Question 8.16: On the TLC220x data sheet, the equivalent RMS input noise vo......
On the TLC220x data sheet, the equivalent RMS input noise voltage for frequencies between 0.1 Hz and 1 Hz is 0.5 μV peak-to-peak. Verify this result with the data given in Fig. 8.31.
Step-by-Step
Using the numbers from the previous example, we see, in this 0.9 Hz bandwidth, that the contributions from thermal noise are negligible. The contributions from Flicker noise, using Eq. (8.55), are
V_{n o i s e,R M S}^{2}=\int\limits_{f_{L}}^{f_{H}}\frac{FNN}{f}\cdot d f=F N\!N\cdot\ln \frac{f_{H}}{f_{L}} units of V² (8.55)
V_{i n o i s e,R M S}^{2}=\int\limits_{f_{L}}^{f_{H}}\frac{3.14\times10^{-15}}{f}\cdot d f=3.14\times10^{-15}\cdot\ln\frac{1}{0.1}or
V_{i n o i s e,R M S}=85~n VThe peak-to-peak input-referred noise voltage is roughly six times this or 510 nV (verifying the specification matches the data we get with the plot).
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