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All data sheets are subject to change without notice

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12-Bit, 41 MSPS A/D Converter

9042

01.07.05 REV 7

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