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Appendix B
Digitizer Basics
1µ
= Sample Rate 2 MS/s
= Sample Rate 20 MS/s
Figure B-3. 1 MHz Sine Wave Sample
Vertical Sensitivity
Vertical sensitivity describes the smallest input voltage change the digitizer
can capture. This limitation is because one distinct digital voltage
encompasses a range of analog voltages. Therefore, a minute change in
voltage at the input might not be noticeable at the output of the ADC. This
parameter depends on the input range, gain of the input amplifier, and ADC
resolution; it is specified in volts per LSB. Figure B-4 shows the transfer
function of a 3-bit ADC with a vertical range of 5 V having a vertical
sensitivity of 5/8 V/LSB.
© National Instruments Corporation
B-3
NI 5112 User Manual