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參數(shù)資料
| 型號： | SAA7373GP |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Digital servo processor and Compact Disc decoder CD7 |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 文件頁數(shù)： | 24/60頁 |
| 文件大?。?/td> | 323K |
| 代理商： | SAA7373GP |
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1998 Jul 06
24
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder (CD7)
SAA7373
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 SAA7373.
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 V
RL
and V
RH
. 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 |
|---|---|
| SAA7374 | Low voltage digital servo processor and Compact Disc decoder CD7LV |
| SAA7374GP | Low voltage digital servo processor and Compact Disc decoder CD7LV |
| SAA7376 | Digital servo processor and Compact Disc decoder CD7 |
| SAA7377GP | Force/Pressure transducer; Compensated; Pressure Range: 0 to 25 psi |
| SAA7377 | 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 |
|---|---|
| SAA7374 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low voltage digital servo processor and Compact Disc decoder CD7LV |
| SAA7374GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low voltage digital servo processor and Compact Disc decoder CD7LV |
| SAA7376 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7 |
| SAA7377 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7 |
| SAA7377GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7 |
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