Datasheet > CXH49SFA08000H0QSWZZ

CXH49SFA08000H0QSWZZ

更新时间： 2024-02-24 02:09:58

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

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CXH49SFA08000H0QSWZZ 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	Reach Compliance Code：	unknown
HTS代码：	8541.60.00.50	风险等级：	5.84
Is Samacsys：	N	晶体/谐振器类型：	PARALLEL - FUNDAMENTAL
驱动电平：	10 µW	频率稳定性：	0.02%
频率容差：	100 ppm	负载电容：	12 pF
安装特点：	THROUGH HOLE MOUNT	标称工作频率：	8 MHz
最高工作温度：	125 °C	最低工作温度：	-40 °C
物理尺寸：	L11.0XB5.0XH3.5 (mm)/L0.433XB0.197XH0.138 (inch)	串联电阻：	90 Ω
表面贴装：	NO	Base Number Matches：	1

CXH49SFA08000H0QSWZZ 数据手册

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Handling Notes

(5) Method of checking oscillation circuit

①Some ICs have a low upper-limit value of usable frequency, so refer to individual IC catalog to make sure that the IC can

oscillate a crystal unit with an adequate negative resistance.

②The following figure shows an example of a CMOS oscillation circuit. Check resistance Rsup is connected in series with

the crystal unit to check the negative resistance. Use 3 to 22pF for C1 and C2, and see the table below for values of check

resistance.

Frequency range

Values of check resistance

3.5 to 4.5MHz

4.6 to 6.0MHz

1.5k

1.0k

800

500

400

sup

6.1 to 10.0MHz

10.1 to 14.0MHz

14.1 to 20.0MHz

③Using a spectrum analyzer or oscilloscope, check that every oscillation is normally activated while turning the power on

and off several times. For oscillation circuits with no power regulator ICs, carefully check changes in the negative

resistance against supply voltage and in frequencies.

④When oscillation is normal, remove the check resistance before using the crystal circuit.

⑤If oscillation is unstable or is not generated, gradually decrease the values of C1 and C2 until normal oscillation is obtained.

⑥If normal oscillation cannot be generated near 10MHz or near 20MHz, replace the IC with a new one suitable for higher

frequencies.

(6) Load capacitance and oscillation frequency of transistor/fundamental crystal oscillation circuit

Viewed from the connection terminals of a crystal unit, the load capacitance C_Lof an oscillation circuit is generally comprised

of C1, C_t, C2, and C3 if stray capacitance of the circuit and the capacitance between base and emitter of the transistor are

ignored. Since trimmer capacitor is adjusted to C_T= MIN. to MAX. for zero adjustment of the oscillation frequency, the value

of C_Lat this time can be obtained from the following equation.

1

^1to C_LMAX.



C_LMIN. 



C1CT

When these calculation results are substituted for the following equation for load resonance frequency, the oscillation

frequency can be obtained.

C₁

f_L f_s

1

2 (C₀C_L)

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