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Single 0.275% Comparator and Reference with Dual Polarity Outputs ADCMP361
FEATURES
400 mV 0.275% threshold Supply range: 1.7 V to 5.5 V Low quiescent current: 6.5 A typical Input range includes ground Internal hysteresis: 9.3 mV typical Low input bias current: 5 nA maximum Dual open-drain outputs Small SOT-23 package
FUNCTIONAL BLOCK DIAGRAM
VDD
ADCMP361
IN OUT
400mV OUT
06496-001
APPLICATIONS
Li-Ion monitoring Threshold detectors Relay driving Optoisolator driving Industrial control systems Handheld instruments
GND
Figure 1.
GENERAL DESCRIPTION
The ADCMP361 is a single low power, high accuracy comparator with a 400 mV reference in a 5-lead SOT-23 package. The internal 400 mV reference provides the ability to monitor low voltage supplies. The device operates on a supply voltage from 1.7 V to 5.5 V and only draws 6.5 A typical, making it suitable for low power system monitoring and portable applications. Hysteresis is included in the comparators. There are dual open-drain outputs to enable the comparator and reference circuit to be used in an inverting or noninverting configuration. The outputs can be pulled to any voltage up to a maximum of 5.5 V. The output stage is guaranteed to sink greater than 5 mA over temperature The device is suitable for portable, commercial, industrial, and automotive applications.
R1 4.7M IN 3V + Li-Ion CELL R2 1M + - OUT 400mV
06496-029
VDD
ADCMP361
OUT
R3 1M
C1 100nF
GND
Figure 2. Typical Li-Ion Monitoring Application
DISCHARGING VBATT 2.280V 2.271V CHARGING
VOUT
06496-030
Figure 3. Li-Ion Monitoring Waveforms
Rev. 0
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: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2007 Analog Devices, Inc. All rights reserved.
ADCMP361 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 Thermal Characteristics .............................................................. 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ..............................................6 Application Information................................................................ 11 Comparators and Internal Reference ...................................... 11 Power Supply............................................................................... 11 Inputs ........................................................................................... 11 Outputs ........................................................................................ 11 Adding Hysteresis....................................................................... 11 Outline Dimensions ....................................................................... 12 Ordering Guide .......................................................................... 12
REVISION HISTORY
2/07--Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADCMP361 SPECIFICATIONS
VDD = 1.7 V to 5.5 V, -40C TA +125C, unless otherwise noted. Table 1.
Parameter THRESHOLDS 1 Rising Input Threshold Voltage Min 399.3 391.2 393.1 393.1 381.1 381.2 381.0 2 Typ 400.4 400.4 400.4 400.4 391.1 391.1 391.1 9.3 16 6.5 7.0 0.01 0.01 140 140 0.01 0.01 10 8 0.5 0.07 9 10 5 5 220 220 1 1 Max 401.5 407.7 405.9 405.8 400.9 398.4 398.2 13.5 0.275 Unit mV mV mV mV mV mV mV mV % ppm/C A A nA nA mV mV A A s s s s Test Conditions/Comments VDD = 3.3 V, TA = 25C VDD = 1.7 V VDD = 3.3 V VDD = 5.5 V VDD = 1.7 V VDD = 3.3 V VDD = 5.5 V TA = 25C, VDD = 3.3 V
Falling Input Threshold Voltage
Hysteresis = VTH(R) - VTH(F) Threshold Voltage Accuracy Threshold Voltage Temperature Coefficient POWER SUPPLY Supply Current INPUT CHARACTERISTICS Input Bias Current OPEN-DRAIN OUTPUTS Output Low Voltage 2 Output Leakage Current 3 DYNAMIC PERFORMANCE High-to-Low Propagation Delay2, 4 Low-to-High Propagation Delay2, 4 Output Rise time2, 4 Output Fall time2, 4
1 2
VDD = 1.7 V VDD = 5.5 V VDD = 1.7 V, VIN = VDD VDD = 1.7 V, VIN = 0.1 V VDD = 1.7 V, IOUT = 3 mA VDD = 5.5 V, IOUT = 5 mA VDD = 1.7 V, VOUT = VDD VDD = 1.7 V, VOUT = 5.5 V VDD = 5 V, VOL = 400 mV VDD = 5 V, VOH = 0.9 x VDD VDD = 5 V, VO = (0.1 to 0.9) x VDD VDD = 5 V, VO = (0.1 to 0.9) x VDD
RL = 100 k, VO = 2 V swing. 10 mV input overdrive. 3 VIN = 40 mV overdrive. 4 RL = 10 k.
