TPD4E1U06: Several questions of CL

Part Number:TPD4E1U06

Hi all

Would you mind if we ask TPD4E1U06?

<Question1>
There is the description of CL "Condtion f = 1 MHz, VBIAS = 2.5 V, 25°C" on the datasheet P5.
Does VBIAS mean the applied voltage at D1+/- or D2+/-?

<Question2>
And then, the condition of frequency is 1MHz.
If the frequency is 100MHz, does CL increase or decrease?

Kind regards,

Hirotaka Matsumoto