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19-1842; Rev 1; 7/01
Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators
General Description
The MAX9021/MAX9022/MAX9024 single/dual/quad comparators are optimized for low-power consumption while still providing a fast output response. They are designed for single-supply applications from 2.5V to 5.5V, but can also operate from dual supplies. These comparators have a 3s propagation delay and consume 2.8A of supply current per comparator over the -40C to +125C operating temperature range. The combination of low-power, single-supply operation down to 2.5V, and ultra-small footprint makes these devices ideal for portable applications. The MAX9021/MAX9022/MAX9024 have 4mV of built-in hysteresis to provide noise immunity and prevent oscillations even with a slow-moving input signal. The input common-mode range extends from the negative supply to within 1.1V of the positive supply. The design of the comparator-output stage substantially reduces switching current during output transitions, eliminating powersupply glitches. The MAX9021 single comparator is available in tiny 5pin SC70 and SOT23 packages. The MAX9022 dual comparator is available in 8-pin SOT23, MAX, and SO packages, and the MAX9024 quad comparator is available in 14-pin TSSOP and SO packages.
Features
o Low-Cost Solution Available in Space-Saving SC70 Packages (Half the Size of SOT23) o Low 2.8A Supply Current o 3s Propagation Delay o Internal 4mV Comparator Hysteresis o Comparator Output Swings Rail-to-Rail(R) o 2.5 to 5.5V Single-Supply Voltage Range o No Phase Reversal for Overdriven Inputs o Space-Saving Packages 5-Pin SC70 (MAX9021) 8-Pin SOT23 (MAX9022) 8-Pin MAX (MAX9022) 14-Pin TSSOP (MAX9024)
MAX9021/MAX9022/MAX9024
Ordering Information
PART MAX9021AXK-T MAX9021AUK-T MAX9022AKA-T MAX9022AUA MAX9022ASA MAX9024AUD MAX9024ASD TEMP RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C PIN-PACKAGE 5 SC70-5 5 SOT23-5 8 SOT23-8 8 MAX 8 SO 14 TSSOP 14 SO
Applications
Battery-Powered Portable Systems Mobile Communications Sensor-Signal Detection Photodiode Preamps Digital Line Receivers Keyless Entry Systems Threshold Detectors/ Discriminators
Typical Application Circuit appears at end of data sheet.
Pin Configurations
TOP VIEW
IN+ 1 5 VDD OUTA 1 INA- 2 8 7 VDD OUTB INBVDD 4 IN- 3 4 OUT VSS 4 5 INB+ INB+ 5 INB- 6 OUTA 1 INAINA+ 6 2 3 14 OUTD 13 IND12 IND+
VSS 2
MAX9021
MAX9022
INA+ 3
MAX9024
11 VSS 10 INC+ 9 8 INCOUTC
SC70/SOT23
S0T23/MAX/SO
OUTB 7
TSSOP/SO Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators MAX9021/MAX9022/MAX9024
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD to VSS) ....................................-0.3V to +6V Voltage Inputs (IN+, IN- to VSS). ................-0.3V to (VDD + 0.3V) Differential Input Voltage (IN+ to IN-)....................................6.6V Output Short-Circuit Duration ..................2s to Either VDD or VSS Current into Any Pin ............................................................20mA Continuous Power Dissipation (TA = +70C) 5-Pin SC70 (derate 3.1mW/C above +70C) ...............247mW 5-Pin SOT23 (derate 7.1mW/C above +70C).............571mW 8-Pin SOT23 (derate 9.1mW/C above +70C).............727mW 8-Pin MAX (derate 4.5mW/C above +70C) ..............362mW 8-Pin SO (derate 5.88mW/C above +70C).................471mW 14-Pin TSSOP (derate 9.1mW/C above +70C) ..........727mW 14-Pin SO (derate 8.3mW/C above +70.......................667mW Operating Temperature Range Automotive Application...................................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = 5V, VSS = 0, VCM = 0, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Operating Voltage Range Supply Current Per Comparator Input Offset Voltage Input Offset Voltage Temperature Coefficient Hysteresis Input Bias Current Input Offset Current Common-Mode Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio IBIAS IOS VCM CMRR PSRR Guaranteed by CMRR test VSS VCM (VDD - 1.1V), VDD = 5.5V VDD = 2.5V to 5.5V VOH = VDD - VOUT, (VIN+ - VIN-) 20mV VOL = VOUT - VSS, (VIN- - VIN+) 20mV RL = 10k, CL = 15pF (Note 4) RL = 10k, CL = 15pF CL No sustained oscillations ISOURCE = 10A ISOURCE = 4mA ISINK = 10A ISINK = 4mA VOD = 10mV VOD = 100mV VSS 70 60 100 80 2 160 2 180 50 8 3 20 150 150 400 mA s ns ns pF 400 mV SYMBOL VDD IDD VOS TCVOS (Note 3) (Note 2) CONDITIONS Guaranteed by PSRR test MIN 2.5 2.8 1 1 4 3 2 80 60 VDD - 1.1 TYP MAX 5.5 5 8 UNITS V A mV V/C mV nA nA V dB dB
Output-Voltage Swing
VOL, VOH
Output Short-Circuit Current Propagation Delay Rise and Fall Time Power-On Time Maximum Capacitive Load
ISC tpd+, tpdtR , tF
RL = 10k, CL = 15pF (Note 5)
Note 1: Note 2: Note 3: Note 4: Note 5:
All devices are production tested at 25C. All temperature limits are guaranteed by design. Comparator Input Offset is defined as the center of the hysteresis zone. Hysteresis is defined as the difference of the trip points required to change comparator output states. VOD is the overdrive voltage beyond the offset and hysteresis-determined trip points. Rise and fall times are measured between 10% and 90% at OUT.
