Other Parts Discussed in Thread: DAC8811, DAC8822, DAC8820
Hi, Experts:
May I have a question of the reference multiplying bandwidth for the multiplying DAC DAC7811.
As the digital codes goes smaller, the current going out from Iout1 will be smaller, namely the impedance looking into Iout1 pin will be larger, then the attenuation is larger.
For the opertion amplifier, if the Rgain goes larger, the Noise Gain will be 1 +Rf/Rg which will goes smaller. Hence the BW will come larger when attenuation increases. My understanding looks wrong compared to our plot.
Could you kindly please help me to understand the theroy behind this? Thank you.
Yarn