MAX9010 Maxim, MAX9010 Datasheet - Page 8

• Manufacturer Part Number: MAX9010
• Description: The MAX9010/MAX9011/MAX9013 single and MAX9012 dual, high-speed comparators operate from a single 4
• Manufacturer: Maxim

tional factor in resolution is the comparator’s stability in
its linear region. Many high-speed comparators are
useless in their linear region because they oscillate.
This makes the differential input voltage region around
zero unusable. Hysteresis helps to cure the problem
but reduces resolution (Figure 2). The devices do not
oscillate in the linear region and require no hysteresis,
which greatly enhances their resolution.
These products operate over a supply voltage range of
4.5V to 5.5V. Bypass V
mount ceramic capacitor. Mount the ceramic capacitor
as close as possible to the supply pin to minimize lead
inductance.
As with all high-speed components, careful attention to
board layout is essential for best performance. Use a
PC board with an unbroken ground plane. Pay close
attention to the bandwidth of bypass components and
place them as close as possible to the device.
SC70, 5ns, Low-Power, Single-Supply,
Precision TTL Comparators
8
Figure 2. Effect of Hysteresis on Input Resolution
Figure 1. Timing Diagram
_______________________________________________________________________________________
Power Supplies, Bypassing, and
Applications Information
* WHEN HYSTERESIS IS ADDED, A COMPARATOR CANNOT RESOLVE ANY INPUT SIGNAL WITHIN THE HYSTERESIS BAND.
(DIFFERENTIAL)
CC
OUT
LATCH
ENABLE (LE)
IN+
IN-
WITH HYSTERESIS
IDEAL (WITHOUT HYSTERESIS)
to GND with a 0.1µF surface-
V
OUT
IN
t
PD+
Board Layout
t
H
HYSTERESIS
t
SU
BAND*
Minimize the trace length and area at the comparator
inputs. If the source impedance is high, take the utmost
care in minimizing its susceptibility to pickup of unwant-
ed signals.
Most high-speed comparators have a minimum input
slew-rate requirement. If the input signal does not
transverse the region of instability within a propagation
delay of the comparator, the output can oscillate. This
makes many high-speed comparators unsuitable for
processing either slow-moving signals or fast-moving
signals with low overdrive. The design of these devices
eliminates the minimum input slew-rate requirement.
They are excellent for circuits from DC up to 200MHz,
even with very low overdrive, where small signals need
to be resolved.
Input Slew Rate