9042 Datasheet, PDF (19/26 Pages) Maxwell Technologies – 12-Bit, 41 MSPS A/D Converter

12-Bit, 41 MSPS A/D Converter
9042
If no TTL source is available, a clean sine wave may be substituted. In the case of the sine source, the matching net-
work is shown below. Since the matching transformer specified is a 1:1 impedance ratio, R, the load resistor should be
selected to match the source impedance. The input impedance of the 9042 is negligible in most cases.
Figure 23. Sine Source – Differential Encode
If a low jitter ECL clock is available, another option is to accouple a differential ECL signal to the encode input pins as
shown below. The capacitors shown here should be chip capacitors but do not need to be of the low inductance vari-
ety.
Figure 24. Differential ECL for Encode
01.07.05 REV 7
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