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參數(shù)資料
| 型號(hào)： | 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(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援會(huì)（CD10型二）（具有綜合數(shù)模轉(zhuǎn)換器（DAC）的的數(shù)字伺服處理器和光盤譯碼器） |
| 文件頁數(shù)： | 27/68頁 |
| 文件大?。?/td> | 281K |
| 代理商： | SAA7325 |
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2000 Jun 26
27
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10 II)
SAA7325
1
C signal
magnitudecontrol
for diodes
R1 and R2
1100
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
SHADEN BIT
SHADOW
REGISTER
ADDRESS
DATA
FUNCTION
INITIAL
7.14.2
S
IGNAL CONDITIONING
The digital codes retrieved from the ADCs are applied to
logic circuitry to obtain the various control signals.
The signals from the central aperture diodes are
processed to obtain a normalised focus error signal.
where the detector set-up is assumed to be as shown in
Fig.20.
In the event of single Foucault focusing method, the signal
conditioning can be switched under software control such
that the signal processing is as follows:
D2
–
D1
D2
+
The error signal, FE
n
, is further processed by a
Proportional Integral and Differential (PID) filter section.
A Focus OK (FOK) 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.
FE
n
D1
D2
D2
–
+
D1
D3
D4
D4
–
+
D3
–
=
FE
n
2
D1
×
=
The radial or tracking error signal is generated by the
satellitedetector signals R1 andR2.The radial errorsignal
can be formulated as follows:
RE
s
R1
R2
–
(
)
re_gain
×
=
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 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 SAA7325 during initialization.
R1
R2
+
(
)
re_offset
×
+
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