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參數(shù)資料
| 型號： | SAA7326H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | CABLE ASSEMBLY; TNC MALE TO TNC MALE; 75 OHM, RG59B/U COAX; 12" CABLE LENGTH; *USES STANDARD 50 OHM INTERFACE CONNECTORS* |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | PLASTIC, SOT-393-1, QFP-64 |
| 文件頁數(shù)： | 30/68頁 |
| 文件大?。?/td> | 391K |
| 代理商： | SAA7326H |
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1999 Jun 17
30
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10)
SAA7326
During the actuator jump mode, velocity control with a
PI controller is used for the actuator. The sledge is then
continuously controlled using the filtered value of the radial
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.
This gain control injects a signal into the loop which is used
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.
Protected state: used in normal play situations. A good
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.
Fig.21 Block diagram of defect detector.
handbook, full pagewidth
DECIMATION
FILTER
FAST
FILTER
DEFECT
GENERATION
PROGRAMMABLE
HOLD-OFF
SLOW
FILTER
defect
output
sat1
sat2
+
MBG421
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|---|---|
| SAA7327 | Digital servo processor and Compact Disc decoder with integrated DAC for video CD (CD7 II)(應用于視頻CD的帶綜合數(shù)模轉換器（DAC）的數(shù)字伺服處理器和光盤譯碼器) |
| SAA7335GP | DSP for CD and DVD-ROM systems |
| SAA7335 | DSP for CD and DVD-ROM systems(在CD和DVD-ROM應用中的DSP) |
| SAA7341 | COMS Digital decoding IC for Compact Disc |
| SAA7341GP | COMS Digital decoding IC for Compact Disc |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7327 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder with integrated DAC for video CD CD7 II |
| SAA7327H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder with integrated DAC for video CD CD7 II |
| 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 |
| SAA7327HBG | 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 |
| SAA7335 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DSP for CD and DVD-ROM systems |
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