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SAA7824 Datasheet(PDF) 27 Page - NXP Semiconductors |
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SAA7824 Datasheet(HTML) 27 Page - NXP Semiconductors |
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27 / 89 page  2003 Oct 01 27 Philips Semiconductors Product specification CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control SAA7824 MGA364 - 2 VSS + M MOTO1 V4 MOTO2 V5 100 nF 10 Ω Fig.19 Motor 4-line PWM mode application diagram. 7.15.1.4 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 × d) Hz], where ‘d’ is the disc speed factor. The PLL frequency signal will be put in pulse-density modulated form (carrier frequency 4.23 × n 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%. In the lock-to-disc (CAV) mode the CDV motor mode is the only mode that can be used to control the motor. 7.15.2 SPINDLE MOTOR OPERATING MODES The operating modes of the motor servo are controlled by decoder register 1; see Table 12. In the SAA7824 decoder there is an anti-windup mode for the motor servo, selected via decoder register 1. When the anti-windup mode is activated the motor servo integrator will hold if the motor output saturates. 7.15.2.1 Motor OV flag The SAA7824 contains a servo loop that is used to regulate the spindle speed. The motor OV flag is provided to indicate when the motor output has overloaded. During a large change in disc speed i.e. by a long jump or x-factor change, the motor OV flag will be asserted due to the full and longer duration required to attain the new desired speed. The OV flag indicates when the internal processes of the modulator have overflowed and not necessarily when the output power has reached 100%. Similarly, the flag does not fall at a specific output power level but at a specific speed error level. The error level at which the flag falls is determined by the selected servo gain, and will be internally equivalent to +3 × gain or −3 × gain. 7.15.2.2 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. |
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Similar Description - SAA7824 |
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