87
2. Connecting a ceramic oscillator
Figure 4-4 shows a typical method of connecting a ceramic oscillator.
1
2
C
1
C
2
OSC
OSC
R = 1 M
Ω
±
20%
f
R
f
Oscillation
Recommended value
frequency
Manufacturer
for C
1
and C
2
4.0 MHz
Murata Seisakusho
30 pF
±
10%
Figure 4-4 Typical Connection to Ceramic Oscillator
3. Notes on board design
When generating clock pulses by connecting a crystal or ceramic oscillator, pay careful attention
to the following points.
Avoid running signal lines close to the oscillator circuit, since the oscillator may be adversely
affected by induction currents. (See figure 4-5.)
The board should be designed so that the oscillator and load capacitors are located as close as
possible to pins OSC
1
and OSC
2
.
OSC
OSC
C
1
C
2
Signal A
Signal B
2
1
To be avoided
Figure 4-5 Board Design of Oscillator Circuit
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