2
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Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators MAX9021/MAX9022/MAX9024
Typical Operating Characteristics
(VDD = 5V, VSS = 0, VCM = 0, RL = 10k, CL = 15pF, VOD = 100mV, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9021/2/4 toc01
SUPPLY CURRENT vs. TEMPERATURE
MAX9021/2/4 toc02
SUPPLY CURRENT vs. OUTPUT TRANSITION FREQUENCY
MAX9021/2/4 toc03
3.0
3.0
1000
SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
2.9
2.9
100
2.8
2.8
2.7
10
2.7 2.6 1 -50 -25 0 25 50 75 100 125 0.01 0.1 1 10 100 1000 TEMPERATURE (C) OUTPUT TRANSITION FREQUENCY (kHz)
2.6 2 3 4 SUPPLY VOLTAGE (V) 5 6
2.5
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX9021/2/4 toc04
OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT
MAX9021/2/4 toc05
OUTPUT LOW VOLTAGE vs. SINK CURRENT
MAX9021/2/4 toc06
1.4 1.2 INPUT OFFSET VOLTAGE (mV) 1.0 0.8 0.6 0.4
500
500
300
OUTPUT LOW VOLTAGE (mV)
400 (VDD - VOUT) (mV)
400
300
200
200
100 0.2 0 -50 -25 0 25 50 75 100 125 TEMPERATURE (C) 0 0 2 4 6 8 10 SOURCE CURRENT (mA)
100
0 0 2 4 6 8 10 SINK CURRENT (mA)
OUTPUT SHORT-CIRCUIT CURRENT vs. TEMPERATURE
OUTPUT SHORT-CIRCUIT CURRENT (mA)
MAX9021/2/4 toc07
PROPAGATION DELAY vs. CAPACITIVE LOAD (VDD = 2.7V)
MAX9021/2/4 toc08
PROPAGATION DELAY vs. CAPACITIVE LOAD (VDD = 5V)
MAX9021/2/4 toc09
65
5
5
PROPAGATION DELAY (s)
PROPAGATION DELAY (s)
60
4
4 tPD3
55 SOURCE CURRENT 50 SINK CURRENT 45
3
tPD-
2
tPD+
2
tPD+
1
1
40 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
0 0 500 1000 1500 2000 CAPACITIVE LOAD (pF)
0 0 500 1000 1500 2000 CAPACITIVE LOAD (pF)
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Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators MAX9021/MAX9022/MAX9024
Typical Operating Characteristics (continued)
(VDD = 5V, VSS = 0, VCM = 0, RL = 10k, CL = 15pF, VOD = 100mV, TA = +25C, unless otherwise noted.)
