The AD9901KP is available in a side brazed DIP package (at least its listed as a current production device). However Digikey for example, only stock the PLCC version. With 10MHz inputs it should resolve a few tens of picosec of phase difference. With a 10 bit ADC the resolution would be about 200ps.
If you need more resolution use a higher resolution ADC. If you need less resolution either use a lower resolution ADC or use prescalers to reduce the AD9901input frequency. To compensate for drift in the AD9901 gain one can 1) Use an ADC with its reference proportional to the AD9901 output stage collector current or 2) Servo the AD9901 output stage collector current to the ADC reference or 3) Measure the AD9901 output stage collector current periodically and use the measurement to correct phase detector output measurements for gain drift. Thus an AD9901 can be used to meet both low end and higher resolution requirements. Biased in ECL mode it has input differential amplifiers suitable for signals down to around a couple of hundred mV pp. Since the AD9901 has a triangular phase detection characteristic a pair of them with one input signal inverted for the the second are required to determine the sign of the phase difference. This is readily accomplished by swapping over the connections to one of the differential input buffers of the second AD9901. Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
