saa7825 NXP Semiconductors, saa7825 Datasheet - Page 10

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saa7825

Manufacturer Part Number
saa7825
Description
Cd Audio Decoder, Digital Servo And Filterless Dac With Integrated Pre-amp And Laser Control
Manufacturer
NXP Semiconductors
Datasheet

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Philips Semiconductors
7.2.4
The SAA7825 may be placed in two standby modes,
selected by decoder register B (it should be noted that the
device core is still active):
In the standby modes the various pins will have the
following values:
Table 2 External capacitor selection based upon the crystal type (f
2003 Aug 13
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’.
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.
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
CAPACITANCE (C
CRYSTAL LOAD
S
TANDBY MODES
10 pF
20 pF
30 pF
L
)
CRYSTAL RESISTANCE
MAXIMUM SERIES
<300
<300
<300
(R
S
)
10
Table 1 Playback speeds
7.3
The crystal oscillator is a conventional 2-pin design which
can also operate with a ceramic resonator. The external
components used around the crystal are illustrated in Fig.4
together with component values (C1 and C2) for a given
crystal type; see Table 2. Oscillator frequency to be used
with the SAA7825 is 8.4672 MHz.
handbook, halfpage
REGISTER
0XXX
1XXX
0XXX
B
xtal
Crystal oscillator
= 8.4672 MHz)
27 pF
47 pF
EXTERNAL LOAD CAPACITORS
8 pF
C1
SAA7825
Fig.4 Crystal configuration.
OSCIN
REGISTER
C1
0XXX
0XXX
1XXX
E
OSCILLATOR
XTAL
n = 2; voltage mode only
n = 4; voltage mode only
PLAYBACK SPEED
(f
Objective specification
OSCOUT
xtal
C2
= 8.4672 MHz)
MDB630
27 pF
47 pF
8 pF
SAA7825
C2
n = 1

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