关于VC-TCXO压控温补晶振和TCXO温补晶振引脚使用说明如下：

针对VC-TCXO压控温补晶振和TCXO温补晶振，区别主要体现在#1脚：

VC-TCXO压控温补晶振#1脚：Vcont（Voltage Control）电压控制功能

TCXO温补晶振#1脚：GND（Ground）接地

另：

具备Stand-by待机功能的TCXO温补晶振#1脚：ENABLE/DISABLE开/关（Stand-by Function待机功能）

VC-TCXO压控温补晶振和TCXO温补晶振其它引脚说明:

#2脚：GND接地

#3脚：OUTPUT频率信号输出

#4脚：Vcc供电

VC-TCXO压控温补晶振测试电路如下：

TCXO温补晶振测试电路如下：

What is a voltage controlled temperature compensated crystal oscillator?

Temperature Compensated Crystal Oscillators (TCXOs) deliver excellent temperature characteristics combined with low power consumption and fast warmup. Voltage Controlled Temperature Compensated Crystal Oscillators (VC-TCXOs) combine the same excellent temperature characteristics, low power consumption and fast warmup with a voltage control function to allow precise tuning of the output frequency after PCB assembly.

Voltage control can also be used during operational life, to compensate for any effects of aging as well as offering the ability to pull back to nominal frequency where there is a change of circuit conditions. TCXOs and VC-TCXOs are used where the stability of a standard Crystal Clock Oscillator is insufficient.