ADCMP341_15 Datasheet, PDF (1/12 Pages) Analog Devices – Comparators and Reference with Programmable Hysteresis

Data Sheet
Dual 0.275% Comparators and Reference
with Programmable Hysteresis
ADCMP341/ADCMP343
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
V_DD
VINA
R1 _{+INA_U}
R2 +INA_L
R3
VINB
+INB_U
+INB_L
ADCMP341
OUTA
400mV
OUTB
GND
Figure 1. ADCMP341
VINA
R1 _{–INA_U}
R2 –INA_L
R3
VINB
–INB_U
–INB_L
V_DD
ADCMP343
OUTA
400mV
OUTB
OUTA
1
GND
Figure 2. ADCMP343
R1 = 22kΩ
R2 = 2.2kΩ
R3 = 6.2kΩ
V_IN
2
CH1 2.00V CH2 500mV M100ms
Figure 3. Hysteresis programmed to 513 mV @ VIN on ADCMP341
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] ©2007–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com