Rev. 0 | Page 3 of 12
ADCMP361 ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter VDD IN OUT, OUT Operating Temperature Range Storage Temperature Range Lead Temperature Soldering (10 sec) Vapor Phase (60 sec) Infrared (15 sec) Rating -0.3 V to +6 V -0.3 V to +6 V -0.3 V to +6 V -40C to +125C -65C to +150C 300C 215C 220C
THERMAL CHARACTERISTICS
JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 3. Thermal Resistance
Package Type 5-Lead SOT-23 JA 240 Unit C/W
ESD CAUTION
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.
Rev. 0 | Page 4 of 12
ADCMP361 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
OUT GND IN
1 2 3 5
OUT
ADCMP361
4
VDD
Figure 4. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. 1 2 3 4 5 Mnemonic OUT GND IN VDD OUT Description Noninverting Open-Drain Output. Ground. Monitors analog input voltage on comparator. The other input of the comparator is connected to a 400 mV reference. Power Supply. Inverting Open-Drain Output.
Rev. 0 | Page 5 of 12
06496-002
TOP VIEW (Not to Scale)
ADCMP361 TYPICAL PERFORMANCE CHARACTERISTICS
60 50 VDD = 5V TA = 25C 40 VDD = 5V TA = 25C 50
PERCENT OF UNITS (%)
40
PERCENT OF UNITS (%)
30
30
20
20
10
10
06496-003
394 395 396 397 398 399 400 401 402 403 404 405 406 RISING INPUT THRESHOLD VOLTAGE (mV)
388 389 390 391 392 393 394 395 396 397 398 399 400 FALLING INPUT THRESHOLD VOLTAGE (mV)
Figure 5. Distribution of Rising Input Threshold Voltage
35 30
Figure 8. Distribution of Falling Input Threshold Voltage
404
RISING INPUT THRESHOLD VOLTAGE (mV)
VDD = 5V TA = 25C
PERCENT OF UNITS (%)
25 20 15 10 5 0
402
1 2 3 4
FOUR TYPICAL PARTS VDD = 5V
400
398
06496-004
6.0 6.4 6.8 7.2 7.6 8.0 8.4 8.8 9.2 9.6 10.0 10.4 10.8 HYSTERESIS (mV)
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
Figure 6. Distribution of Hysteresis
401
Figure 9. Rising Input Threshold Voltage vs. Temperature
12.0 11.5 11.0 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 -40
RISING INPUT THRESHOLD VOLTAGE (mV)
TA = -40C
400 TA = +25C TA = +85C 398 HYSTERESIS (mV) 399
VDD VDD VDD VDD
= 1.8V = 2.5V = 3.3V = 5.0V
397 TA = +125C 396
2.2
2.7
3.2
3.7
4.2
4.7
5.2
5.7
06496-007
-20
0
20
40
60
80
100
120
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
Figure 7. Rising Input Threshold Voltage vs. Supply Voltage
Figure 10. Hysteresis vs. Temperature
Rev. 0 | Page 6 of 12
06496-010
395 1.7
06496-005
396 -40
06496-006
0
0
ADCMP361
12 TA = +125C 11
1
0
THRESHOLD SHIFT (mV)
TA = +25C
10
HYSTERESIS (mV)
9 8 7 6 5 4 1.7 TA = +85C
-1
-2
TA = -40C TA = +25C TA = +85C TA = +125C
TA = -40C
-3
-4
06496-008
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
Figure 11. Hysteresis vs. Supply Voltage
Figure 14. Minimum Supply Voltage
10
50
NO LOAD CURRENT
9
SUPPLY CURRENT (mA)
40 SUPPLY CURRENT (A)
8 TA = +85C 7
TA = +125C
30
TA = +25C 6 TA = -40C 5
20 TA = +25C TA = +85C TA = +125C TA = -40C 0 0.5 1.0 SUPPLY VOLTAGE (V) 1.5
06496-012
10
2.2
2.7
3.2
3.7
4.2
4.7
5.2
SUPPLY VOLTAGE (V)
