I'm planning to use AD9837 to generate triangular waveform. AD9837 output voltage is between 0.037V - 0.645V. I need 0 - 5V 250KHz triangular waveform. So, I will design a opamp circuitry (as below) to generate 0-5V triangular waveform. I searched rail-to-rail opamps but I could not find any suitable opamp for this application. Which opamp do you recommend?