LC78620E Datasheet, PDF (27/34 Pages) Sanyo Semicon Device – Compact Disc Player DSP

LC78620E
The clock that is used as the time base is generated by connecting a
16.9344 or 33.8688 MHz oscillator element between these pins. The
OSC OFF command turns off both the VCO and crystal oscillators.
Double- or quad-speed playback can be specified by microprocessor
command.
• Connect a 16.9344 MHz oscillator element between the X_IN (pin 77) and X_OUT (pin 78) pins for double-speed
systems. The playback speed can be set by the normal-speed playback and double-speed playback commands.
• Connect a 33.8688 MHz oscillator element between the X_IN (pin 77) and X_OUT (pin 78) pins for quad-speed
systems. An XTAL32M command must be issued to intialize such systems. Then the playback speed can be set by
the double-speed playback and quad-speed playback commands.
• Recommended crystal and ceramic oscillator elements
Manufacturer
Citizen Watch Co., Ltd.
(crystal oscillator elements)
TDK, Ltd.
(ceramic oscillator elements)
Product No.
CSA-309 (16.9344 MHz)
CSA-309 (33.8688 MHz)
FCR 16.93M2G (16.93 MHz)
FCR 16.93MCG (16.93 MHz)
Load capacitance
C1/C2 (C1 = C2)
6 pF to 10 pF (±10%)
16 pF (±10%)
15 pF (±10%)
30 pF (Includes built-in capacitors)
Damping resistor
Rd
0Ω
0Ω
100 Ω (±10%)
47 Ω (±10%)
Since the conditions for the load capacitors Cin and Cout used varies with the printed circuit board, this circuit
must be tested on the printed circuit board actually used.
25. 16M and 4.2M Pins; Pin 71: 16M, pin 72: 4.2M
In normal- and double-speed playback modes, the 16M pin buffer outputs the 16.9344 MHz external crystal oscillator
16.9344 MHz signal. In quad-speed mode, it outputs the 33.8688 MHz external crystal oscillator 33.8688 MHz signal.
The 4.2M pin supplies the LA9231M or LA9231M system clock, normally outputting a 4.2336 MHz signal. When the
oscillator is turned off both these pins will be fixed at either high or low.
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