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SAA7824 Datasheet(PDF) 30 Page - NXP Semiconductors |
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SAA7824 Datasheet(HTML) 30 Page - NXP Semiconductors |
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30 / 89 page  2003 Oct 01 30 Philips Semiconductors Product specification CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control SAA7824 01 (bank 1) C signal magnitude control for diodes R1 and R2 (LF only) 1100 0000 20 − 0001 25 − 0010 30 − 0011 40 − 0100 60 − 0101 75 − 0110 100 − 0111 120 − 1000 150 − 1001 200 − 1010 270 − 1011 350 − 1100 450 − 1101 600 − 1110 720 − 1111 960 reset SHADEN BITS SHADOW REGISTER ADDRESS DATA VOLTAGE (mV) INITIAL 7.16.2 SIGNAL CONDITIONING The digital codes retrieved from the ADCs are applied to logic circuitry to obtain the various control signals. The signals from the central aperture diodes are processed to obtain a normalised focus error signal: Where the detector set-up is assumed to be as shown in Fig.21. In the event of single Foucault focusing method, the signal conditioning can be switched under software control such that the signal processing is as follows: The error signal, FEn, is further processed by a Proportional Integral and Differential (PID) filter section. A Focus OK (FOK) flag is generated by the central aperture signal and an adjustable reference level. This signal is used to provide extra protection for the Track-Loss (TL) generation, the focus start-up procedure and the dropout detection. The radial or tracking error signal is generated by the satellite detector signals R1 and R2. The radial error signal can be formulated as follows: REs = (R1 − R2) × re_gain + (R1 + R2) × re_offset. Where the index ‘s’ indicates the automatic scaling operation which is performed on the radial error signal. This scaling is necessary to avoid non-optimum dynamic range usage in the digital representation and reduces the radial bandwidth spread. Furthermore, the radial error signal will be made free from offset during start-up of the disc. The four signals from the central aperture detectors, together with the satellite detector signals generate a Track Position signal (TPI) which can be formulated as follows: TPI = sign [(D1 + D2 + D3 + D4) − (R1 + R2) × sum_gain] Where the weighting factor sum_gain is generated internally by the SAA7824 during initialization. FE n D1 D2 – D1 D2 + ---------------------- D3 D4 – D3 D4 + ---------------------- – = FE n 2 D1 D2 – D1 D2 + ---------------------- × = |
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