19-1842; Rev 2; 1/07 Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators 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(R), and SO packages, and the MAX9024 quad comparator is available in 14-pin TSSOP and SO packages. Features Low-Cost Solution Available in Space-Saving SC70 Packages (Half the Size of SOT23) Low 2.8A Supply Current 3s Propagation Delay Internal 4mV Comparator Hysteresis Comparator Output Swings Rail-to-Rail 2.5 to 5.5V Single-Supply Voltage Range No Phase Reversal for Overdriven Inputs Space-Saving Packages 5-Pin SC70 (MAX9021) 8-Pin SOT23 (MAX9022) 8-Pin MAX (MAX9022) 14-Pin TSSOP (MAX9024) Applications Battery-Powered Portable Systems Mobile Communications Sensor-Signal Detection Photodiode Preamps Digital Line Receivers Keyless Entry Systems Threshold Detectors/ Discriminators Ordering Information PINPACKAGE PKG CODE MAX9021AXK-T -40C to +125C 5 SC70-5 X5-1 MAX9021AUK-T -40C to +125C 5 SOT23-5 U5-1 MAX9022AKA-T -40C to +125C 8 SOT23-8 K8-5 MAX9022AUA -40C to +125C 8 MAX U8-1 MAX9022ASA -40C to +125C 8 SO S8-2 MAX9024AUD -40C to +125C 14 TSSOP U14-1 -40C to +125C 14 SO S14-2 PART TEMP RANGE MAX9024ASD Typical Application Circuit appears at end of data sheet. Pin Configurations TOP VIEW IN+ 1 VSS 2 5 VDD OUTA 1 INA- 2 MAX9021 8 VDD 7 OUTB MAX9022 3 6 INB- VSS 4 5 INB+ INA+ OUTA 1 INA- 2 13 IND- INA+ 3 12 IND+ VDD 4 IN- 3 4 SC70/SOT23 OUT S0T23/MAX/SO 14 OUTD MAX9024 11 VSS INB+ 5 10 INC+ INB- 6 9 INC- OUTB 7 8 OUTC TSSOP/SO MAX is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX9021/MAX9022/MAX9024 General Description MAX9021/MAX9022/MAX9024 Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators 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 Current into Input Pins ......................................................20mA 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 SYMBOL VDD Supply Current Per Comparator IDD Input Offset Voltage VOS Input Offset Voltage Temperature Coefficient MIN (Note 2) (Note 3) IOS Common-Mode Voltage Range VCM MAX UNITS 5.5 V 2.8 5 A 1 8 mV 1 V/C 4 IBIAS Input Offset Current TYP 2.5 TCVOS Hysteresis Input Bias Current CONDITIONS Guaranteed by PSRR test 3 2 Guaranteed by CMRR test VSS mV 80 nA 60 nA VDD - 1.1 V Common-Mode Rejection Ratio CMRR VSS VCM (VDD - 1.1V), VDD = 5.5V 70 100 dB Power-Supply Rejection Ratio PSRR VDD = 2.5V to 5.5V 60 80 dB Output-Voltage Swing Output Short-Circuit Current VOL, VOH tpd+, tpd- Rise and Fall Time tR , tF Power-On Time Note 1: Note 2: Note 3: Note 4: Note 5: 2 VOL = VOUT - VSS, (VIN- - VIN+) 20mV ISOURCE = 10A 2 ISOURCE = 4mA 160 ISINK = 10A 2 ISINK = 4mA 180 ISC Propagation Delay Maximum Capacitive Load VOH = VDD - VOUT, (VIN+ - VIN-) 20mV CL 50 RL = 10k, CL = 15pF (Note 4) VOD = 10mV 8 VOD = 100mV 3 400 mV 400 mA s RL = 10k, CL = 15pF (Note 5) 20 ns RL = 10k, CL = 15pF 150 ns No sustained oscillations 150 pF 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. _______________________________________________________________________________________ Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators SUPPLY CURRENT vs. SUPPLY VOLTAGE 2.8 2.7 MAX9021/2/4 toc03 2.9 1000 SUPPLY CURRENT (A) 2.8 MAX9021/2/4 toc02 2.9 3.0 SUPPLY CURRENT (A) MAX9021/2/4 toc01 3.0 SUPPLY CURRENT (A) SUPPLY CURRENT vs. OUTPUT TRANSITION FREQUENCY SUPPLY CURRENT vs. TEMPERATURE 100 10 2.7 2.6 1 2.5 3 4 5 6 -50 -25 0 1.0 0.8 0.6 100 0.01 125 100 10 1 0.1 OUTPUT TRANSITION FREQUENCY (kHz) OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT OUTPUT LOW VOLTAGE vs. SINK CURRENT MAX9021/2/4 toc05 400 (VDD - VOUT) (mV) INPUT OFFSET VOLTAGE (mV) 1.2 75 500 MAX9021/2/4 toc04 1.4 50 TEMPERATURE (C) SUPPLY VOLTAGE (V) INPUT OFFSET VOLTAGE vs. TEMPERATURE 25 300 200 0.4 500 OUTPUT LOW VOLTAGE (mV) 2 100 1000 MAX9021/2/4 toc06 2.6 400 300 200 100 0.2 0 0 -25 0 25 50 75 100 2 4 6 8 10 2 4 6 8 10 PROPAGATION DELAY vs. CAPACITIVE LOAD (VDD = 2.7V) PROPAGATION DELAY vs. CAPACITIVE LOAD (VDD = 5V) 5 5 MAX9021/2/4 toc07 55 SOURCE CURRENT 50 SINK CURRENT 4 3 tPD- 2 tPD+ -25 0 25 50 75 TEMPERATURE (C) 100 125 tPD3 2 tPD+ 0 0 40 4 1 1 45 MAX9021/2/4 toc09 OUTPUT SHORT-CIRCUIT CURRENT vs. TEMPERATURE PROPAGATION DELAY (s) SINK CURRENT (mA) MAX9021/2/4 toc08 SOURCE CURRENT (mA) 60 -50 0 TEMPERATURE (C) 65 