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| 型號： | SAA7377 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Digital servo processor and Compact Disc decoder CD7 |
| 中文描述： | 數(shù)字伺服處理器和CD7抗原光盤解碼器 |
| 文件頁數(shù)： | 21/56頁 |
| 文件大?。?/td> | 311K |
| 代理商： | SAA7377 |
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1998 Jul 06
21
Philips Semiconductors
Product specifications
Digital servo processor and Compact Disc
decoder (CD7)
SAA7377
7.12.1.4
CDV/CAV output mode
In the CDV motor mode, the FIFO position will be put in
pulse-width modulated form on the MOTO1 pin (carrier
frequency = 300 Hz). The PLL frequency signal will be put
in pulse-density modulated form (carrier
frequency = 4.23 MHz) on the MOTO2 pin. The integrated
motor servo is disabled in this mode.
The PWM signal on MOTO1 corresponds to a total
memory space of 20 frames, therefore the nominal FIFO
position (half full) will result in a PWM output of 60%.
7.12.2
S
PINDLE MOTOR OPERATING MODES
The operation modes of the motor servo is controlled by
register 1 (see Table 9).
In the SAA7377 decoder there is an anti-wind-up mode for
the motor servo, selected via register 1. When the
anti-wind-up mode is activated the motor servo integrator
will hold if the motor output saturates.
7.12.2.1
Power limit
In start mode 1, start mode 2, stop mode 1 and stop
mode 2, a fixed positive or negative voltage is applied to
the motor.
This voltage can be programmed as a percentage of the
maximum possible voltage, via register 6, to limit current
drain during start and stop. The following power limits are
possible;
100% (no power limit), 75%, 50%, or 37% of maximum.
7.12.3
L
OOP CHARACTERISTICS
The gain and crossover frequencies of the motor control
loop can be programmed via registers 4 and 5.
The following parameter values are possible;
Gains: 3.2, 4.0, 6.4, 8.0, 12.8, 16, 25.6 and 32
Crossover frequency f
4
: 0.5 Hz, 0.7 Hz, 1.4 Hz, 2.8 Hz
Crossover frequency f
3
: 0.85 Hz, 1.71 Hz, 3.42 Hz.
7.12.4
FIFO
OVERFLOW
If FIFO overflow occurs during Play mode (e.g. as a result
of motor rotational shock), the FIFO will be automatically
reset to 50% and the audio interpolator tries to conceal as
much as possible to minimise the effect of data loss.
Table 9
Operating modes
MODE
DESCRIPTION
Start mode 1
The disc is accelerated by applying a positive voltage to the spindle motor. No decisions are
involved and the PLL is reset. No disc speed information is available for the microcontroller.
The disc is accelerated as in start mode 1, however the PLL will monitor the disc speed. When the
disc reaches 75% of its nominal speed, the controller will switch to jump mode. The motor status
signals selectable via register 2 are valid.
Motor servo enabled but FIFO kept reset at 50%, integrator is held. The audio is muted but it is
possible to read the subcode.
Similar to jump mode but motor integrator is kept at zero. Used for long jumps where there is a large
change in disc speed.
FIFO released after resetting to 50%. Audio mute released.
Disc is braked by applying a negative voltage to the motor. No decisions are involved.
The disc is braked as in stop mode 1 but the PLL will monitor the disc speed. As soon as the disc
reaches 12% (or 6%, depending on the programmed brake percentage, via register E) of its
nominal speed, the MOTSTOP status signal will go HIGH and switch the motor servo to Off mode.
Motor not steered.
Start mode 2
Jump mode
Jump mode 1
Play mode
Stop mode 1
Stop mode 2
Off mode
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SAA7377GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7 |
| SAA7377GP/M1,518 | 功能描述:IC DIGITAL PROCESSOR/CD7 64QFP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| SAA7378GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single Chip Digital Servo Processor and Compact Disc Decoder |
| SAA7380 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Error correction and host interface IC for CD-ROM ELM |
| SAA7380GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Error correction and host interface IC for CD-ROM ELM |
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