Datasheet ADCMP341, ADCMP343 (Analog Devices)

Dual 0.275% Comparators and Reference with Programmable Hysteresis Data Sheet ADCMP341/ ADCMP343 FEATURES FUNCTIONAL BLOCK DIAGRAMS 400 mV ± 0.275% threshold VDD User programmable hysteresis via resistor string ADCMP341 Supply range: 1.7 V to 5.5 V VINA Low quiescent current: 6.5 µA typical R1 +INA_U Input range includes ground UX R2 +INA_L OUTA M Low input bias current: ±5 nA maximum R3 Open-drain outputs 400mV Supports wired-AND connections VINB Input polarities: OUTB +INB_U ADCMP341 noninverting UX +INB_L M ADCMP343 inverting Small SOT-23 package
001
APPLICATIONS GND
06500- Figure 1. ADCMP341
Portable applications Li-Ion monitoring VDD Handheld instruments LED/relay driving ADCMP343 VINA Optoisolator driving R1 –INA_U Control systems UX R2 –INA_L OUTA M GENERAL DESCRIPTION R3 400mV
The ADCMP341/ADCMP343 consist of two low power, high
VINB
accuracy comparators with a 400 mV reference in an 8-lead
OUTB
SOT-23 package. Operating within a supply range of 1.7 V to
–INB_U UX
5.5 V, the devices only draw 6.5 µA (typical), making them ideal
–INB_L M
for low voltage system monitoring and portable applications. 002 Hysteresis is determined using three resistors in a string configura-
GND
06500- tion with the upper and lower tap points connected to the Figure 2. ADCMP343 ±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
R1 = 22kΩ R2 = 2.2kΩ
change of state in the comparators output results in one of the
R3 = 6.2kΩ
inputs being switched in to the comparator and the other being switched out. This provides the user with a ful y flexible and
OUTA 1
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.
VIN
The comparator outputs are open-drain with the output stage
2
sinking capability guaranteed greater than 5 mA over temperature. 029 The ADCMP341 has noninverting inputs and the ADCMP343
CH1 2.00V CH2 500mV M100ms
06500- has inverting inputs. The devices are suitable for portable, Figure 3. Hysteresis programmed to 513 mV @ VIN on ADCMP341 commercial, industrial, and automotive applications.
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Document Outline Features Applications General Description Functional Block Diagrams Revision History Specifications Absolute Maximum Ratings Thermal Characteristics ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Application Information Comparators and Internal Reference Power Supply Inputs Outputs Programming Hysteresis Layout Recommendations Outline Dimensions Ordering Guide