REV. C

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a

Ultrafast Comparators

AD96685/AD96687

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

AD96685 FUNCTIONAL BLOCK DIAGRAM

AD96687 FUNCTIONAL BLOCK DIAGRAM

FEATURES

Fast: 2.5 ns Propagation Delay

Low Power: 118 mW per Comparator

Packages: DIP, TO-100, SOIC, PLCC

Power Supplies: +5 V, –5.2 V

Logic Compatibility: ECL

MIL-STD-883 Versions Available

50 ps Delay Dispersion

APPLICATIONS

High Speed Triggers

High Speed Line Receivers

Threshold Detectors

Window Comparators

Peak Detectors

GENERAL DESCRIPTION

The AD96685 and AD96687 are ultrafast voltage comparators.

The AD96685 is a single comparator with 2.5 ns propagation

delay; the AD96687 is an equally fast dual comparator. Both

devices feature 50 ps propagation delay dispersion which is a

particularly important characteristic of high speed comparators.

It is a measure of the difference in propagation delay under dif-

fering overdrive conditions.

A fast, high precision differential input stage permits consistent

propagation delay with a wide variety of signals in the common-

mode range from –2.5 V to +5 V. Outputs are complementary

digital signals fully compatible with ECL 10 K and 10 KH logic

families. The outputs provide sufficient drive current to directly

drive transmission lines terminated in 50

Ω to –2 V. A level sen-

sitive latch input is included which permits tracking, track-hold,

or sample-hold modes of operation.

The AD96685 and AD96687 are available in both industrial,

–25

°C to +85°C, and military temperature ranges. Industrial

range devices are available in 16-pin DIP, SOIC, and 20-lead

PLCC; additionally, the AD96685 is available in a 10-pin,

TO-100 metal can.