ML7345 Family LSIs Hardware Design Manual
3
R11
2. Clock Input
2.1. Crystal Oscillator circuit
Figure 2.1 shows a configuration example of the crystal oscillator circuit.
Capacitors should be connected to XIN (#5) and XOUT (#6) pins to stabilize 24MHz crystal oscillator circuit. To
determine the component values, the oscillator circuit evaluation on your designing board is required, since the
stray capacitor of the board will be influenced.
Amplitude level, oscillation margin, frequency accuracy and oscillator circuit start-up time should be considered
and evaluated.
Figure 2.1 Crystal Oscillator circuit configurations
2.1.1. Circuit component values for crystal oscillator circuit
It is recommended to ask your oscillator manufacturer to evaluate the matching component values on the
assembled board. The following tables show the matching component values with LAPIS Semiconductor RF
board as reference.
Table 2.1.1 Representative matching component values
Manufacturer
Oscillator
Type
Frequency
(MHz)
Equivalent
series resister
Max(Ω)
Load
capacitor
(pF)
Component
Values
Operating Condition
(+/-10ppm)
C4
(pF)
C5
(pF)
R11
(
Ω
)
Power supply
voltage range
VDDIO(V)
Temperature range
(
℃
)
NDK
NX2016SA
(CHP-CZS-6)
24
80
Ω
8pF
1pF
1pF
0Ω
1.8 to 3.6
0
～
+70
℃
EPSON
FA-128
24
80
Ω
8pF
5pF
5pF
100Ω
1.8 to 3.6
-10
～
+70
℃
YOKETAN
S2016A
24
110Ω
6pF
2.7pF
2.7pF
0Ω
1.8 to 3.6
-10
～
+70
℃
[Note] These component values appropriate for use on the LAPIS Semiconductor’s RF board. It is not guaranteed
to obtain same result on your specific board.
X
IN
(#
5
)
C4
X
’tal
X
OU
T(
#
6
)
C5
