General-Purpose Comparators
ADCMP370/ADCMP371
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
VCC
ADCMP370
IN+
OUT
IN–
04745-001
2.25 V to 5.5 V operating voltage range
Low power consumption (4 µA)
High voltage (22 V) tolerance on inputs
Output stages
ADCMP370: open-drain, high voltage (22 V tolerance)
ADCMP371: push-pull
50 nA input bias current
150 nA input offset current
9 mV input offset voltage
Rail-to-rail, common-mode input range
Specified over –40°C to +85°C temperature range
5-lead SC70 packaging
GND
Figure 1.
APPLICATIONS
Voltage detectors
Battery management systems
Analog-to-digital converters
Low voltage applications
Battery-powered electronics
Portable equipment
VCC
ADCMP371
IN+
OUT
The ADCMP370/ADCMP371 are general-purpose comparators
with input offset voltages of 9 mV (maximum) and low power
consumption, which make them ideal for battery-powered,
portable equipment.
IN–
GND
04745-002
GENERAL DESCRIPTION
Figure 2.
The ADCMP371 has a push-pull output stage, while the
ADCMP370 has an open-drain output. The inputs on both
parts and the output on the ADCMP370 can tolerate voltages
up to 22 V, making them suitable for use as voltage detectors in
portable equipment.
The devices are available in space-efficient, 5-lead SC70
packaging.
Rev. D
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ADCMP370/ADCMP371
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Pin Configuration and Function Descriptions..............................5
Applications ....................................................................................... 1
Typical Performance Characteristics ..............................................6
General Description ......................................................................... 1
Applications........................................................................................9
Functional Block Diagrams ............................................................. 1
Basic Comparator ..........................................................................9
Revision History ............................................................................... 2
Adding Hysteresis..........................................................................9
Specifications..................................................................................... 3
Outline Dimensions ....................................................................... 11
Absolute Maximum Ratings............................................................ 4
Ordering Guide .......................................................................... 11
ESD Caution .................................................................................. 4
REVISION HISTORY
6/14—Rev. C to Rev. D
Change to Adding Hysteresis Section .......................................... 10
8/13—Rev. B to Rev. C
Changes to VIN_HI and VIN_LO Equations ......................................... 9
3/11—Rev. A to Rev. B
Changes to Figure 19 Caption......................................................... 9
Changes to Adding Hysteresis Section .......................................... 9
Added Figure 21 and Figure 22, Renumbered Sequentially ..... 10
Updated Outline Dimensions ....................................................... 11
1/06—Rev. 0 to Rev. A
Changes to Features.......................................................................... 1
Changes to Figure 19 ........................................................................ 9
Changes to Figure 20 Caption....................................................... 10
Updated Outline Dimensions ....................................................... 11
10/04—Revision 0: Initial Version
Rev. D | Page 2 of 12
Data Sheet
ADCMP370/ADCMP371
SPECIFICATIONS
VCC = full operating range, TA = −40°C to +85°C, unless otherwise noted.
Table 1.
Parameter
SUPPLY
VCC Operating Voltage Range
Supply Current
COMMON-MODE INPUT RANGE
INPUT OFFSET VOLTAGE
INPUT OFFSET VOLTAGE AVERAGE DRIFT
INPUT BIAS CURRENT
INPUT OFFSET CURRENT
OUT VOLTAGE LOW
OUT VOLTAGE HIGH (ADCMP371)
OUT LEAKAGE CURRENT (ADCMP370)
Output Rise Time
Output Fall Time
TIMING
Propagation Delay
Min
Typ
Max
Unit
Test Conditions/Comments
5.5
7
VCC
9
V
µA
V
mV
µV/°C
nA
nA
V
VIN = VCC /2
VCM = 0 V
VIN = VCC /2
VIN = VCC /2
IN+ < IN−, ISINK = 1.2 mA
V
IN+ > IN−, ISOURCE = 500 µA
30
45
µA
ns
ns
IN+ > IN−, OUT = 22 V
COUT = 15 pF
COUT = 15 pF
5
2
µs
µs
Input overdrive = 10 mV
Input overdrive = 100 mV
2.25
4
0
5
50
150
0.4
0.8 VCC
1
Rev. D | Page 3 of 12
ADCMP370/ADCMP371
Data Sheet
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 2.
