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| 型號： | SAA7325 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Digital servo processor and Compact Disc decoder with integrated DAC (CD10 II)(具有綜合數(shù)模轉換器（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援會（CD10型二）（具有綜合數(shù)模轉換器（DAC）的的數(shù)字伺服處理器和光盤譯碼器） |
| 文件頁數(shù)： | 26/68頁 |
| 文件大?。?/td> | 281K |
| 代理商： | SAA7325 |
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2000 Jun 26
26
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10 II)
SAA7325
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
(forthedecoderfunction)andLFsignal(informationforthe
focus servo loop) before it is supplied to the SAA7325.
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
aperture diodes D1 to D4 and the radial diodes 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 10.
Table 12
Shadow register settings to control diode input current ranges
SHADEN BIT
SHADOW
REGISTER
ADDRESS
DATA
FUNCTION
INITIAL
1
A signal
magnitudecontrol
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)
(0.042).I
ref
= 1.006
μ
A (nominal)
(0.042).I
ref
= 1.006
μ
A (nominal)
(0.042).I
ref
= 1.006
μ
A (nominal)
(0.042).I
ref
= 1.006
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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