參數(shù)資料
型號(hào)： SAF7847HL
廠商： NXP SEMICONDUCTORS
元件分類： 顏色信號(hào)轉(zhuǎn)換
英文描述： One chip CD audio device with integrated MP3-WMA decoder
中文描述： COLOR SIGNAL DECODER, PQFP144
封裝： 20 X 20 MM, 1.40 MM HEIGHT, SOT486-1, MS-026, PLASTIC, QFP-144
文件頁(yè)數(shù)： 52/93頁(yè)
文件大?。?/td> 396K
代理商： SAF7847HL
SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
52 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
6.6.3
Signal conditioning
The digital codes retrieved from the ADC and PDM generator are applied to logic circuitry
to obtain the various control signals. The signals from the central aperture diodes are
processed to obtain a normalized focus error signal.
(8)
where the detector setup is assumed to be as shown in
Figure 29
.
For the single foucault focusing method, the signal conditioning can be switched under
software control such that the signal processing is as follows:
(9)
The error signal, FE
n
, is further processed by a Proportional-Integral and Differential (PID)
filter section.
An internal flag is generated by means of the central aperture signal and an adjustable
reference level. This signal is used to provide extra protection for the Track Loss (TL)
generation, the focus start-up procedure and the dropout detection.
The radial or tracking error signal is generated by the satellite detector signals R1 and R2.
The radial error signal can be formulated as follows:
RE
s
= (R1
R2)
×
re_gain + (R1 + R2)
×
re_offset
where the index ‘s’ indicates the automatic scaling operation which is performed on the
radial error signal. This scaling is necessary to avoid non-optimum dynamic range usage
in the digital representation and reduces the radial bandwidth spread. Furthermore, the
radial error signal will be made free from offset during start-up of the disc.
The four signals from the central aperture detectors, together with the satellite detector
signals generate a Track Position Indicator signal (TPI) which can be formulated as
follows:
TPI = sign [(D1 + D2 + D3 + D4)
(R1 + R2)
×
sum_gain]
where the weighting factor sum_gain is generated internally by the SAF784x during
initialization.
FEn
D1
D1
D2
D2
–
+
---------------------
D3
D3
D4
+
------------D4
–
=
FEn
2
D1
D1
D2
+
--------------D2
×
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
SAF82520PVB2 制造商:SIEMENS 功能描述:New
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