Parameter
VCC
IN+, IN−
OUT (ADCMP370)
OUT (ADCMP371)
Operating Temperature Range
Storage Temperature Range
θJA Thermal Impedance, SC70
Lead Temperature
Soldering (10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
Rating
−0.3 V to +6 V
−0.3 V to +25 V
−0.3 V to +25 V
−0.3 V to VCC + 0.3 V
−40°C to +85°C
−65°C to +150°C
146°C/W
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
300°C
215°C
220°C
Rev. D | Page 4 of 12
Data Sheet
ADCMP370/ADCMP371
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
GND
2
IN–
3
5
VCC
4
OUT
ADCMP370/
ADCMP371
04745-003
IN+
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
1
2
3
4
5
Mnemonic
IN+
GND
IN–
OUT
VCC
Description
Noninverting Input.
Ground.
Inverting Input.
Comparator Output. Open drain for ADCMP370. Push-pull for ADCMP371.
Power Supply.
Rev. D | Page 5 of 12
ADCMP370/ADCMP371
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
30
3.0
25
PROPAGATION DELAY (µs)
2.5
15
10
5
tPHL
2.0
1.5
tPLH
1.0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
–40
04745-006
–5
5.5
CM I/P (V)
Figure 4. Input Offset vs. Common-Mode Input Voltage
125
Figure 7. Propagation Delay vs. Temperature
4.5
4.0
4.0
3.5
tPLH –40°C
3.0
2.5
tPLH +125°C
2.0
tPLH +25°C
1.5
3.0
–40°C
1.5
1.0
0.5
0.5
10
20
30
40
50
60
70
80
90
100 110 120 130
INPUT OVERDRIVE (mV)
+125°C
2.0
1.0
0
+25°C
2.5
0
Figure 5. Propagation Delay vs. Input Overdrive (Low to High)
1
2
3
4
SUPPLY VOLTAGE (V)
5
6
04745-021
SUPPLY CURRENT (µA)
3.5
04745-007
PROPAGATION DELAY (µs)
25
85
TEMPERATURE (°C)
04745-013
0.5
0
6
04745-015
OFFSET (mV)
20
Figure 8. Supply Current vs. Supply Voltage (Output Low)
4.0
6
3.5
SUPPLY CURRENT (µA)
4
tPHL +125°C
3
tPHL +25°C
tPHL –40°C
2
1
0
10
3.0
–40°C
2.5
+125°C
+25°C
2.0
1.5
1.0
0.5
20
30
40
50 60 70 80 90 100 110 120 130
INPUT OVERDRIVE (mV)
0
04745-008
PROPAGATION DELAY (µs)
5
1
2
3
4
SUPPLY VOLTAGE (V)
5
Figure 9. Supply Current vs. Supply Voltage (Output High)
Figure 6. Propagation Delay vs. Input Overdrive (High to Low)
Rev. D | Page 6 of 12
Data Sheet
ADCMP370/ADCMP371
1000
900
800
700
700
VCC = 2.25V
600
I BIAS (nA)
OUTPUT LOW VOLTAGE (mV)
900
500
400
500
300
VCC = 3.3V
VCC = 5.5V
300
VCC = 5V
200
100
0
3
2
1
4
5
SINK CURRENT (mA)
–100
5.1
04745-016
0
5.5
1.20
–1.2
1.15
–1.4
1.10
HYSTERESIS (mV)
–1.6
OFFSET (mV)
5.4
Figure 13. Input Bias Current vs. Input Voltage
–1.0
–1.8
–2.2
5.3
VIN (V)
Figure 10. Output Low Voltage vs. Sink Current
–2.0
5.2
04745-023
100
VCC = 2.25V
VCC = 5V
VCC = 3.3V
–2.4
1.05
1.00
0.95
0.90
–2.6
0.85
125
0.80
2.25
Figure 11. Input Offset vs. Temperature
2.75
3.25
4.25
3.75
VCC (V)
4.75
5.25
5.50
04745-027
85
25
TEMPERATURE (°C)
04745-020
–3.0
–40
150
04745-028
–2.8
Figure 14. Hysteresis vs. Supply Voltage
300
3.0
2.5
200
2.0
HYSTERESIS (mV)
250
150
IOUT = 1mA
100
1.5
1.0
VCC = 5V
50
0
–50
0.5
0
50
TEMPERATURE (°C)
100
150
04745-022
OUTPUT LOW VOLTAGE (mV)
IOUT = 2mA
0
–50
Figure 12. Output Low Voltage vs. Temperature
