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ADCMP341 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADCMP341
Description  Dual 0.275% Comparators and Reference with Programmable Hysteresis
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADCMP341 Datasheet(HTML) 1 Page - Analog Devices

 
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Dual 0.275% Comparators and Reference
with Programmable Hysteresis
ADCMP341/ADCMP343
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
FEATURES
400 mV ± 0.275% threshold
User programmable hysteresis via resistor string
Supply range: 1.7 V to 5.5 V
Low quiescent current: 6.5 μA typical
Input range includes ground
Low input bias current: ±5 nA maximum
Open-drain outputs
Supports wired-AND connections
Input polarities:
ADCMP341 noninverting
ADCMP343 inverting
Small SOT-23 package
APPLICATIONS
Portable applications
Li-Ion monitoring
Handheld instruments
LED/relay driving
Optoisolator driving
Control systems
GENERAL DESCRIPTION
The ADCMP341/ADCMP343 consist of two low power, high
accuracy comparators with a 400 mV reference in an 8-lead
SOT-23 package. Operating within a supply range of 1.7 V to
5.5 V, the devices only draw 6.5 μA (typical), making them ideal
for low voltage system monitoring and portable applications.
Hysteresis is determined using three resistors in a string configura-
tion with the upper and lower tap points connected to the
±INA_U and ±INA_L pins of each comparator, respectively.
The state of the outputs of the comparators selects which pin is
internally connected to the comparators input. Therefore, a
change of state in the comparators output results in one of the
inputs being switched in to the comparator and the other being
switched out. This provides the user with a fully flexible and
accurate method of setting the hysteresis. One input of each
comparator is internally connected to the reference. The other
input is available externally, via an internal mux, through pins
±INA_U or ±INA_L. The state of the output determines which
of these pins is connected at any one time.
The comparator outputs are open-drain with the output stage
sinking capability guaranteed greater than 5 mA over temperature.
The ADCMP341 has noninverting inputs and the ADCMP343
has inverting inputs. The devices are suitable for portable,
commercial, industrial, and automotive applications.
FUNCTIONAL BLOCK DIAGRAMS
+INA_U
+INB_U
OUTA
OUTB
VDD
GND
400mV
ADCMP341
+INA_L
+INB_L
VINB
VINA
R1
R2
R3
Figure 1. ADCMP341
–INA_U
–INB_U
OUTA
OUTB
VDD
GND
400mV
ADCMP343
–INA_L
–INB_L
VINB
VINA
R1
R2
R3
Figure 2. ADCMP343
CH1 2.00V
CH2 500mV
2
1
OUTA
VIN
R1 = 22kΩ
R2 = 2.2kΩ
R3 = 6.2kΩ
M100ms
Figure 3. Hysteresis programmed to 513 mV @ VIN on ADCMP341


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