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(yè)數(shù)： 32/68頁(yè)
文件大?。?/td> 281K
代理商： SAA7325
2000 Jun 26
32
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10 II)
SAA7325
During reset (i.e. RESET pin is held LOW) the RA, FO
and SL pins are high-impedance.
7.14.10 L
ASER INTERFACE
The LDON pin (open-drain output) is used to switch the
laser off and on. When the laser is on, the output is
high-impedance. The action of the LDON pin is controlled
by the xtra_preset parameter; the pin is automatically
driven if the focus control loop is active.
7.14.11 R
ADIAL SHOCK DETECTOR
Theshockdetector (seeFig.22) canbeswitched onduring
normal track following, and detects within an adjustable
frequency whether disturbances in the radial spot position
relative to the track exceed an adjustable level (controlled
by shock_level).
Every time the radial tracking error (RE) exceeds this level
the radial control bandwidth is switched to twice its original
bandwidth and the loop gain is increased by a factor of 4.
The shock detection level is adjustable in 16 steps from
0% to 100% of the traverse radial amplitude which is sent
to an amplitude detection unit via an adjustable band-pass
filter(controlledbysledge_parm1);lowercornerfrequency
can be set at either 0 or 20 Hz, and upper corner
frequency at 750 or 1850 Hz. The shock detector is
switched off automatically during jump mode.
7.15
Microcontroller interface
Communication on the microcontroller interface can be
set-up in two different modes:
4-wire bus mode: protocol compatible with SAA7345
(CD6) and TDA1301 (DSIC2) where:
– SCL = serial clock
– SDA = serial data
– RAB = R/W control and data strobe (active HIGH) for
writing to decoder registers 0 to F, reading status bit
selected via decoder register 2 and reading
Q-channel subcode
– SILD = R/W control and data strobe (active LOW) for
servo commands.
I
2
C-bus mode: I
2
C-bus protocol where SAA7325
behaves as slave device, activated by setting
RAB = HIGH and SILD = LOW where:
– I
2
C-bus slave address (write mode) = 30H
– I
2
C-bus slave address (read mode) = 31H
– Maximum data transfer rate = 400 kbits/s.
It should be noted that only servo commands can be used
therefore, writing to decoder registers 0 to F, reading
decoder status and reading Q-channel subcode data must
be performed by servo commands.
Fig.22 Block diagram of radial shock detector.
handbook, full pagewidth
RE
MGC914
SHOCK
OUTPUT
HIGH-PASS FILTER
(0 or 20 Hz)
LOW-PASS FILTER
(750 or 1850 Hz)
AMPLITUDE
DETECTION
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