參數(shù)資料
型號： SAA7325H
廠商： NXP SEMICONDUCTORS
元件分類： 消費家電
英文描述： Digital servo processor and Compact Disc decoder with integrated DAC CD10
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： PLASTIC, SOT-393-1, QFP-64
文件頁數(shù)： 26/68頁
文件大小： 273K
代理商： SAA7325H
1999 Jun 17
26
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10)
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
(for the decoder function) and LF signal (information for the
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
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 (nom)
(0.083).I
ref
= 2.013
μ
A (nom)
(0.125).I
ref
= 3.019
μ
A (nom)
(0.167).I
ref
= 4.025
μ
A (nom)
(0.208).I
ref
= 5.031
μ
A (nom)
(0.25).I
ref
= 6.034
μ
A (nom)
(0.292).I
ref
= 7.044
μ
A (nom)
(0.333).I
ref
= 8.05
μ
A (nom)
(0.375).I
ref
= 9.056
μ
A (nom)
(0.417).I
ref
= 10.063
μ
A (nom)
(0.458).I
ref
= 11.069
μ
A (nom)
(0.5).I
ref
= 12.075
μ
A (nom)
(0.542).I
ref
= 13.081
μ
A (nom)
(0.583).I
ref
= 14.088
μ
A (nom)
(0.625).I
ref
= 15.094
μ
A (nom)
(0.667).I
ref
= 16.1
μ
A (nom)
reset
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