ADCMP670_07 AD [Analog Devices], ADCMP670_07 Datasheet - Page 13

• Manufacturer Part Number: ADCMP670_07
• Description: Dual Low Power 1.5% Comparator With 400 mV Reference
• Manufacturer: AD [Analog Devices]

APPLICATION INFORMATION
The ADCMP670 is a dual low power comparator with a
built-in 400 mV reference that operates from 1.7 V to 5.5 V.
The comparator is 1.5% accurate with a built-in hysteresis of
8.9 mV. The outputs are open-drain, capable of sinking 40 mA.
COMPARATORS AND INTERNAL REFERENCE
Each comparator has one input available externally.
Comparator A has a noninverting input and Comparator B has
an inverting input available. The other comparator inputs are
connected internally to the 400 mV reference. The rising input
threshold voltage of the comparators is designed to be equal to
that of the reference.
POWER SUPPLY
The ADCMP670 is designed to operate from 1.7 V to 5.5 V.
A 0.1 μF decoupling capacitor is recommended between V
and GND.
INPUTS
The comparator inputs are limited to the maximum V
range. The voltage on these inputs can be above V
above the maximum allowed V
resistor string to the input, care must be taken when choosing
resistor values. This is due to the fact that the input bias current
will be in parallel with the bottom resistor of the string. This
bottom resistor must therefore be chosen first to control the
error introduced by this bias current.
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voltage. When adding a
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but never
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voltage
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OUTPUTS
The comparator outputs are open-drain and are also limited to
the maximum specified V
voltage. These outputs are capable of sinking up to 40 mA.
Outputs can be tied together to provide a window comparator
with a single output.
ADDING HYSTERESIS
To prevent oscillations at the output caused by noise or
slowly moving signals passing the switching threshold, each
comparator has built-in hysteresis of approximately 8.9 mV.
Positive feedback can be used to increase hysteresis to the
noninverting comparator.
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voltage range, regardless of the V
ADCMP670
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