OUTPUT SHORT-CIRCUIT CURRENT (mA) 0 0 125 PROPAGATION DELAY (s) -50 0 500 1000 1500 CAPACITIVE LOAD (pF) 2000 0 500 1000 1500 2000 CAPACITIVE LOAD (pF) _______________________________________________________________________________________ 3 MAX9021/MAX9022/MAX9024 Typical Operating Characteristics (VDD = 5V, VSS = 0, VCM = 0, RL = 10k, CL = 15pF, VOD = 100mV, TA = +25C, unless otherwise noted.) Typical Operating Characteristics (continued) (VDD = 5V, VSS = 0, VCM = 0, RL = 10k, CL = 15pF, VOD = 100mV, TA = +25C, unless otherwise noted.) PROPAGATION DELAY vs. INPUT OVERDRIVE VOLTAGE 3 2 tPD+ MAX9021/2/4 toc11 tPD- 8 7 IN+ 100mV/div 6 5 4 tPD- VOUT 2.5V/div 3 2 1 PROPAGATION DELAY (tPD+) 9 PROPAGATION DELAY (s) 4 MAX9021/2/4 toc10 5 MAX9021/2/4 toc12 PROPAGATION DELAY vs. TEMPERATURE PROPAGATION DELAY (s) tPD+ 1 0 -25 0 25 50 75 100 0 125 20 40 60 80 100 120 140 INPUT OVERDRIVE VOLTAGE (mV) PROPAGATION DELAY (tPD-) OUTPUT SWITCHING CURRENT, RISING IN+ 100mV/div IN+ - IN200mV/div 1s/div OUTPUT SWITCHING CURRENT, FALLING MAX9021/2/4 toc14 TEMPERATURE (C) MAX9021/2/4 toc13 -50 MAX9021/2/4 toc15 0 IN+ - IN200mV/div VOUT 5V/div VOUT 5V/div SWITCHING CURRENT 400A/div SWITCHING CURRENT 400A/div VOUT 2.5V/div 20s/div 10kHz RESPONSE (VOD = 10mV) 10kHz RESPONSE (VOD = 100mV) POWER-UP TIME IN+ - IN10mV/div 10s/div VDD 2.5V/div VOUT 2.5V/div OUT 2.5V/div OUT 2.5V/div 4 IN+ - IN100mV/div MAX9021/2/4 toc18 20s/div MAX9021/2/4 toc17 1s/div MAX9021/2/4 toc16 MAX9021/MAX9022/MAX9024 Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators 10s/div _______________________________________________________________________________________ 2s/div Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators PIN NAME FUNCTION MAX9021 MAX9022 MAX9024 1 -- -- IN+ Comparator Noninverting Input 2 4 11 VSS Negative Supply Voltage 3 -- -- IN- Comparator Inverting Input 4 -- -- OUT Comparator Output 5 8 4 VDD Positive Supply Voltage. Bypass with a 0.1F capacitor to GND. -- 1 1 OUTA -- 2 2 INA- Comparator A Inverting Input -- 3 3 INA+ Comparator A Noninverting Input -- 5 5 INB+ Comparator B Noninverting Input -- 6 6 INB- Comparator B Inverting Input -- 7 7 OUTB Comparator B Output -- -- 8 OUTC Comparator C Output -- -- 9 INC- Comparator C Inverting Input -- -- 10 INC+ Comparator C Noninverting Input -- -- 12 IND+ Comparator D Noninverting Input -- -- 13 IND- Comparator D Inverting Input -- -- 14 OUTD Comparator A Output Comparator D Output 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. 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- 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. _______________________________________________________________________________________ 5 MAX9021/MAX9022/MAX9024 Pin Description MAX9021/MAX9022/MAX9024 Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators R1 R2 VREF VDD VDD VDD VDD VIN IN+ OUT VIN OUT 10k IN- MAX9021 VSS Figure 1. Additional Hysteresis 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 0.1F INVSS MAX9021 Figure 2. Time Averaging of the Input Signal for Data Recovery 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 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. 6 IN+ 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: fCAR >> 1 / (2R1C1) where fCAR is the fundamental carrier frequency of the digital data stream. _______________________________________________________________________________________ Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators MAX9021 TRANSISTOR COUNT: 106 MAX9022 TRANSISTOR COUNT: 212 MAX9024 TRANSISTOR COUNT: 424 VDD VIN 0.1F R1 Chip Information VDD IN+ VREF OUT INRL R2 MAX9021 Package Information SC70, 5L.EPS (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.) PACKAGE OUTLINE, 5L SC70 21-0076 D 1 1 _______________________________________________________________________________________ 7 MAX9021/MAX9022/MAX9024 Typical Application Circuit Package Information (continued) SOT-23 5L .EPS (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.) SOT23, 8L .EPS MAX9021/MAX9022/MAX9024 Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators Revision History Pages changed at Rev 2: 1, 2, 6, 7, 8 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) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.