I am using the ADR366B voltage reference to supply an ADC (AD7476, unique pin for VDD and VRef).
I have two questions:1. What is the high frequency behavior of the ADR366B voltage reference? Do you have an idea of its output impedance and load regulation in the range [100 kHz;100 MHz]?Indeed, I have noticed during testing that ADC conversion fail under 2.2 µF of decoupling capacitance on the ADR366B's output.I understand the ADC draws high frequency current, and I fear the ADR366B voltage reference offers poor regulation in this frequency range.2. According to the datasheet, the TRIM pin is to be left floating if unsed.=> as my environement is pretty noisy, would it not be a good practice to add a decoupling capacitor (as this input leads directly to the bandgap transistors pair)?if yes, I assume this capacitor would be in the 10 nF range and best placed between the TRIM and OUT pins?
Thank you very much for the feedback.
Best regards,Gauthier Lemey
We don't have data for the output Impedance and load regulation for frequency above 100kHz.
In regards for the "Floating" trim pin, the trim pin as I think you might have notice is not really a floating point in the circuit as shown in the simplified schematic (Figure 36.)