Hi Satoshi,
I'm assuming "DAC sampling frequency" means the input rate, thus the DAC output rate in 1x2 HP mode would be 400 Msps. If so, then yes, you can use 1x2 HP mode to take a 200 Msps input signal, interpolate up to 400 Msps, and output a signal from 125 MHz to 175 MHz. Note that the DAC image will sit at 225 MHz which would need to be filtered out in the final application.
Regards,
Matt Guibord