Datasheet > CXH49SFB04915H0PESZZ

CXH49SFB04915H0PESZZ

更新时间： 2024-02-16 13:52:46

品牌	Logo	应用领域
京瓷/艾维克斯 - KYOCERA AVX		晶体
页数	文件大小	规格书
27页	1671K
描述
Crystal Units Surface Mount Type

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CXH49SFB04915H0PESZZ 技术参数

Handling Notes

Vcc

0.01

OUT

Select each circuit constant so that the adjustment ranges of upper and lower frequencies of this circuit are even on the

basis of the frequency of a single crystal unit measured using a specified load capacity, and that the margin of ±8 to 10 10^-6

of the room temperature deviation of the crystal unit can be reserved.

To prevent the decrease in the negative resistance, always connect the crystal unit to the base of the transistor. For

transistors used for oscillation circuits, hfe and fT are important.

To obtain the large negative resistance with small current consumption, select a transistor for high frequency amplification

with hfe of over 250 and fT of 1GHz or more.

(7) Transistor third overtone oscillation circuit

①The resonance circuit comprised of L2 and C3 is required on the emitter side for preventing fundamental mode crystal

oscillation. Set the resonance frequency to a value higher than the intermediate between fundamental wave frequency and

third overtone frequency.

②Use L1, referred to as an elongation coil, to connect the load capacitance of the oscillation circuit in series. R1 prevents

self-excited oscillation by L1. Since it is difficult in general to design the oscillation circuit having adequate negative

resistance in the overtone oscillation frequency band, there are no other effective means of obtaining adequate oscillation

margin except for preventing the increase of load resonance resistance R_Lof the crystal unit.

- 58 -

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