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PDF ADCMP341 Data sheet ( Hoja de datos )
| Número de pieza | ADCMP341 | |
| Descripción | (ADCMP341 / ADCMP343) Dual Comparators | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Dual Comparators with 400mV Reference
and programmable Hysteresis
Preliminary Technical Data
ADCMP341/ADCMP343
FEATURES
Low Quiescent Current: 6.5µA Typ
Supply Range: 1.7V to 5.5V
400mV Reference ±0.8% Accuracy Over Temperature
Input Range Includes Ground
User programmable Hysteresis via resistor string
Low Input Bias Current: ±10nA Max
Open drain outputs with 40mA Typical Sink Current
Supports Wired-AND Connections
Input Polarities:
ADCMP341 noninverting
ADCMP343 inverting
Small SOT-23 Package
APPLICATIONS
Battery-Powered System Monitoring
Threshold Detectors
Relay Driving
Optoisolator Driving
Handheld Instruments
GENERAL DESCRIPTION
The ADCMP341/ADCMP343 combine two low power, low
voltage comparators with a 400mV reference in the 5-lead
SOT-23 package. Operating within a supply range of 1.7V to
5.5V, the devices only draw 6.5µA typical, making them ideal
for low voltage system monitoring and portable applications.
Hysteresis is determined using three resistors in a string
configuration with the upper and lower tap points connected to
the INA_U and INA_L pins of each comparator respectively.
The state of the comparators output internally selects which pin
is connected to the comparator inputs. So a change of state in
the comparator output will result in one of the inputs being
switched in to the comparator and the other being switched
out. This will provide the user with a fully flexible and simple
method of setting the hysteresis. Although there are two pins
available on each comparator, there is only actually one input
available externally at any one time, the other inputs are
connected internally to the reference.
The comparator outputs are open drain with the output stage
sinking capability guaranteed greater than 5mA over
temperature. The ADCMP341 have noninverting inputs and
the ADCMP343 have inverting inputs. Available in
commercial, industrial and automotive temperature ranges.
Rev. PrD
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
VINA
INA_U
INA_L
VS
ADCMP341
OUTA
VINB
400mV
INB_U
INB_L
OUTB
VINA
INA_U
INA_L
VINB
GND
VS
ADCMP343
OUTA
400mV
INB_U
INB_L
OUTB
GND
Figure 1
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
©2006 Analog Devices, Inc. All rights reserved.
1 page  
Preliminary Technical Data
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADCMP341/ADCMP343
OUTA 1
8 OUTB
+INA_U 2 ADCMP341 7 Vs
+INA_L 3
6 +INB_U
GND 4
5 +INB_L
OUTA 1
8 OUTB
-INA_U 2 ADCMP343 7 Vs
-INA_L 3
6 -INB_U
GND 4
5 -INB_L
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1
OUTA
Open Drain Output for comparator A. Capable of sinking up to 40mA of current.
2
INA_U
Monitors Analog Input Voltage on comparator A. Connect to the upper tap point of the resistor string.
Connected internally to the noninverting input on the ADCMP341 or the inverting pin on the ADCMP343
via mux controlled by output level on comparator A. The other input of comparator A is connected to a
400mV reference.
3
INA_L
Monitors Analog Input Voltage on comparator A. Connect to the lower tap point of the resistor string.
Connected internally to the noninverting input on the ADCMP341 or the inverting pin on the ADCMP343
via mux controlled by output level on comparator A. The other input of comparator A is connected to a
400mV reference.
4 GND Ground
5
INB_L
Monitors Analog Input Voltage on comparator B. Connect to the lower tap point of the resistor string.
Connected internally to the noninverting input on the ADCMP341 or the inverting pin on the ADCMP343
via mux controlled by output level on comparator B. The other input of comparator B is connected to a
400mV reference.
6
INB_U
Monitors Analog Input Voltage on comparator B. Connect to the upper tap point of the resistor string.
Connected internally to the noninverting input on the ADCMP341 or the inverting pin on the ADCMP343
via mux controlled by output level on comparator B. The other input of comparator B is connected to a
400mV reference.
7 Vs
Power Supply. Operates from 1.7V to 5.5V.
8
OUTB
Open Drain Output for comparator B. Capable of sinking up to 40mA of current.
Rev. PrD | Page 5 of 13
5 Page 
Preliminary Technical Data
APPLICATIONS INFORMATION
The ADCMP341/3 is a dual low power comparators with a built
in 400mV reference that operates from 1.7V to 5.5V. The
comparators are approx 0.8% accurate with fully programmable
accurate hysteresis implementing a new technique of a three
resistor string on the input. The outputs are open drain capable
of sinking up to 40mA.
COMPARATORS AND INTERNAL REFERENCE
Each of the comparators has one input available externally, the
other comparator inputs are connected internally to the 400mV
reference. The ADCMP341 has two noninverting comparators
and the ADCMP343 has two inverting comparators.
There are two input pins available to each comparator.
However, these two input pins(INx_U, INx_U) connect to the
same input leg of the comparator via a muxing system. This is
to provide fully programmable rising and falling trip points.
The output of the said comparator determines which pin is
connected to the input of the same comparator. Taking Figure
30. as an example, when OUTA is high INA_U is connected to
the comparator input. When the input voltage drops and passes
below the 400mV reference the output goes low. This in turn
disconnects INA_U from the comparator and connects INA_L.
This leg of the string will be at a lower voltage and thus
instantaneously the effect of hysteresis is applied. Therefore,
using a resistor string on the input as shown in Figure 30., the
voltages for the rising and falling trip points can be
programmed by selecting the appropriate resistors in the string.
PROGRAMMING HYSTERESIS
The resistor values can be calculated as follows. The total
resistance of the string is first determined based on the power
budget available. Using the maximum voltage expected on the
pin and the maximum acceptable current available to flow
through the string1, the total resistance of the string is
calculated as follows:
RTOT
= VINMAX
I MAX
1 Assuming the leakage current into the comparator to be negligible
ADCMP341/ADCMP343
Now calculate the three resistor values as follows:
R1
=
RTOT
× (VFALLING
VFALLING
− 0.4)
R3
=
RTOT × 0.4
VRISING
;
R2 = RTOT − R1 − R3 ;
Where:
R1, R2 and R3 are the three resistors as shown in Figure 30.
RTOT is the sum of R1, R2 and R3.
VFALLING is the desired falling trip voltage and lower of the two.
VRISING is the desired rising trip voltage and higher of the two.
VHYST is therefore = V -VRISING FALLING
VINA
R1
INA_U
R2
INA_L
R3
VCC
ADCMP341
OUTA
400mV
Figure 30.
Rev. PrD | Page 11 of 13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ADCMP341.PDF ] | |
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