The HMC960LP4E's input impedance can be set to differential 100 or 400 Ohms. But how about the output impedance? In the data sheet, it states:

- The full scale output changes with load, why the span cut a half when the load is 100 Ohms? Does this imply HMC960 is not low output impedance, but has fixed output impedance?
- The 'Output Voltage Range' means the each single end output voltage range, right?