CX5032GA10000H0QSWZZ KSS [Kyocera Kinseki Corpotation], CX5032GA10000H0QSWZZ Datasheet - Page 21

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

The oscillation start-up conditions are described as
and in order to oscillate the crystal unit accurately, it must be designed such that the negative resistance of the oscillation
circuit becomes bigger comparing with the resonance resistance value at the time of loading. This ratio is called oscillation
margin degree M
For oscillation circuit designing conditions, it is recommended that an oscillation circuit be designed using a negative
resistance of a value five to ten times or more larger than RL calculated from the resonance resistance specification value.
The mutual conductance of the oscillation circuit decreases after the oscillation has started to continuously compensate for
the power loss due to the load resonance resistance of the crystal unit, which continues oscillation.
The frequency condition is given as follows:
As shown in the following figure, the reactance of the crystal unit varies to a value matching the load capacitance of the
oscillation circuit C
In a steady oscillation state, the load resonance resistance is given as follows:
R
M
R
X
L
L
L
OSC
  R 
 X
  R 
  R  / R
C
Handling Notes
, X
L
 X
OSC
C
L
L
 0

 X
and it is one of critical factors when designing the oscillation circuit and is described as below.
+ X
– X
5
C
. Thus an oscillation frequency is determined.
f
s
f
L
f
- 54 -
p
–1/

Le

C
L
Frequency
f
f
f
s
L
p
: Series resonance frequency
: Load resonance frequency
: Parallel resonance frequency