0
50
TEMPERATURE (°C)
100
Figure 15. Hysteresis vs. Temperature
Rev. D | Page 7 of 12
ADCMP370/ADCMP371
CH1 = (IN–) – IN+
1
CH2 = OUT
CH1 = (IN–) – IN+
CH2 = OUT
2
CH1 10mV/DIV
CH2 2.00V/DIV
TIMEBASE: 3.00µs/DIV
04745-029
2
CH1 100mV/DIV CH2 2.00V/DIV
Figure 16. Propagation Delay Timing 10 mV Overdrive
TIMEBASE: 1.00µs/DIV
Figure 17. Propagation Delay Timing 100 mV Overdrive
Rev. D | Page 8 of 12
04745-030
1
Data Sheet
Data Sheet
ADCMP370/ADCMP371
APPLICATIONS
BASIC COMPARATOR
The upper input threshold level is given by
In its most basic configuration, a comparator can be used to
convert an analog input signal to a digital output signal. The
analog signal on IN+ is compared to the voltage on IN−, and
the voltage at OUT is either high or low, depending on whether
IN+ is at a higher or lower potential than IN−, respectively.
The ADCMP370 and ADCMP371 have different digital output
structures. The ADCMP370 has an open-drain output stage
that requires an external resistor to pull OUT to the logic high
voltage level when the output transistor is switched off. This
voltage level can be as high as 22 V. The same 22 V tolerance
also applies to the inputs of the comparators. The pull-up
resistor should be large enough to avoid excessive power
dissipation but small enough to switch logic levels reasonably
quickly when the comparator output is connected to other
digital circuitry. A suitable value is between 1 kΩ and 10 kΩ.
The ADCMP371 has a push-pull output stage, which has an
internal PMOS pull-up and, therefore, does not require an
external resistor. Faster switching speeds between low and high
rails are possible, but the logic high level is limited to VCC.
VCC
VREF (R1 + R2 )
R2
VIN_HI =
The lower input threshold level is given by
VREF (R1 + R2 ) − VCC R1
R2
VIN_LO =
The hysteresis is the difference between these voltage levels
∆V IN =
VCC R1
R2
In the example in Figure 19, Resistor R1 and Resistor R2 are
chosen to give 1 V hysteresis about the reference of 2.5 V, with
VCC = 5 V.
VCC = 5V
ADM331
ADCMP371
VREF = 2.5V
IN–
OUT
IN+
VIN
R1 = 200kΩ
V+
ADM331
ADCMP370
R2 = 1MΩ
VIN
OUT
VOUT
V+
VIN_LO VIN_HI
= 2V
= 3V
VREF
Figure 19. Noninverting ADCMP371 Comparator Configuration with
Hysteresis
0V
04745-017
t
VIN
VIN
With the inverting configuration, the upper and lower
switching thresholds are
Figure 18. Basic Comparator and Input and Output Signals
V IN_HI =
ADDING HYSTERESIS
To prevent oscillations at the output caused by noise or slowly
moving signals passing the switching threshold, positive feedback
can be used to add hysteresis to the differential input.
For the noninverting configuration, shown in Figure 19, two
resistors are used to create different switching thresholds,
depending on whether the input signal is increasing or
decreasing in magnitude. When the input voltage is increasing,
the threshold is above VREF, and when it is decreasing, the
threshold is below VREF.
