Posted 01 September 2004 - 07:56 AM
Posted 01 September 2004 - 08:08 AM
You also might find you answer by looking at the last 2 items in our basic FAQ which describe the U12s 12-bit resolution and PGA:
Posted 17 July 2014 - 01:19 PM
Hi, I have the same question about U6. Will the Dynamic Range be: DR=20*log(20/(20/2^16))=96.33 dB? This with 16 bit resolution and +-10V range (Gain=1).
Posted 17 July 2014 - 02:44 PM
Looks like you are wanting to express resolution in dB rather than bits, and I would agree that 16-bits corresponds to 20*log(2^16) = 96.3 dB.
That answer makes sense, because 20 dB is a factor of 10, so we could write equivalencies like the following:
10 counts => 1:10 => 20 dB
100 counts => 1:100 => 40 dB
1000 counts => 1:1000 => 60 dB
10000 counts => 1:10000 => 80 dB
100000 counts => 1:100000 => 100 dB
16-bits provides 2^16 or 65536 counts, and that is between 10000 and 100000 so it makes sense that the dB is between 80 and 100.
The U6-Pro (and T7-Pro) has a 16-bit ADC and 24-bit ADC. Expressed in dB that is a 96.3 and 144.5. As we discuss in the following app note, however, the stated resolution of an ADC is not super important:
It is more important to include noise so you have an idea of the resolution you can actually acheive, and we provide this information in Appendix B of the U6 User's Guide:
The downside to increasing ResolutionIndex and Gain is that the time per sample increases, as reflected in Section 3.1:
For example, with ResIndex=1 and Gain=1 (max data rate settings) the noise-free resolution is typically 14.0 bits (84.3 dB) and the effective resolution is typically 16.1 bits (96.9 dB). By the way, these numbers are excellent compared to most other 16-bit ADCs ... better than most if not all.
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