### Q

1) Do you have any additional information of the influence of the temperatureover the "Appertur Uncertainty Jitter)?

2) When you apply an input votage of 3V, what is the "shortest" time needed to

"Track-and-Hold" the input signal?

### A

1) We wouldn't normally characterize aperture uncertainty over temperature butyou can see the effect of it in figure 9 (showing the variation of SINAD and

SNR over temperature). The aperture uncertainty will contribute to the noise.

2) The speed of the analog input stage is characterized by its -3dB bandwidth

of 120MHz. If you have a fast rising signal at the input, then the ADC front

end will behave like an RC single pole low pass filter with cutoff frequency at

120MHz. The time constant is t= 1/2*pi*f = 1.3ns to reach 63% of the final

value. You can calculate the settling time to any given percentage T =

-ln(%/100)*1.3ns

e.g. to 0.1% the settling time is -ln(0.1/100)*1.3ns = 6.9*1.3ns = 9.0ns.