PROPAGATION DELAY vs. TEMPERATURE
MAX9021/2/4 toc10
PROPAGATION DELAY vs. INPUT OVERDRIVE VOLTAGE
MAX9021/2/4 toc11
PROPAGATION DELAY (tPD+)
MAX9021/2/4 toc12
5
9 8 PROPAGATION DELAY (s) 7 6 5 4 3 2 1 tPD+ tPD-
PROPAGATION DELAY (s)
4
tPD-
IN+ 100mV/div
3
2
tPD+
VOUT 2.5V/div
1
0 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
0 0 20 40 60 80 100 120 140 1s/div INPUT OVERDRIVE VOLTAGE (mV)
PROPAGATION DELAY (tPD-)
MAX9021/2/4 toc13
OUTPUT SWITCHING CURRENT, RISING
MAX9021/2/4 toc14
OUTPUT SWITCHING CURRENT, FALLING
MAX9021/2/4 toc15
IN+ 100mV/div
IN+ - IN 200mV/div VOUT 5V/div
IN+ - IN200mV/div VOUT 5V/div
VOUT 2.5V/div SWITCHING CURRENT 400A/div SWITCHING CURRENT 400A/div
1s/div
20s/div
20s/div
10kHz RESPONSE (VOD = 10mV)
MAX9021/2/4 toc16
10kHz RESPONSE (VOD = 100mV)
MAX9021/2/4 toc17
POWER-UP TIME
MAX9021/2/4 toc18
IN+ - IN 10mV/div
IN+ - IN100mV/div
VDD 2.5V/div
OUT 2.5V/div
OUT 2.5V/div
VOUT 2.5V/div
10s/div
10s/div
2s/div
4
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Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators
Pin Description
PIN NAME MAX9021 1 2 3 4 5 -- -- -- -- -- -- -- -- -- -- -- -- MAX9022 -- 4 -- -- 8 1 2 3 5 6 7 -- -- -- -- -- -- MAX9024 -- 11 -- -- 4 1 2 3 5 6 7 8 9 10 12 13 14 IN+ VSS INOUT VDD OUTA INAINA+ INB+ INBOUTB OUTC INCINC+ IND+ INDOUTD Comparator Noninverting Input Negative Supply Voltage Comparator Inverting Input Comparator Output Positive Supply Voltage. Bypass with a 0.1F capacitor to GND. Comparator A Output Comparator A Inverting Input Comparator A Noninverting Input Comparator B Noninverting Input Comparator B Inverting Input Comparator B Output Comparator C Output Comparator C Inverting Input Comparator C Noninverting Input Comparator D Noninverting Input Comparator D Inverting Input Comparator D Output FUNCTION
MAX9021/MAX9022/MAX9024
Detailed Description
The MAX9021/MAX9022/MAX9024 are single/dual/ quad, low-cost, low-power comparators that consume only 2.8A and provide a propagation delay, tPD, typically 3s. They have an operating-supply voltage from 2.5V to 5.5V when operating from a single supply and from 1.25V to 2.75V when operating from dual power supplies. Their common-mode input voltage range extends from the negative supply to within 1.1V of the positive supply. Internal hysteresis ensures clean output switching, even with slow-moving input signals.
tor's output sets the trip voltage. Therefore, the trip voltage is related to the output voltage. These comparators have 4mV internal hysteresis. Additional hysteresis can be generated with two resistors, using positive feedback (Figure 1). Use the following procedure to calculate resistor values: 1) Find the trip points of the comparator using these formulas: VTH = VREF + ((VDD - VREF)R2) / (R1 + R2) VTL = VREF(1 - (R2 / (R1 + R2)) where VTH is the threshold voltage at which the comparator switches its output from high to low as VIN rises above the trip point. VTL is the threshold voltage at which the comparator switches its output from low to high as VIN drops below the trip point.
Applications Information
Adding Hysteresis
Hysteresis extends the comparator's noise margin by increasing the upper threshold and decreasing the lower threshold. A voltage-divider from the compara-
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5
Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators MAX9021/MAX9022/MAX9024
R1 VDD VDD VDD IN+ OUT VIN INVIN 10k VDD IN+ OUT INVSS
R2 VREF
MAX9021
VSS
0.1F
MAX9021
Figure 1. Additional Hysteresis
Figure 2. Time Averaging of the Input Signal for Data Recovery
2) The hysteresis band will be: VHYS = VTH - VTL = VDD(R2 / (R1 + R2)) 3) In this example, let VDD = 5V and VREF = 2.5V. VTH = 2.5V + 2.5V(R2 / (R1 + R2)) and VTL = 2.5V[(1 - (R2 / (R1 + R2))] 4) Select R2. In this example, we will choose 1k. 5) Select VHYS. In this example, we will choose 50mV. 6) Solve for R1. VHYS = VDD(R2 / (R1 + R2)) 0.050V = 5(1000/(R1 + 1000)) V where R1 100k, VTH = 2.525V, and VTL = 2.475V. The above-described design procedure assumes railto-rail output swing. If the output is significantly loaded, the results should be corrected.
Board Layout and Bypassing
Use 100nF bypass as a starting point. Minimize signal trace lengths to reduce stray capacitance. Minimize the capacitive coupling between IN- and OUT. For slowmoving input signals (rise time > 1ms), use a 1nF capacitor between IN+ and IN-.
Biasing for Data Recovery
Digital data is often embedded into a bandwidth and amplitude-limited analog path. Recovering the data can be difficult. Figure 2 compares the input signal to a time-averaged version of itself. This self-biases the threshold to the average input voltage for optimal noise margin. Even severe phase distortion is eliminated from the digital output signal. Be sure to choose R1 and C1 so that: CAR >> 1 / (2R1C1) where CAR is the fundamental carrier frequency of the digital data stream.
6
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Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators
Typical Application Circuit
VDD VIN R1 VREF IN+ OUT INRL R2 0.1F VDD
Chip Information
MAX9021 TRANSISTOR COUNT: 106 MAX9022 TRANSISTOR COUNT: 212 MAX9024 TRANSISTOR COUNT: 424
MAX9021/MAX9022/MAX9024
MAX9021
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
SC70, 5L.EPS
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Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators MAX9021/MAX9022/MAX9024
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
SOT5L.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOT23, 8L.EPS

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