A-to-D converter does frequency translation
Derek Redmayne
Abstract
An analog-to-digital converter that does frequency translation is described.
Keywords
Analog-to-digital converter
down conversion
LTC1420 ADC
LTC1668 DAC
The need to characterize frequency sources, both in the laboratory and in the field, is increasingly important. The circuit in Figure 341.1 offers some interesting attributes in a compact and relatively inexpensive scheme. It uses an LTC1420 ADC to undersample a higher frequency, driving an LTC1668 DAC, followed by a filter to perform a down conversion. The output of the filter is subsequently resampled to produce a manageable sample rate for a single-chip microcontroller. In addition to characterizing ...
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