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TRF1108-DAC39RFEVM: DDS mode and output signal amplitude issue

user5883945
Expert 2416 points

Part Number: TRF1108-DAC39RFEVM
Other Parts Discussed in Thread: TRF1108, THS3491

Dears,

  1. Can any waveform be output in DDS mode? The customer currently only uses EVM board to output square waves.
  2. The customer measured the output sine wave at the TRF1108 output terminal, and its amplitude can only reach up to 1.6V when it is within 300Mhz, and it can only reach 1.2V when the frequency reaches 1G.
    The customer needs to be able to reach 5.5V within 600MHz, and 3.5V between 600MHz and 1.1GHz. May I ask which operational amplifier is suitable for the later stage? Do you have any recommended models. I have previously recommended THS3491, but customer concerned that the slew rate may be too low.