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LMX2571参考设计TIDA-00886中,R15~R20是什么作用?

可否不接?

上方的L1、L2及C8、C9应该是构成了open-drain,开路输出。

如果我使用push-pull,推挽输出,可否只接一个100pF电容到BNC头?

到另一个需求时钟源的器件上,中间只加了一个100pF电容是否可以?

是否需要如R15~R20,接对地电阻?

  • 是的,datasheet中给出了open drain和push pull的两种输出连接方法。 如果是push pull,可直接接100pF到BNC。

    至于R15~R20几个电阻,我请教了下美国的工程师,他是这样回答的:

    Those are used to construct 3dB pi-attenuator. You can omit them if you want to get the max. output power from the device.