（VC-TCXO压控温补晶体振荡器测试电路）
关于KDS VC-TCXO DSA321SDN 50MHZ (1XTV50000MCA)规格说明如下：
1XTV50000MCA 压控温补晶振50MHZ主要规格参数
- Device Name晶振名称：VC-TCXO
- TYPE 晶振型号: DSA321SDN
- NOMINAL FREQUENCY标称频率 : 50.000MHz
- SPEC No. 晶振料号: 1XTV50000MCA
- Supply Voltage输入电压：+3.3V
- Current Consumption功耗：+2.0mA max.
- Frequency Stability温度频差(TA=-40~+85℃ Ref. to frequency (TA=+25℃)：±0.5PPM
- Start Up Time启动时间(@90% of final Vout level)：2.0ms
- Output Wave form输出波型 ：Clipped sine wave (DC-coupled)
- Control Range压控范围（Vcont=+1.5V±1.0V）：±6PPM min.
1XTV50000MCA 压控温补晶振50MHZ电气参数详情如下：
Notes
1. Clipped sine wave (DC-coupled)
2. TA=+25℃
3. Please leave after reflow in 2h or more at room ambient.
4. Positive slope (Frequency becomes high in proportion to frequency control voltage.)
1XTV50000MCA 压控温补晶振50MHZ尺寸及引脚说明：
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.
