Can you tell me how long it takes to make Dataready high after finish sampling the data?
I asked another engineer to review my process for calculating this number and found that my approach was "more conservative than necessary." This delay will be closer to 0.5ms.
I hope that helps.
The data ready pulse will appear ~0.7ms after the data sampling is complete. I hope that helps.
Thank you, NevadaMark!
Is this delay independent from filter setting or any other parametere setting of the register?
Also, you mentioned 0.7ms is conservative value, can we assume that it is unlikely that it exceeds 0.7ms?
While this parameter is not tested in production, a review of the design creates the expectation that this will not exceed 0.5ms, plus 3%. I hope that helps!
Thank you. Can we assume that this delay is independent from filter setting or other register parameter setting?
The delay from the sample time to the data-ready is constant, but the decimation rate setting, which is associated with the AVG_CNT setting, combines multiple samples together. Without more information on the application requirement, I would tend to assume that the "mean sample time" would be the appropriate reference point. In this case, see the variable "N," in Table 23 (page 12, ADIS16210 datasheet, rev A) and use the following formula to compute the time between the "mean sample time" and the data ready pulse:
Delay = 0.5ms + (1/512) x (N-1)/2
I hope that helps.
Thank you for the answer.
Is this relation between N and fs (output) same for other iSensor products?
In this case, the output data rate is equal to the internal sample rate, divided by N, which represents the decimation rate. The ADIS1622x, ADIS16334, ADIS1644x and ADIS1648x use similar approaches to output data rate control, while the ADIS1620x, ADIS1636x and ADIS1640x do not. Is that what you meant?
Yes, that was what I wanted to know since I didn't see that the output data rate is affected by N in the case of ADIS1620x.
Yes, you are correct. The ADIS16209 uses an older sample rate control approach.
Best regards, NevadaMark
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