參數(shù)資料
型號(hào)： SAA7327
廠商： NXP Semiconductors N.V.
英文描述： Digital servo processor and Compact Disc decoder with integrated DAC for video CD (CD7 II)(應(yīng)用于視頻CD的帶綜合數(shù)模轉(zhuǎn)換器（DAC）的數(shù)字伺服處理器和光盤譯碼器)
中文描述： 數(shù)字伺服處理器和光盤解碼器集成了用于視頻光盤（CD7抗原二）（應(yīng)用于視頻光碟的帶綜合數(shù)模轉(zhuǎn)換器（DAC）的的數(shù)字伺服處理器和光盤譯碼器援會(huì)）
文件頁數(shù)： 26/68頁
文件大小： 284K
代理商： SAA7327
2000 Jun 26
26
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC for video CD (CD7 II)
SAA7327
7.14
Servo part
7.14.1
D
IODE SIGNAL PROCESSING
The photo detector in conventional two-stage three-beam
Compact Disc systems normally contains six discrete
diodes. Four of these diodes (three for single foucault
systems) carry the Central Aperture signal (CA) while the
other two diodes (satellite diodes) carry the radial tracking
information. The CA signal is processed into an HF signal
(for the decoder function) and LF signal (information for
the focus servo loop) before it is supplied to the SAA7327.
The analog signals from the central and satellite diodes
are converted into a digital representation using
Analog-to-Digital Converters (ADCs).
The ADCs are designed to convert unipolar currents into a
digital code. The dynamic range of the input currents is
adjustable within a given range, which is dependent on the
value of the external reference current (I
ref
) resistor and
the values programmed in shadow registers A and C.
The magnitude of the signal currents for the central
aperturediodesD1 to D4andtheradialdiodes R1 and R2
are programmed separately to sixteen separate current
ranges.
The maximum input currents with an external 30 k
reference current resistor are given in Table 12.
Table 12
Shadow register settings to control diode input current ranges
SHADEN BIT
SHADOW
REGISTER
ADDRESS
DATA
FUNCTION
INITIAL
1
A signal
magnitude
control for
diodes
D1 to D4
1010
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
(0.042).I
ref
= 1.006
μ
A (nominal)
(0.083).I
ref
= 2.013
μ
A (nominal)
(0.125).I
ref
= 3.019
μ
A (nominal)
(0.167).I
ref
= 4.025
μ
A (nominal)
(0.208).I
ref
= 5.031
μ
A (nominal)
(0.25).I
ref
= 6.034
μ
A (nominal)
(0.292).I
ref
= 7.044
μ
A (nominal)
(0.333).I
ref
= 8.05
μ
A (nominal)
(0.375).I
ref
= 9.056
μ
A (nominal)
(0.417).I
ref
= 10.063
μ
A (nominal)
(0.458).I
ref
= 11.069
μ
A (nominal)
(0.5).I
ref
= 12.075
μ
A (nominal)
(0.542).I
ref
= 13.081
μ
A (nominal)
(0.583).I
ref
= 14.088
μ
A (nominal)
(0.625).I
ref
= 15.094
μ
A (nominal)
(0.667).I
ref
= 16.1
μ
A (nominal)
reset
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7327H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder with integrated DAC for video CD CD7 II
SAA7327H/T/M2B,557 功能描述:視頻 IC COMPACT DISC SYSTEMS RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7327HBG 功能描述:視頻 IC COMPACT DISC SYSTEMS RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7335 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DSP for CD and DVD-ROM systems
SAA7335GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DSP for CD and DVD-ROM systems
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