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| 型號(hào)： | SAA7326 |
| 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)： | 30/68頁 |
| 文件大?。?/td> | 284K |
| 代理商： | SAA7326 |
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2000 Jun 26
30
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10 II)
SAA7326
During the actuator jump mode, velocity control with a
PI controller is used for the actuator. The sledge is then
continuouslycontrolledusingthefilteredvalueoftheradial
PID output. All filter parameters (for actuator and sledge)
are user programmable.
In the sledge jump mode maximum power (user
programmable) is applied to the sledge in the correct
direction while the actuator becomes idle (the contents of
the actuator integrator leaks to zero just after the sledge
jump mode is initiated). The actuator can be electronically
damped during sledge jump. The gain of the damping loop
is controlled via the hold_mult parameter.
Fast track jumping circuitry can be enabled/disabled via
the xtra_preset parameter.
7.14.4.5
Radial automatic gain control loop
The loop gain of the radial control loop can be corrected
automatically to eliminate tolerances in the radial loop.
Thisgaincontrolinjectsasignalintotheloopwhichisused
to correct the loop gain. Since this decreases the optimum
performance, the gain control should only be activated for
a short time (for example, when starting a new disc).
This gain control differs from the level initialization. The
level initialization should be performed first.
The disadvantage of using the level initialization without
the gain control is that only tolerances from the front-end
are reduced.
7.14.5
O
FF
-
TRACK COUNTING
The Track Position signal (TPI) is a flag which is used to
indicate whether the radial spot is positioned on the track,
with a margin of
±
1
4
of the track-pitch. In combination with
the Radial Polarity flag (RP) the relative spot position over
the tracks can be determined.
These signals are, however, afflicted with some
uncertainties caused by:
Disc defects such as scratches and fingerprints
The HF information on the disc, which is considered as
noise by the detector signals.
In order to determine the spot position with sufficient
accuracy, extra conditions are necessary to generate a
Track Loss signal (TL) and an off-track counter value.
These extra conditions influence the maximum speed and
this implies that, internally, one of the following three
counting states is selected:
1.
Protectedstate: usedin normal play situations. Agood
protection against false detection caused by disc
defects is important in this state.
2.
Slow counting state: used in low velocity track jump
situations. In this state a fast response is important
rather than the protection against disc defects (if the
phase relationship between TL and RP of
1
2
π
radians
is affected too much, the direction cannot then be
determined accurately).
3.
Fast counting state: used in high velocity track jump
situations. Highest obtainable velocity is the most
important feature in this state.
7.14.6
D
EFECT DETECTION
A defect detection circuit is incorporated into the
SAA7326. If a defect is detected, the radial and focus error
signals may be zeroed, resulting in better playability.
The defect detector can be switched off, applied only to
focus control or applied to both focus and radial controls
under software control (part of foc_parm1).
The defect detector (see Fig.21) has programmable set
points selectable by the parameter defect_parm.
handbook, full pagewidth
DECIMATION
FILTER
FAST
FILTER
DEFECT
GENERATION
PROGRAMMABLE
HOLD-OFF
SLOW
FILTER
defect
output
sat1
sat2
+
MBG421
Fig.21 Block diagram of defect detector.
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| SAA7327H/T/M2B,557 | 功能描述:視頻 IC COMPACT DISC SYSTEMS RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
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