參數(shù)資料
型號(hào)： SAA7370A
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： Digital servo processor and Compact Disc decoder CD7
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： 14 X 14 MM, 2.70 MM HEIGHT, PLASTIC, MS-022, SOT-393-1, QFP-64
文件頁(yè)數(shù)： 24/60頁(yè)
文件大?。?/td> 248K
代理商： SAA7370A
1998 Feb 26
24
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder (CD7)
SAA7370A
Fig.18 Motor servo mode diagram.
MGA362 - 2
G
f
4
f
BW
3
f
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 SAA7370A.
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
external resistor connected to pin I
refT
. The maximum
current for the central diodes and satellite diodes is given
in the following formulae;
μ
A
μ
A
The V
RH
voltage is internally generated by control circuitry
which ensures that the V
RH
voltage is adjusted depending
on the spread of internal capacitors, using the reference
I
in max central
)
2.4
10
6
–
×
R
IrefT
=
I
in max satellite
)
1.2
10
6
–
×
R
IrefT
=
current generated by the external resistor on I
refT
. In the
application V
RL
is connected to V
SSA1
. The maximum input
currents for a range of resistors is given Table 10.
Table 10
Maximum current input
This mode of V
RH
automatic adjustment can be selected
by the preset latch command.
Alternatively, the dynamic range of the input currents can
be made dependent on the ADC reference voltages VRL
and VRH. The maximum current for the central diodes and
satellite diodes is given in the following formulae;
R
IrefT
(k
)
DIODE INPUT CURRENT RANGE
D1 to D4 (
μ
A)
10.909
10.000
8.889
8.000
7.273
6.667
6.154
5.581
5.106
4.706
4.286
3.871
R1 and R2 (
μ
A)
5.455
5.000
4.444
4.000
3.636
3.333
3.077
2.791
2.553
2.353
2.143
1.935
220
240
270
300
330
360
390
430
470
510
560
620
相關(guān)PDF資料
PDF描述
SAA7370 Digital servo processor and Compact Disc decoder CD7
SAA7371 Digital servo processor and Compact Disc decoder CD7
SAA7371GP Digital servo processor and Compact Disc decoder CD7
SAA7372 Digital servo processor and Compact Disc decoder CD7
SAA7373 Digital servo processor and Compact Disc decoder CD7
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7371 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
SAA7371GP 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
SAA7372 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
SAA7373 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
SAA7373GP 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
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