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TDA1301T Arkusz danych(PDF) 4 Page - NXP Semiconductors |
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TDA1301T Arkusz danych(HTML) 4 Page - NXP Semiconductors |
4 / 14 page March 1994 5 Philips Semiconductors Product specification Digital servo processor (DSIC2) TDA1301T FUNCTIONAL DESCRIPTION Three spots front-end The photo detector in a two-stage three-spots compact disc system normally contains six discrete elements. Four of these elements (in the event of single Foucault: three elements) carry the central aperture (CA) signal while the other two elements (satellite signals) carry the radial tracking information. Besides the HF signal, which is finally applied to both of the audio channels, the central aperture also contains information for the focus servo loop. To enable the HF signal to be processed, the frequency contents of the central aperture signal must be divided into an HF data part and an LF servo part. The HF signal is processed outside the DSIC2 by the TDA1302 or a discrete amplifier-equalizer. The necessary crossover point, to extract the LF servo part, is compensated for in the amplifier. Diode signal processing The analog signals from the photo detectors are converted into a digital representation using analog-to-digital converters. The ADCs are designed to convert unipolar currents into a digital code. The dynamic range of the input currents is adjustable within a given range and is dependent on the ADC input reference voltages VRL and VRH. The maximum current for the central diodes signals is given in equation (1). (1) The maximum current for the satellite signals is given in equation (2). (2) VRH is generated internally. There are four different levels (1.0, 1.5, 2.0 and 2.5 V) which can be selected under software control. In the application VRL is connected to VSSA. It is also possible to drive VRH with an external voltage source but in this situation the internal voltage source has to be switched off (software controlled). 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 detectors are processed so that the normalized focus error signal (FE) given in equation (3) is realized: (3) Where the detector set-up is assumed to be as illustrated in Fig.3. I i max ( ) f sys V RH V RL – ( ) 1.5 10 6 – × × × = µA [ ] I i max ( ) f sys V RH V RL – ( ) 0.75 10 6 – × × × = µA [ ] FE n D1 D2 – D1 D2 + ---------------------- D3 D4 – D3 D4 + ---------------------- – = Fig.3 Diode configuration. |
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