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TLV9152: TLV9152 slew rate doesn't meet spec?

Part Number: TLV9152

Hi,

I was using TLV9152 for a 1Meg bandwidth current sensing application. Below is the part of circuit I found problematic.

I tested the circuit with a signal generator,inputing 600KHz 270mVpp sine wave, the output is a sawtooth wave, showing a slew rate of 552mV/uS. Which is far below the specified 21V/us. 

The output gets sinasoidal when reducing the input voltage or frequency .

Where may go wrong with this?