AD ADCMP371AKS-RL General purpose comparator Datasheet

Preliminary Technical Data
FEATURES
2.25V to 5.5V Operating Voltage Range
Low Power Consumption (2µA)
Output Stages
ADCMP370: Open-Drain with High Voltage (22V)
Tolerance
ADCMP371: Push-Pull
10nA Input Bias Current
5nA Input Offset Current
6mV Input Offset Voltage
0V to VCC Common Mode Input Range
Specified Over -40°C to +125°C Temperature Range
5-Lead SC70 Package
General Purpose Comparators
ADCMP370/ADCMP371
FUNCTIONAL BLOCK DIAGRAMS
VCC
ADCMP370
ADM331
OUT
IN+
IN-
GND
VCC
APPLICATIONS
Voltage Detectors
Battery Management Systems
A/D Converters
Low Voltage Applications
Battery Powered Electronics
Portable Equipment
GENERAL DESCRIPTION
ADM332
ADCMP371
VCC
IN+
OUT
IN-
GND
The ADCMP370/ADCMP371 are general purpose comparators
with input offset voltages of 6mV (max). High performance
over the -40°C to +125°C temperature range make them
suitable for use in automotive and other thermally harsh
applications, while low power consumption and space efficient
SC70 packaging make them ideal for battery powered portable
equipment.
The ADCMP371 has a push-pull output stage, while the
ADCMP370 has an open-drain output, which can be pulled as
high as 22V through an external resistor.
Rev.PrB
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Specifications subject to change without notice. No license is granted by implication
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© 2004 Analog Devices, Inc. All rights reserved.
ADCMP370/ADCMP371
Preliminary Technical Data
SPECIFICATIONS
(VCC=Full Operating Range, TA=-40°C to +125°C, unless otherwise noted.)
Parameter
SUPPLY
VCC Operating Voltage Range
Supply Current
COMMON MODE INPUT RANGE
INPUT OFFSET VOLTAGE
INPUT BIAS CURRENT
INPUT OFFSET CURRENT
OUT VOLTAGE LOW
OUT VOLTAGE HIGH (ADCMP371)
OUT LEAKAGE CURRENT (ADCMP370)
TIMING
Propagation Delay
Min
Typ
2.25
2
0
10
5
Max
Units
5.5
5
VCC
6
1
V
µA
V
mV
nA
nA
V
V
µA
IN+ < IN-, ISINK=1.2mA
IN+ > IN-, ISOURCE=500µA
IN+ > IN-, OUT=22V
10
2
µs
µs
Input Overdrive=10mV
Input Overdrive=100mV
150
0.3
0.8VCC
5
1
Test Conditions/Comments
VCC = 3.3V
ABSOLUTE MAXIMUM RATINGS
Table 3. TA = 25°C unless otherwise noted.
Parameter
VCC
IN+, INOUT (ADCMP370)
OUT (ADCMP371)
Operating Temperature Range
Storage Temperature Range
θJA Thermal Impedance, SC70
Lead Temperature
Soldering (10 sec)
Vapour Phase (60 sec)
Infrared (15 sec)
Rating
-0.3V to +6V
-0.3V to +6V
-0.3V to +25V
-0.3V to +VCC+0.3V
-40°C to +125°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 and 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.
300°C
215°C
220°C
Rev. PrB | Page 2 of 8
Preliminary Technical Data
ADCMP370/ADCMP371
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
IN+
1
GND
2
IN-
3
5
VCC
4
OUT
ADCMP370/
ADM331/
ADM332
ADCMP371
Table 4. Pin Functional Descriptions
Pin No.
1
2
3
4
5
Name
IN+
GND
INOUT
VCC
Description
Non-Inverting Input
Ground
Inverting Input
Comparator Output. Open-Drain for ADCMP370. Push-Pull for ADCMP371.
