LMH32401: Rin specification

Part Number: LMH32401
Other Parts Discussed in Thread: TINA-TI,

Concerning input resistance specification for 20k gain

INPUT PERFORMANCE
RIN Input Resistance 270 350 410 Ω.

I want to use the device with a detector that will sink current from the input pin.

The detector has a large capacitance and a large bulk resistance (20pF/300R).

I would like to know exactly what the specification for Rin indicates, because if the input impedance is 350R, bandwidth will be seriously limited.

Measurements on the development board (with 2k connected to the input) indicates a gain of 10 as expected, and the additional 350R does not seem to have an effect.