參數(shù)資料
型號(hào)： SAA7325
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(pán)譯碼器)
中文描述： 數(shù)字伺服處理器和光盤(pán)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(pán)譯碼器）
文件頁(yè)數(shù)： 28/68頁(yè)
文件大小： 281K
代理商： SAA7325
2000 Jun 26
28
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10 II)
SAA7325
Fig.20 Detector arrangement.
handbook, full pagewidth
D3
D1
D2
SATELLITE
DIODE R1
SATELLITE
DIODE R2
D1
D3
D2
D4
SATELLITE
DIODE R1
SATELLITE
DIODE R2
D1
D2
D3
D4
SATELLITE
DIODE R1
SATELLITE
DIODE R2
single Foucault
astigmatic focus
double Foucault
MBG422
7.14.3
F
OCUS SERVO SYSTEM
7.14.3.1
Focus start-up
Five initially loaded coefficients influence the start-up
behaviour of the focus controller. The automatically
generated triangle voltage can be influenced by
3 parameters; for height (ramp_height) and DC offset
(ramp_offset) of the triangle and its steepness
(ramp_incr).
For protection against false focus point detections two
parameters are available which are an absolute level on
the CA-signal (CA_start) and a level on the FE
n
signal
(FE_start). When this CA level is reached the FOK signal
becomes true.
If the FOK signal is true and the level on the FE
n
signal is
reached, the focus PID is enabled to switch on when the
next zero crossing is detected in the FE
n
signal.
7.14.3.2
Focus position control loop
The focus control loop contains a digital PID controller
which has 5 parameters which are available to the user.
These coefficients influence the integrating (foc_int),
proportional (foc_lead_length, part of foc_parm3) and
differentiating (foc_pole_lead, part of foc_parm1) action of
the PID and a digital low-pass filter (foc_pole_noise, part
of foc_parm2) following the PID. The fifth coefficient
foc_gain influences the loop gain.
7.14.3.3
Dropout detection
This detector can be influenced by one parameter
(CA_drop). The FOK signal will become false and the
integrator of the PID will hold if the CA signal drops below
this programmable absolute CA level. When the FOK
signal becomes false it is assumed, initially, to be caused
by a black dot.
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