Power Supply
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
`
Rev. PrB | Page 3 of 8
ADCMP370/ADCMP371
Preliminary Technical Data
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 1. Supply Current vs. Supply Voltage Output High
Figure 4. Output Voltage vs. Output Current at 2.7V Supply
Figure 2. Supply Current vs. Supply Voltage Output Low
Figure 5. Input Bias Current vs. Supply Voltage
Figure 3. Output Voltage vs. Output Current at 5V Supply
Figure 6. Response Time vs. Input Overdrives Negative Transition (5V)
Rev. PrB | Page 4 of 8
Preliminary Technical Data
ADCMP370/ADCMP371
Figure 7. Response Time vs. Input Overdrives Positive Transition (5V)
Figure 10. Output Saturation Voltage vs. Output Sink Current
Figure 8. Response Time vs. Input Overdrives Negative Transition(2.7V)
Figure 11. 10kHz Response
Figure 9. Response Time vs. Input Overdrives Positive Transition(2.7V)
Rev. PrB | Page 5 of 8
ADCMP370/ADCMP371
Preliminary Technical Data
APPLICATIONS INFORMATION
BASIC COMPARATOR
In it’s 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
which 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 22V. 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 would be between 1kΩ and 10kΩ. The
ADCMP371 has a push-pull output stage which has an internal
PMOS pull-up and therefore doesn’t require an external resistor.
Faster switching speeds between low and high rails are possible,
but the logic high level is limited to VCC.
VCC
the threshold is above VREF and when it’s decreasing, the
threshold is below VREF.
The upper input threshold level is given by:
VIN_HI =
VREF (R1 + R 2) − VCC R1
R2
The lower input threshold level is given by:
VIN_LO =
VREF (R1 + R 2)
R2
The hysteresis is the difference between these voltage levels:
∆VIN =
VCC R1
R2
In the example in figure 13, resistors R1 and R2 are chosen to
give 1V hysteresis about the reference of 2.5V, with VCC=5V. It’s
important that RPULL-UP<<RLOAD so that the output high voltage
isn’t pulled below VCC.
V+
ADM331
ADCMP370
VCC=5V
OUT
VIN
RPULL-UP=5k⍀
ADM331
ADCMP370
VREF
VREF=2.5V
VIN
OUT
ININ+
RLOAD
R1=200k⍀
V+
VOUT
R2=1M⍀
VREF
VOUT
0V
t
VIN
Figure 12. Basic Comparator and Input and Output Signals
ADDING HYSTERESIS
VIN_LO
VIN_HI
=2V
=3V
VIN
Figure 13. Non-Inverting Comparator Configuration with 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 non-inverting configuration, shown in figure 13, 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,
Rev. PrB | Page 6 of 8
Preliminary Technical Data
ADCMP370/ADCMP371
With the inverting configuration, the upper and lower switching
thresholds are as follows:
VIN_HI =
VCC R 2
(R1 || R3) + R 2
VIN_LO =
VCC (R 2 || R3)
R1 + (R 2 || R3)
VCC=5V
ADM332
ADCMP371
R1=1M⍀
VCC
IN+
VIN
OUT
IN-
RLOAD
R3=1M⍀
R2=1M⍀
VOUT High:
VOUT Low:
VCC
R1
VCC
R3
VIN_HI
R1
VIN_LO
R2
R2
R3
VOUT
VIN_LO
VIN_HI
=1.67V
=3.33V
VIN
Figure 14. Non-Inverting Comparator Configuration with Hysteresis
Rev. PrB | Page 7 of 8
ADCMP370/ADCMP371
Preliminary Technical Data
OUTLINE DIMENSIONS
0.087 (2.20)
0.071 (1.80)
0.053 (1.35)
0.045 (1.15)
5
4
0.094 (2.40)
0.071 (1.80)
1
2
3
PIN 1
0.026 (0.65) BSC
0.051 (1.30)
BSC
0.039 (1.00)
0.043 (1.10)
0.031 (0.80)
0.031 (0.80)
0.004 (0.10)
0.012 (0.30)
0.000 (0.00)
0.006 (0.15)
SEATING
PLANE
0.007 (0.18)
0.004 (0.10)
8o
0o
0.012 (0.30)
0.004 (0.10)
Figure 1. 5-Lead Plastic Surface Mount Package [SC70]
(KS-5)
Dimensions shown in millimeters
ORDERING GUIDE
Model
ADCMP370AKS-R7
ADCMP370AKS-RL
ADCMP371AKS-R7
ADCMP371AKS-RL
Temperature Range
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Quantity
3k
10k
3k
10k
© 2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective companies.
Printed in the U.S.A.
PR04745-0-4/04(PrB)
Rev. PrB | Page 8 of 8
Package Type
SC70-5
SC70-5
SC70-5
SC70-5
Branding
M1F
M1F
M1G
M1G
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