CX5032GA10000H0QSWZZ KSS [Kyocera Kinseki Corpotation], CX5032GA10000H0QSWZZ Datasheet - Page 20

• Manufacturer Part Number: CX5032GA10000H0QSWZZ
• Description: Crystal Units Surface Mount Type
• Manufacturer: KSS [Kyocera Kinseki Corpotation]

(4) Items calculated by equivalent constants and load capacitance
2. Oscillation circuit and crystal unit
(1) Equivalent circuit of oscillation circuit and oscillation conditions
Crystal unit
The equation
as
The equation
larger as
A simplified equivalent circuit is shown below.

C
f
f
f
R
C
Q : Quality factor
s
p
L
: Series resonance frequency
: Capacitance ratio
: Parallel resonance frequency
L
L
L
: Load resonance frequency
: Load resistance
: Load capacitance
becomes smaller.
C
Handling Notes
L
becomes smaller.
f
R
L
L
shows that
shows the change in impedance with a load capacitance connected. The impedance of crystal unit becomes
Oscillation circuit
– R
C
L
f
L
varies as load capacitance
Crystal unit
R
X
L
L

R
C
Q 
f
f
f
p
s
L
L

L





f
2
2
C
C
2 f
R
s
C
2
1
0
1
1
2 (C
R
1
L1 C1
L
1
1
s
1
(f
1
C
C
L
C
C
L
0
0
0
C
/f
C
1
C
0
L
1
1
C

s
Oscillation circuit
C
)1
1
L
2
1
)
2 f
L
- 53 -
1
connected to the crystal unit changes and that
C
– R
s
C
1
0
L
C
= – X
1
R
C
1
C
– R : Negative resistance
X
– X
R
L
L
L
C
: Load capacitance
: Reactance of crystal unit
: Reactance of oscillation circuit
: Load resonance resistance
f
L
becomes larger