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SAA7824 Datasheet(PDF) 28 Page - NXP Semiconductors |
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SAA7824 Datasheet(HTML) 28 Page - NXP Semiconductors |
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28 / 89 page  2003 Oct 01 28 Philips Semiconductors Product specification CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control SAA7824 7.15.3 LOOP CHARACTERISTICS The gain and crossover frequencies of the motor control loop can be programmed via decoder 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 f4: 0.5 × n Hz, 0.7 × n Hz, 1.4 × n Hz and 2.8 × nHz • Crossover frequency f3: 0.85 × n Hz, 1.71 × n Hz and 3.42 × n Hz. It should be noted that the crossover frequencies f3 and f4 are scaled with the overspeed factor ‘n’ whereas the gains are not. 7.15.4 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 will conceal as much as possible to minimize the effect of data loss. Table 12 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. Start mode 2 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. Jump mode Motor servo enabled but FIFO kept reset at 50%, integrator is held. The audio is muted but it is possible to read the subcode. It should be noted that in the CD-ROM modes the data, on EBU and the I2S-bus, is not muted. Jump mode 1 Similar to jump mode but motor integrator is kept at zero. It is used for long jumps where there is a large change in disc speed. Play mode FIFO released after resetting to 50% and the audio mute is released. Stop mode 1 Disc is braked by applying a negative voltage to the motor; no decisions are involved. Stop mode 2 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. Off mode Motor not steered. MGA362 - 2 G f 4 fBW 3 f Fig.20 Motor servo mode diagram. |
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Similar Description - SAA7824 |
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