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What is the purpose of RFinB in ADF4153A PLL ?

Hello, I would like to know the differences between RFinA and RFinB input in the ADF4153A PLL.

I've read that RFinB must be grounded (via a bypass capacitor) when using single-ended applicaiton but I don't understand what it means.

Is it possible to use RFinB instead of RFinA (and put RFinA to ground) ?

I am trying to debug a device where the VCO output is connected to RFinB instead of RFinA and I am wondering if this is the reason it doesn't work.

Thanks in advance.

Cordially,

Matthieu Maures.

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  • RFinA and RFinB form a differential pair of inputs. So, if you have a VCO with a differential output (or a balun) that can be applied to the A & B inputs.

    Normally you only need to use one input. You can use RFinA or RFinB. The one that you don't use should be connected to ground through a 10pF-100pF capacitor.

    So, it's probably not the reason why it doesn't work.

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  • RFinA and RFinB form a differential pair of inputs. So, if you have a VCO with a differential output (or a balun) that can be applied to the A & B inputs.

    Normally you only need to use one input. You can use RFinA or RFinB. The one that you don't use should be connected to ground through a 10pF-100pF capacitor.

    So, it's probably not the reason why it doesn't work.

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