Rev. D | Page 9 of 12
VIN_HI =
VCC R2
(R1 || R3) + R2
VCC × R2(R1 + R3 )
(R1 × R3) + (R2 × R1) + (R2 × R3)
V IN_LO =
VIN_LO =
VCC (R2 || R3 )
R1 + (R2 || R3 )
VCC × R2 × R3
(R1 × R3) + (R2 × R1) + (R2 × R3)
04745-018
VOUT
VREF
ADCMP370/ADCMP371
Data Sheet
The hysteresis is the difference between these voltage levels and
is given by
∆VIN =
VCC R1
∆VIN =
R2 + R PULLUP
VCC × R1 × R2
VCC = 5V
(R1 × R3) + (R2 × R1) + (R2 × R3)
VCC = 5V
RLOAD
IN+
VIN
ADCMP371
OUT
IN–
VREF = 2.5V
R1 = 1MΩ
RPULLUP
ADCMP370
R1
IN+
04745-031
OUT
VIN
IN–
R2
RLOAD
Figure 21. Noninverting ADCMP370 Comparator Configuration with
Hysteresis
The inverting ADCMP370 configuration is shown in Figure 22.
The upper and lower switching thresholds are
R3 = 1MΩ
R2 = 1MΩ
VOUT HIGH:
VCC
R1
VCC R2
VIN_HI =
VOUT LOW:
VCC
R3
VIN_HI =
R1
(R1 || (R3 + RPULLUP )) + R2
VCC × R2(R1 + (R3 + RPULLUP ))
(R1 × (R3 + RPULLUP )) + (R2 × R1) + (R2 × (R3 + RPULLUP ))
VIN_LO
VIN_HI
R2
R2
V IN_LO =
R3
VIN_LO =
VOUT
VCC (R2 || (R3 + R PULLUP ))
R1 + (R2 || (R3 + R PULLUP ))
VCC × R2 × (R3 + RPULLUP )
(R1 × (R3 + RPULLUP )) + (R2 × R1) + (R2 × (R3 + RPULLUP ))
assuming RLOAD >> R1, R2, R3, RPULLUP.
VIN
04745-019
VIN_LO VIN_HI
= 1.67V = 3.33V
The hysteresis is the difference between these voltage levels and
is given by
∆VIN =
Figure 20. Inverting ADCMP371 Comparator Configuration with Hysteresis
VCC = 5V
For the ADCMP370 configuration, a pull-up resistor is required
for the open-drain output, which affects the hysteresis calculation. The noninverting ADCMP370 configuration is shown in
Figure 21. The upper switching threshold is
R1
RLOAD
R2
The lower input threshold level is given by
VIN_LO =
OUT
IN–
VIN
VREF (R1+ R2 )
RPULLUP
ADCMP370
IN+
VREF (R1 + R2 + RPULLUP ) − VCC R1
R2 + RPULLUP
R2
R3
04745-032
VIN_HI =
VCC × R1 × R2
(R1 × (R3 + RPULLUP )) + (R2 × R1) + (R2 × (R3 + RPULLUP ))
Figure 22. Inverting ADCMP370 Comparator Configuration with Hysteresis
The hysteresis is the difference between these voltage levels
Rev. D | Page 10 of 12
Data Sheet
ADCMP370/ADCMP371
OUTLINE DIMENSIONS
2.20
2.00
1.80
1.35
1.25
1.15
5
1
4
2
3
2.40
2.10
1.80
0.65 BSC
0.10 MAX
COPLANARITY
0.10
0.40
0.10
1.10
0.80
0.30
0.15
SEATING
PLANE
0.22
0.08
0.46
0.36
0.26
072809-A
1.00
0.90
0.70
COMPLIANT TO JEDEC STANDARDS MO-203-AA
Figure 23. 5-Lead Thin Shrink Small Outline Transistor Package [SC70]
(KS-5)
Dimensions shown in millimeters
ORDERING GUIDE
Model 1
ADCMP370AKS-REEL
ADCMP370AKS-REEL7
ADCMP370AKSZ-REEL
ADCMP370AKSZ-REEL7
Temperature Range
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
Package Description
5-Lead SC70
5-Lead SC70
5-Lead SC70
5-Lead SC70
Package Option
KS-5
KS-5
KS-5
KS-5
Branding
M1F
M1F
M8P
M8P
ADCMP371AKS-REEL
ADCMP371AKS-REEL7
ADCMP371AKSZ-REEL7
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
5-Lead SC70
5-Lead SC70
5-Lead SC70
KS-5
KS-5
KS-5
M1G
M1G
M8W
1
Z = RoHS Compliant Part.
Rev. D | Page 11 of 12
ADCMP370/ADCMP371
Data Sheet
NOTES
©2004–2014 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D04745-0-6/14(D)
Rev. D | Page 12 of 12
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