I want to build a precision arbitrary waveform generator using AD9744 and AD5683R, where AD5683R is used to adjust the reference voltage of AD9744.
1. I found that AD5683R is buffered DAC with internal precision 2.5V Vref, can the output of AD5683R connect to the VREF port of AD9744 directly without any opamp?
2. And is there any reference schematic for using AD5683R together with High speed DACs ?
PS, VOUT is connect to the Vref port of AD9744 directly.
The AD9744 Reference input can be driven from and external voltage source. The input resistance of the AD9744 reference input is 7k ohms. The voltage range is 0.1V to 1.25V. The bandwidth is 500khz. At 1.25V the AD5683 would be driving 148 microamps. It can drive 20ma. I see no problem with using the AD5683 as a reference source for the AD9744.