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Analog-to-digital
Conversion Basics
Figure 30-1
Understanding WORD and BYTE Formats
Before you can understand how the WORD and BYTE downloads work, it is
necessary to understand how Infiniium creates waveform data.
The input channel of every digital sampling oscilloscope contains an
analog-to-digital converter (ADC) as shown in Figure 30-1. The 8-bit ADC in
Infiniium consists of 256 voltage comparators. Each comparator has two inputs.
One input is connected to a reference dc voltage level and the other input is
connected to the channel input. When the voltage of the waveform on the
channel input is greater than the dc level, then the comparator output is a 1
otherwise the output is a 0. Each of the comparators has a different reference
dc voltage. The output of the comparators is converted into an 8-bit integer by
the encoder.
Vref
Channel Input
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-Vref
Block Diagram of an ADC
Waveform Commands
DATA? Example for Digital Channels
Encoder
8 bits
30-37
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