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PGA855: 差分输入

Part Number:PGA855Other Parts Discussed in Thread: TINA-TI

PGA855需要差分输入,输入电压我是用VIN和GND做差分,在PCB走线的时候也要走差分线吗?可不可以直连VIN,gnd和对应的输出端呢

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此外我通过TINA-TI仿真,发现跟手册中的带宽不太一样,我用±5v供电,截止频率只有1M

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您好,

建议使用差分,为了充分利用 PGA855 的性能,即使输入信号是单端的,也应通过适当的电路转换为差分信号,并在 PCB 上使用差分对走线。这样可以确保信号的完整性和系统的整体性能。

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有测试的带宽的数据吗,±5v下的

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目前仅有规格书的数据

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? ??:

在给出的TINA_TI参考设计中,进行交流频响,可以发现1MHz时就会衰减3dB,这与手册中的10dB有出入,这是什么情况呢?

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模型通常会简化某些复杂性,如寄生效应、非线性行为等,这些在高频下可能变得显著,导致仿真结果与实际性能有差异。

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