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Voltage Controlled Oscillators (VCOs) | MC14046B
概览
MC14046B 相锁定环路包含两个相位比较器、一个电压控制振荡器 (VCO)、源跟随器和齐纳二极管。这些比较器具有两个公共信号输入 PCAin 和 PCBin。输入 PCAin 可直接用于耦合大电压信号，或间接（使用串联电容器）耦合小电压信号。自偏置电路在该放大器的线性区域调节小电压信号。相位比较器 1（专用 OR 门极）提供数字错误信号 PC1out，并在 PCAin 和 PCBin 信号之间保持中间频率 90 相移位（两者均为 50% 占空比）。相位比较器 2（带前缘感应逻辑）提供数字错误信号 PC2out 和 LD，并在 PCAin 和 PCBin 信号之间保持 0 相移位（占空比不重要）。该线性 VCO 会产生输出信号 VCOout，其频率由输入 VCOin 的电压以及与引脚 C1A、C1B、R1 和 R2 联接的电容器和电阻确定。对于需要 VCOin 信号弹无法耐受负载的情况，使用带外部电阻的源跟随器输出 SFout。禁止输入 Inh 处于高电平时将禁用 VCO 和源跟随器，以最大程度降低待机功耗。齐纳二极管可用于进行电源调节。应用包括调频 (FM) 和 FSK 调制和解调、频率合成和相乘、频率识别，音调解码，数据同步和调理，电压-频率转换和电机速度控制。
特性
- Buffered Outputs Compatible with HTL and Low-Power TTL
- Diode Protection on All Inputs
- Supply Voltage Range = 3.0 to 18 V
- Pin-for-Pin Replacement for CD4046B
- Phase Comparator 1 is an Exclusive Or Gate and is Duty Cycle Limited
- Phase Comparator 2 switches on Rising Edges and is not Duty Cycle
- Pb-Free Packages are Available*
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