參數(shù)資料
型號(hào)： SAA7348GP
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： All Compact Disc Engine ACE
中文描述： 8-BIT, MROM, 35 MHz, MICROCONTROLLER, PQFP100
文件頁(yè)數(shù)： 15/60頁(yè)
文件大?。?/td> 205K
代理商： SAA7348GP
1997 Jul 11
15
Philips Semiconductors
Preliminary specification
All Compact Disc Engine (ACE)
SAA7348GP
7.3.2
Focus control
The SAA7348 performs the following focus servo function:
Focus start-up
Focus position control loop
Drop-out detection
Focus loss detection and fast restart
Focus loop gain switching
Focus automatic gain control loop.
7.3.3
R
ADIAL CONTROL
The SAA7348 performs the following radial servo
functions:
Level initialization
Radial position control loop
Sledge control
Tracking control
Access with or without track loss information
Radial automatic gain control loop.
7.3.4
O
FF
-
TRACK COUNTING
The track position signal (TPI) is a flag used to indicate
whether the radial spot is positioned on the track with a
margin of
±
0.25 of the track pitch. One of the following
three counting states is selected:
Protected state
Slow counting state
Fast counting state.
7.3.5
O
FF
-
TRACK DETECTION
The Off-Track Detection (OTD) signal flags off-track
conditions; the polarity of this signal is programmable.
7.3.6
S
HOCK DETECTION
A shock detector can be switched on during normal track
following. Within an adjustable frequency range, it detects
whether disturbances in the radial spot relative to the track
exceed a programmable 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.
7.3.7
D
EFECT DETECTION
A defect detection circuit is incorporated into the
SAA7348. If a defect is detected, the circuit can hold all
radial and focus controls. The defect detector can be
switched off, applied only to focus control, or applied to
both focus and radial controls under software control.
The actions of the circuit can be monitored on the DEFO
pin (active HIGH).
An external defect detector can be added by removing the
connection between DEFO and DEFI (normal operation)
and inserting the necessary circuitry.
7.3.8
D
RIVER INTERFACE
The control signals (pins RA, FO and SL) for the
mechanism actuators are pulse density modulated.
The modulating frequency can be set to either
or
MHz. An analog representation
of the output signals can be generated by connecting a first
order low-pass filter to the outputs.
During reset (i.e. RST pin held HIGH) the RA, FO and SL
pins are high impedance.
7.3.9
L
ASER INTERFACE
The LDON pin (open-drain output) is used to turn the laser
on and off. 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.
7.4
Subcode interface
There are two subcode interfaces:
One which conforms to “EIAJ CP-2401”(using SBSY,
SFSY, RCK and SUB) and can be configured as either
a 3- or 4-wire interface. The interface formats are
illustrated in Fig.6.
An RS232 like format on SUBQW as illustrated in Fig.7.
The subcode sync word is formed by a pause of
μ
s
minimum. Each subcode byte starts with a 1 followed by
7 bits (Q to W). The gap between bytes can vary
n
n
between
and
μ
s. Note that SUBQW is not
valid in lock-to-disc mode (includes QLLV).
The subcode data is also available at the EBU output
(DOBM).
serv8
servo clock
n
200
11.3
90
------
相關(guān)PDF資料
PDF描述
SAA7350 20-BIT INPUT BITSTREAM CONVERSION DAC FOR DIGITAL AUDIO SYSTEMS
SAA7356HL 1394 SBP-2 link layer controller
SAA7360GPB Analog-to-Digital Converter， 18-Bit
SAA7366TD-T Analog-to-Digital Converter， 18-Bit
SAA7360 Bitstream conversion ADC for digital audio systems
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7350 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:20-BIT INPUT BITSTREAM CONVERSION DAC FOR DIGITAL AUDIO SYSTEMS
SAA7356HL 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:1394 SBP-2 link layer controller
SAA7360 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Bitstream conversion ADC for digital audio systems
SAA7360GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Bitstream conversion ADC for digital audio systems
SAA7360GPB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 18-Bit
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*