Figure 12. Quiescent Supply Current vs. Supply Voltage
06496-009
4 1.7
0
Figure 15. Start-Up Supply Current
1000
TA = -40C
VDD VDD VDD VDD
= 5.0V = 3.3V = 2.5V = 1.7V
1000
TA = 25C
VDD VDD VDD VDD
= 5.0V = 3.3V = 2.5V = 1.7V
SUPPLY CURRENT (A)
100
SUPPLY CURRENT (A)
100
10
10
06496-013
0.01
0.1
1
10
100
0.01
0.1
1
10
100
OUTPUT SINK CURRENT (mA)
OUTPUT SINK CURRENT (mA)
Figure 13. Supply Current vs. Output Sink Current
Figure 16. Supply Current vs. Output Sink Current
Rev. 0 | Page 7 of 12
06496-014
1 0.001
1 0.001
06496-011
2.2
2.7
3.2
3.7
4.2
4.7
5.2
5.7
-5 1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
ADCMP361
1000 TA = 85C VDD VDD VDD VDD = 5.0V = 3.3V = 2.5V = 1.7V
INPUT BIAS CURRENT (nA)
10k TA = +125C 1k
CURRENT IS GOING OUT OF THE DEVICE. VDD = 5V -0.3V < VIB < 0V
SUPPLY CURRENT (A)
100
100 TA = +85C
10
TA = +25C
10
1
TA = -40C
06496-015
0.01
0.1
1
10
100
-0.2
-0.1
0
OUTPUT SINK CURRENT (mA)
INPUT VOLTAGE (V)
Figure 17. Supply Current vs. Output Sink Current
Figure 20. Below Ground Input Bias Current
3
10
1 TA = +125C TA = +85C TA = +25C TA = -40C
INPUT BIAS CURRENT (nA) INPUT BIAS CURRENT (nA)
1
TA = +125C
-1
TA = +85C
-3
0.1
TA = +25C
TA = -40C
-5
06496-017
0
0.2
0.4
0.6
0.8
1.0
1
2
3 INPUT VOLTAGE (V)
4
5
INPUT VOLTAGE (V)
Figure 18. Low Level Input Bias Current
1000 TA = 25C
OUTPUT SATURATION VOLTAGE (mV)
OUTPUT SATURATION VOLTAGE (mV)
Figure 21. High Level Input Bias Current
1000
VDD VDD VDD VDD 100
= 5.0V = 3.3V = 2.5V = 1.8V
TA = -40C VDD = 5.0V VDD = 3.3V VDD = 2.5V VDD = 1.8V
100
10
10
06496-019
0.01
0.1
1
10
0.01
0.1
1
10
OUTPUT SINK CURRENT (mA)
OUTPUT SINK CURRENT (mA)
Figure 19. Output Saturation Voltage vs. Output Sink Current
Figure 22. Output Saturation Voltage vs. Output Sink Current
Rev. 0 | Page 8 of 12
06496-020
1 0.001
1 0.001
06496-018
-7
CURRENT IS POSITIVE GOING INTO THE DEVICE. VDD = 5V 0V < VIB < 1V
0.01
CURRENT IS GOING INTO THE DEVICE VDD = 5V VIB > 1V
06496-016
1 0.001
0.1 -0.3
ADCMP361
1000
OUTPUT SATURATION VOLTAGE (mV)
SHORT-CIRCUIT CURRENT (mA)
TA = 85C VDD = 5.0V VDD = 3.3V VDD = 2.5V VDD = 1.8V
80 VDD = 5V 70 60 50 TA = +85C 40 30 20 10 TA = +125C TA = +25C TA = -40C
100
10
06496-021
0.01
0.1
1
10
0
2 OUTPUT VOLTAGE (V)
4
OUTPUT SINK CURRENT (mA)
Figure 23. Output Saturation Voltage vs. Output Sink Current
Figure 26. Short-Circuit Current vs. Output Voltage
70 60
SHORT-CIRCUIT CURRENT (mA)
TA = 25C
10 VDD = 5.0V
OUTPUT LEAKAGE CURRENT (nA)
VDD = 5V TA = +125C
50 40 30 20 10 0 VDD = 3.3V
1 TA = +85C TA = +25C 0.1 TA = -40C
VDD = 2.5V
VDD = 1.8V
0.01
06496-023
0
2 OUTPUT VOLTAGE (V)
4
0
1
2
3
4
5
OUTPUT VOLTAGE (V)
Figure 24. Short-Circuit Current vs. Output Voltage
60 100
Figure 27. Output Leakage Current vs. Output Voltage
TA = 25C
50
PROPAGATION DELAY (s)
LH NONINV LH INV HL NONINV HL INV
RISE AND FALL TIMES (s)
VDD = 5V CL = 20pF TA = 25C
10 RISE 1
40
30
20
0.1 FALL 0.01 0.1
10
06496-025
0
20
40
60
80
100
1
10
100
1000
INPUT OVERDRIVE (mV)
OUTPUT PULL-UP RESISTOR (k)
