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AD96687BQ Datenblatt(PDF) 5 Page - Analog Devices

Teilenummer AD96687BQ
Bauteilbeschribung  Ultrafast Comparators
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
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AD96687BQ Datenblatt(HTML) 5 Page - Analog Devices

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AD96685/AD96687
–5–
REV. C
APPLICATIONS INFORMATION
The AD96685/87 comparators are very high speed devices.
Consequently, high speed design techniques must be employed
to achieve the best performance. The most critical aspect of any
AD96685/87 design is the use of a low impedance ground
plane.
Another area of particular importance is power supply
decoupling. Normally, both power supply connections should
be separately decoupled to ground through 0.1
µF ceramic and
0.001
µF mica capacitors. The basic design of comparator cir-
cuits makes the negative supply somewhat more sensitive to
variations. As a result more attention should be placed on insur-
ing a “clean” negative supply.
The LATCH ENABLE input is active LOW (latched). If the
latching function is not used, the LATCH ENABLE input
should be grounded (ground is an ECL logic HIGH). The
LATCH ENABLE
input of the AD96687 should be tied to
–2.0 V or left “floating,” to disable the latching function. An
alternate use of the LATCH ENABLE input is as a hysteresis
control input. By varying the voltage at the LATCH ENABLE
input for the AD96685 and the differential voltage between both
latch inputs for the AD96687, small variations in the hysteresis
can be achieved.
Occasionally, one of the two comparator stages within the
AD96687 will not be used. The inputs of the unused compara-
tor should not be allowed to “float.” The high internal gain may
cause the output to oscillate (possibly affecting the other com-
parator which is being used) unless the output is forced into a
fixed state. This is easily accomplished by insuring that the two
inputs are at least one diode drop apart, while also grounding
the LATCH ENABLE input.
The best performance will be achieved with the use of proper
ECL terminations. The open-emitter outputs of the
AD96685/87 are designed to be terminated through 50
Ω resis-
tors to –2.0 V, or any other equivalent ECL termination. If high
speed ECL signals must be routed more than a few centimeters,
MicroStrip or StripLine techniques may be required to insure
proper transition times and prevent output ringing.
The AD96685/87 have been specifically designed to reduce
propagation delay dispersion over an input overdrive range of
100 mV to 1 V. Propagation delay dispersion is the change in
propagation delay which results from a change in the degree of
overdrive (how far the switching point is exceeded by the input).
The overall result is a higher degree of timing accuracy since the
AD96685/87 is far less sensitive to input variations than most
comparator designs.
Typical Applications
HIGH SPEED SAMPLING CIRCUIT
HIGH SPEED WINDOW COMPARATOR
ORDERING GUIDE
Temperature
Package
Model
Type
Range
Description
Options
AD96685BH
Single
–25
°C to +85°C
10-Pin Can, Industrial
H-10A
AD96685BP
Single
–25
°C to +85°C
20-Pin PLCC, Industrial
P-20A
AD96685BQ
Single
–25
°C to +85°C
16-Pin DIP, Industrial
Q-16
AD96685BR
Single
–25
°C to +85°C
16-Pin SOIC, Industrial
R-16A
AD96685BP-REEL
Single
–25
°C to +85°C
20-Pin PLCC, Industrial
P-20A
AD96685TQ
Single
–55
°C to +125°C
16-Pin DIP, Extended Temperature
Q-16
AD96687BP
Dual
–25
°C to +85°C
20-Pin PLCC, Industrial
P-20A
AD96687BQ
Dual
–25
°C to +85°C
16-Pin DIP, Industrial
Q-16
AD96687BR
Dual
–25
°C to +85°C
16-Pin SOIC, Industrial
R-16A
AD96687BR-REEL
Dual
–25
°C to +85°C
16-Pin SOIC, Industrial
R-16A
AD96687TQ
Dual
–55
°C to +125°C
16-Pin DIP, Extended Temperature
Q-16


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