9042 Datasheet, PDF (21/26 Pages) Maxwell Technologies – 12-Bit, 41 MSPS A/D Converter

12-Bit, 41 MSPS A/D Converter
Figure 26. Analog Input Offset by +2.4 V Reference
9042
Although the 9042 may be used in many applications, it was specifically designed for communications systems which
must digitize wide signal bandwidths. As such, the analog input was designed to be ac-coupled. Since most communi-
cations products do not down-convert to dc, this should not pose a problem. One example of a typical analog input cir-
cuit is shown below. In this application, the analog input is coupled with a high quality chip capacitor, the value of which
can be chosen to provide a low frequency cutoff that is consistent with the signal being sampled; in most cases, a 0.1
mF chip capacitor will work well.
Figure 27. AC-Coupled Analog Input Signal
01.07.05 REV 7
All data sheets are subject to change without notice 21
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