2.
Connecting a ceramic oscillator
Figure 4-4 shows a typical method of connecting a ceramic oscillator.
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
.
Figure 4-5 Board Design of Oscillator Circuit
OSC
OSC
C
1
C
2
Signal A
Signal B
2
1
To be avoided
1
2
C
1
C
2
OSC
OSC
R
f
R = 1 M
±
20%
f
Ω
Frequency
1.0 MHz
4.0 MHz
Ceramic
oscillator
Murata
Murata
C
1
, C
2
Recommendation
value
150 pF
±
10%
30 pF
±
10%
Products Name
CSB 1000J
CSA 4.00MG
89