I am trying to build a function generator for sinusoidal waveform with frequencies ranging from 1 Khz to 100 Mhz with amplitude of about 4 Vp-p to 10 Vp-p. I have been looking at AD9951 DDS that takes 400 Mhz clock input and provides a maximum output sinewave of 100 Mhz. The IC is powered by 1.8V and takes 3.3V only for DVDD_I/O (pin 43). The datasheet is not detailed enough to touch upon a few point I need clarification with.
- I am looking at a 3.3V, 400 Mhz oscillator (SG3225VAN 400.000000M-KEGA3). The OSC and complementary_OSC (pins 9 and 8) on AD9951 takes 1.8V, is it safe to use a voltage divider at the output of the 400 Mhz oscillator to bring down peak-to-peak voltage to about 1.8V. So using 220R and 68R brings the voltage down to 0.78Vpeak (0.78 x 2 = 1.56Vp-p). Is this approach correct or is there a better way to do this?
- Since AD9951 powers up at 1.8V, I assume, the DAC (pins 20,21) would also output close to 1.8V?
- As I need about 10Vp-p, how to efficiently amplify the ~1.8V DAC signal to 10Vp-p? I have been looking at RF transformers and dedicated ICs such as Mav-11+ which unfortunately cannot be shipped to Australia. Can I get a recommendation on how I can effectively amplify the sinusoidal signal at high frequency of 100 - 200 Mhz?
Edit The load is going to be simple electrical circuits like opamp analysis, transistor biasing and also providing a signal to biosensors and changed the maximum generated frequency to 100 Mhz.