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SAA7824 Datasheet(PDF) 10 Page - NXP Semiconductors |
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SAA7824 Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 89 page  2003 Oct 01 10 Philips Semiconductors Product specification CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control SAA7824 7.2.4 STANDBY MODES The SAA7824 may be placed in two standby modes, selected by decoder register B (it should be noted that the device core is still active): • Standby 1: CD STOP mode; most I/O functions are switched off • Standby 2: CD PAUSE mode; audio output features are switched off, but the motor loop, the motor output and the subcode interfaces remain active; this is also called a ‘Hot Pause’. In the standby modes the various pins will have the following values: • MOTO1 and MOTO2: put in to high-impedance, PWM mode (Standby 1 and RESET: operating in Standby 2); put in high-impedance, PDM mode (Standby 1 and RESET: operating in Standby 2) • Pins SCL and SDA: no interaction; normal operation continues • Pins SCLK, WCLK, DATA, EF and DOBM: 3-state in both standby modes; normal operation continues after reset • Pins OSCIN, OSCOUT, CLK16 and CLK4/12: no interaction; normal operation continues • Pins V1 to V5 and CFLAG: no interaction; normal operation continues. Table 1 Playback speeds 7.3 Crystal oscillator The crystal oscillator is a conventional 2-pin design which can also operate with ceramic resonators. The external components used around the crystal are illustrated in Fig.4 together with component values (C1 and C2) for a given crystal type given in Table 2. Oscillator frequencies that is used with the SAA7824 is 8.4672 MHz. REGISTER B REGISTER E fxtal = 8.4672 MHz 0XXX 0XXX n = 1 1XXX 0XXX n = 2; voltage mode only 0XXX 1XXX n = 4; voltage mode only handbook, halfpage SAA7824 OSCILLATOR XTAL OSCOUT OSCIN C2 C1 MBL439 Fig.4 Crystal configuration. Table 2 External capacitor selection based upon the crystal type CRYSTAL LOAD CAPACITANCE (CL) MAXIMUM SERIES CRYSTAL RESISTANCE (RS) EXTERNAL LOAD CAPACITORS 8 MHz C1 C2 10 pF <300 Ω 8pF 8 pF 20 pF <300 Ω 27 pF 27 pF 30 pF <300 Ω 47 pF 47 pF |
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