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How could I choose the closed-loop bandwidth (fBW with the AD2S80A Are there guidelines. Resolution Ratio of Reference Frequency/Bandwidth 10 2.5 : 1 12 4 : 1 14 6 : 1 16 7.5 : 1 Could you please help to give some comments on it? Thanks.
That section is a little confusing I agree. The data sheet states, 5. Closed-Loop Bandwidth Selection (C4, C5, R5) a. Choose the closed-loop bandwidth (fBW) required ensuring that the ratio of reference frequency to bandwidth does not exceed the following guidelines: Resolution Ratio of Reference Frequency/Bandwidth 10 2.5 : 1 12 4 : 1 14 6 : 1 16 7.5 : 1 Typical values may be 100 Hz for a 400 Hz reference frequency and 500 Hz to 1000 Hz for a 5 kHz reference frequency. This would be better interpreted as choose a bandwidth at least the ratios mentioned. For example with 12 bits resolution and a 5 kHz reference frequency the bandwidth should be 1.25kHz maximum but down to 500Hz or a 10:1 ratio should be fine. If the customer continues to have trouble determining the component values I can provide some assistance or I suggest the component selection program. It can be found at http://ez.analog.com/message/41875#41875 if you scroll down through the text.