-curve, the off-track
counter is reset after 0.75 track extend mode, or at the original track in the 2.25 track
extend mode.
6.6.10
High level features
6.6.10.1
Automatic error handling
Three watchdogs are present:
Focus: detects focus dropout of longer than 3 ms, sets focus lost interrupt, switches
off radial and sledge servos, and disables drive to disc motor
Fig 34. Defect detector block diagram
001aag345
DECIMATION
FILTER
DEFECT
GENERATION
FAST
FILTER
SLOW
FILTER
PROGRAMMABLE
HOLD-OFF
defect
output
satellite 1
satellite 2
+
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAF7846HL/M210,557 功能描述:音頻 DSP 1 chip CD Audio Dev w/Integrated decoder RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
SAF7847HL/M201,557 功能描述:音頻 DSP 1 chip CD Audio Dev w/Integrated decoder RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
SAF7849HL/M245,557 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
SAF7849HL/M295,557 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
SAF7860HL/M2,557 制造商:NXP Semiconductors 功能描述:DSP
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