SM8706A Datasheet, PDF (5/8 Pages) Nippon Precision Circuits Inc – Clock Generator for DVD Players

SM8706A
FUNCTIONAL DESCRIPTION
36.8640MHz Master Clock
The SM8706A 36.8640MHz master clock circuit is configured, as shown in Figure 3, with the crystal oscillator
element connected between XTI (pin 7) and XTO (pin 8).
Alternatively, the 36.8640MHz master clock can be supplied from an external master clock input on XTI, as
shown in Figure 4.
If an external input clock on XTI is used, it is recommended that the frequency be 36.8640MHz, with 50%
duty, and 3.3V voltage amplitude level.
Furthermore, when using an external clock input, the input signal voltage should not exceed the absolute max-
imum rating, otherwise damage may occur.
C1
XTI (Pin 7)
Oscillator
C2
XTO (Pin 8)
C1, C2 = 5 to 33pF
Control
Logic
Internal
Circuits
MO1 (Pin 3)
MO2 (Pin 4)
Figure 3. Crystal oscillator connection
External Clock
Open
XTI (Pin 7)
Oscillator
XTO (Pin 8)
Control
Logic
Internal
Circuits
MO1 (Pin 3)
MO2 (Pin 4)
Figure 4. External clock input
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