What is the (noninverting) input impedance of AD8337?

And another question: someone has asked about its dynamic range, and got a detailed answer, but in the end it claimed:

"3. The AD8337 was developed and characterized as a differential-output device."

while it is clearly stated in the datasheet that AD8337 is a single-ended amplifier from both input and output.

Have I overlooked anything?

Thanks in advance,

Michael