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SAA7824 Datasheet(PDF) 9 Page - NXP Semiconductors |
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SAA7824 Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 89 page  2003 Oct 01 9 Philips Semiconductors Product specification CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control SAA7824 7 FUNCTIONAL DESCRIPTION 7.1 Data acquisition and HF data path The SAA7824 removes the need for an external diode signal pre-amplifier. A simplified diagram of the HF data path is illustrated in Fig.3. The high-pass filter, equalizing filter HF gain and adaptive slicer are all register programmable, thus enabling the SAA7824 to be optimized for the intended application. handbook, full pagewidth MBL438 op-amp comp 67.7 MHz THRESHOLD CONTROL sliced data adaptive slicer op-amp op-amp bypass Vana summing amplifier equalising filter high-pass filter Vref d4_hf d1_hf hf_gain 5:0 d2_hf d3_hf Fig.3 Simplified block diagram of the HF data path and adaptive slicer. 7.2 Decoder part 7.2.1 PRINCIPLE OPERATING MODES OF THE DECODER The decoding part supports a full audio specification and can operate at single-speed (n = 1), double-speed (n = 2) and quad-speed (n = 4). The factor ‘n’ is called the overspeed factor. A simplified data flow through the decoder part is illustrated in Fig.7 for the M0 version and Fig.8 for the M1 version. 7.2.2 DECODER SPEED AND CRYSTAL FREQUENCY The SAA7824 is a 1 ×, 2× and 4× (three-speed) decoding device, with an internal Phase-Locked Loop (PLL) clock multiplier. Table 1 gives the playback speeds that are achievable in conjunction with crystal frequency, mechanism, and internal clock settings (selectable via decoder register B). 7.2.3 LOCK-TO-DISC MODE For electronic shock absorption applications, the SAA7824 can be put into lock-to-disc mode. This allows Constant Angular Velocity (CAV) disc playback with varying input data rates from the inside-to-outside of the disc. In the lock-to-disc mode, the FIFO is blocked and the decoder will adjust its output data rate to the disc speed. Hence, the frequency of the I2S-bus (WCLK and SCLK) clocks are dependent on the disc speed. In the lock-to-disc mode there is a limit on the maximum variation in disc speed that the SAA7824 will follow. Disc speeds must always be within 25% to 100% range of their nominal value. The lock-to-disc mode is enabled or disabled by decoder register E. |
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