CX3225SB20000D0PESZZ 데이터 시트보기 (PDF) - Kyocera Kinseki Corpotation

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CX3225SB20000D0PESZZ

Crystal Units Surface Mount Type

Kyocera Kinseki Corpotation 

Handling Notes

(4) Items calculated by equivalent constants and load capacitance

fs: Series resonance frequency

fp: Parallel resonance frequency

 : Capacitance ratio

fL : Load resonance frequency

RL : Load resistance

CL : Load capacitance

Q : Quality factor

fs  2

1

L1

C1

fp 

2

1

L1

C

C

0

0

C1

C1

  C0

C1

fL  fs

2

C1

(C0 CL)

1

RL  R1

1

C0

CL

2

CL 

C1

2

1

(f L/f s)1

C0

Q  2 fs L1 

1

R1

2 fs C1 R1

The equation fL shows that fL varies as load capacitance CL connected to the crystal unit changes and that fL becomes larger

as CL becomes smaller.

The equation RL shows the change in impedance with a load capacitance connected. The impedance of crystal unit becomes

larger as CL becomes smaller.

2. Oscillation circuit and crystal unit

(1) Equivalent circuit of oscillation circuit and oscillation conditions

A simplified equivalent circuit is shown below.

Crystal unit

Oscillation circuit

Crystal unit

CL

XL

–R

RL

Oscillation circuit

C L = –X C

–R

C L : Load capacitance

–R : Negative resistance

X L : Reactance of crystal unit

–X C : Reactance of oscillation circuit

R L : Load resonance resistance

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