What are the consequences using 3.3Vdc for AVDD with 2.5Vdc reference? I am using Gain 16 configuration with chopping enabled and filter word set to 5 (960 Hz). Should I expect any performance problems?
The minimum supply for AVDD is 4.75V and 1V for reference voltage to maintain proper operation with the part. Please ensure that AVDD and VREF should be within the specified supply voltage. So you cannot use a 3.3V as AVDD.
Thanks for clarification. The reason I asked this question is availability of the 3.3 V AVDD option on the EVAL-AD7190 board (using jumper J1 in the 1-2 position, see below) . I have tested 5.0 AVDD and 3.3 AVDD options on the EVAL-AD7190 board and do not see any significant difference in terms of noise performance and stability in my application (gain 16, filter 5 = 960 Hz, chopping enabled, Sinc4 filter, 2.5 Vdc reference, bipolar input +/- 60mV).
If 5.0 AVDD is really required I will have to add additional circuitry (DC/DC converter and linear regulator) to my design (currently using power from USB 5.0 Vdc source).
The evaluation board is used for AD7190 and AD7192 part. The AD7192 can operate from 3V to 5.25V. So the option for 3.3V is for AD7192 part.
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