AD9901

The AD9901 is a digital phase/frequency discriminator capable of directly comparing phase/frequency inputs up to 200 MHz.Processing in a high speed trench-oxide isolated process, com-
bined with an innovative design, gives the AD9901 a linear detection range, free of indeterminate phase detection zones common to other digital designs.

With a single +5 V supply, the AD9901 can be configured to operate with TTL or CMOS logic levels; it can also operate with ECL inputs when operated with a 5.2 V supply. The open-collector outputs allow the output swing to be matched to post-filtering input requirements. A simple current setting resis- tor controls the output stage current range, permitting a reduc-
tion in power when operated at lower frequencies.

A major feature of the AD9901 is its ability to compare phase/frequency inputs at standard IF frequencies without prescalers. Excessive phase uncertainty which is common with standard PLL configurations is also eliminated. The AD9901 provides the locking speed of traditional phase/frequency dis- criminators, with the phase stability of analog mixers.

The AD9901 is available as a commercial temperature range device, 0 C to +70 C, and as a military temperature device,55 C to +125 C. The commercial versions are packaged in a 14-lead ceramic DIP and a 20-lead PLCC.The AD9901 Phase/Frequency Discriminator is available in versions compliant with MIL-STD-883. Refer to the Analog Devices Military Products Databook or current AD9901/883B data sheet for specifications.