Figure 25. Propagation Delay vs. Input Overdrive
Figure 28. Rise and Fall Times vs. Output Pull-Up Resistor
Rev. 0 | Page 9 of 12
06496-027
0
06496-024
0.001
06496-022
1 0.001
0
ADCMP361
NON INV (OUTA)
2
INV (OUTB)
3
VIN (+INA, -INB)
1
CH1 50.0mV CH3 5.00V
CH2 5.00V
M20.0s
CH1
7mV
Figure 29. Noninverting and Inverting Comparators Propagation Delay
06496-026
Rev. 0 | Page 10 of 12
ADCMP361 APPLICATION INFORMATION
The ADCMP361 is a low power comparator and reference circuit featuring a 400 mV reference that operates from 1.7 V to 5.5 V. The comparator is 0.275% accurate with a built-in hysteresis of 9.3 mV. There are two outputs, one the inverse of the other. This enables the ADCMP361 to be used as an inverting or a noninverting comparator circuit. These opendrain outputs are capable of sinking 40 mA.
OUTPUTS
The open-drain comparator outputs are limited to the maximum specified VDD voltage range, regardless of the VDD voltage. These outputs are capable of sinking up 40 mA.
ADDING HYSTERESIS
To prevent oscillations at the output caused by noise or slowly moving signals passing the switching threshold, each comparator has built-in hysteresis of approximately 9.3 mV. Positive feedback can be used to increase hysteresis.
VIN R1 IN R2 OUT IBIAS OUT 400mV
06496-028
COMPARATORS AND INTERNAL REFERENCE
The comparator has one input available externally; the other comparator input is connected internally to the 400 mV reference. The rising input threshold voltage of the comparators is designed to be equal to that of the reference.
VDD
ADCMP361
POWER SUPPLY
The ADCMP361 is designed to operate from 1.7 V to 5.5 V. A 100 nF decoupling capacitor is recommended between VDD and GND.
INPUTS
The comparator input is limited to the maximum VDD voltage range. The voltage on these inputs can be above VDD but never above the maximum allowed VDD voltage. When adding a resistor string to the input, care must be taken when choosing resistor values. This is due to the fact that the input bias current will be in parallel with the bottom resistor, R2, of the input resistor divider string. This bottom resistor must therefore be chosen carefully in order to reduce the error introduced by this bias current (see Figure 30).
GND
Figure 30. Input Bias Current Effect on Input Resistor String
Rev. 0 | Page 11 of 12
ADCMP361 OUTLINE DIMENSIONS
2.90 BSC
5 4
1.60 BSC
1 2 3
2.80 BSC
PIN 1 0.95 BSC 1.30 1.15 0.90 1.90 BSC
1.45 MAX
0.22 0.08 10 5 0 0.60 0.45 0.30
0.15 MAX
0.50 0.30
SEATING PLANE
COMPLIANT TO JEDEC STANDARDS MO-178-A A
Figure 31. 5-Lead Small Outline Transistor Package [SOT-23] (RJ-5) Dimensions shown in millimeters
ORDERING GUIDE
Model ADCMP361YRJZ-REEL7 1
1
Temperature Range -40C to +125C
Package Description 5-Lead SOT-23
Package Option RJ-5
Branding M99
Z = Pb-free part.
(c)2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06496-0-2/07(0)
Rev. 0 | Page 12 of 12

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