參數(shù)資料
型號(hào)： SAF7843HL
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)： 27/93頁(yè)
文件大?。?/td> 396K
代理商： SAF7843HL
SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
27 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
The detection of a defect is based on amplitude. The amplitude is measured via a set of
peak detectors with decay, as described in
Section “Peak Detectors” on page 23
. The
decay bandwidth and noise filter bandwidth are programmed by register
DefectDetPeakBW.
Two thresholds can be programmed. A low threshold will trigger a ‘defect-detected’ signal
as soon as amplitude goes below this threshold. A high threshold will clear this
‘defect-detected’ signal again as soon as amplitude goes above this threshold. Together,
these thresholds apply a hysteresis to the defect detection, avoiding a jittery
‘defect-detected’ signal (having many on/off parts) when the amplitude is at the threshold
edge. Thresholds are programmed in register DefectDetThres.
The ‘defect-detected’ signal can be used to hold the PLL, slicer, AGC, AOC and HPF
during a defect. The feature(s) that will be held can be programmed in register
DefectDetEnables. The same register can be used, via software, to force the PLL, slicer
and HPF to hold. The AGC and AOC can be held in software by just disabling the loops in
register AGCAOCControl.
Two special features exist on the defect detector:
Optional delay of the enabling and disabling of hold features at the beginning and end
of a defect. This can be done by programming a start and/or stop delay (in number of
sysclks) via register DefectDetStartStopDelay. Whenever the defect detector detects
the start of a defect, it will wait for the start delay before triggering a ‘defect-detected
processed’ signal. When the defect detector detects the end of a defect, it will wait for
the programmed stop delay before clearing the defect-detected processed’ signal
again. This also means that defects which are smaller than the start delay are
ignored, and that if the defect contains zones with good RF amplitude but smaller than
the stop delay, they are also ignored. In reality, all hold features are triggered by the
defect-detected processed’ signal, rather than the ‘defect-detected’ signal; at the
decoder output, both delays are zero, so both signals are equal.
Optional programmable time-window at the end of a defect, during which, higher PLL
and/or slicer bandwidths can be used to speed up the recovery of these loops after a
defect. This window can be programmed via register DefectDetHighBWDelay.
Bandwidth programming is explained in
Section 6.5.5.2 on page 28
.
The detection of the beginning or end of a defect, with or without start and stop delays,
can be used to generate an interrupt. See register InterruptEnable1.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAF7843HL/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
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
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