CX-53G View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

CX-53G

Crystal Units Surface Mount Type

Unspecified 

Handling Notes

RL in the equation of load resonance resistance can be made equal to RS by connecting CL in series, or making it infinite,

which prevents increase in the load resonance resistance.

RL  R1

1

C0

CL

2

Vcc

C5

R2

L1

R1

C2

C6

OUT

R3

C3

L2

C1

Ct

C4

1000P R4

To prevent decrease in the negative resistance, connect the crystal unit to the base of the transistor as in the fundamental

mode crystal oscillation circuit. To use the crystal circuit for both oscillation and multiplication, connect a parallel resonance

circuit having multiplication frequency as resonance frequency to the collector of the transistor.

When selecting circuit constants for zero adjustment range by trimmer capacitor, set the constants to values obtained by

adding approx. 12 to 1510-6 to the room temperature deviation of the crystal unit, centering the value obtained by

measuring the crystal unit with load capacitances in series. (When the room temperature deviation specification of the crystal

unit is 1010-6)

(8) Excitation power of oscillation circuit

Normal operation of crystal units is not assured when excitation power is raised. The allowable excitation power varies

depending on the shape of the crystal unit or the stability of targeted frequency. When highly accurate oscillation is required,

however, it is recommended to use an oscillation circuit with an excitation power of 5 to 50 µW or less. For other cases, refer

to individual relevant crystal units on the pages of the catalog.

(9) Precautions for designing printed circuit board

Be sure to design printed circuit board patterns that connect a crystal unit with other oscillation elements so that the lengths

of such patterns become shortest possible to prevent deterioration of characteristics due to stray capacitances and wiring

inductance. For multi-layer circuit boards, it is important not to wire the ground and other signal patterns right beneath the

oscillation circuit.

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