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All data sheets are subject to change without notice

©2005 Maxwell Technologies

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12-Bit, 41 MSPS A/D Converter

9042

01.07.05 REV 7

Figure 26. Analog Input Offset by +2.4 V Reference

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