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| Preliminary Technical Data FEATURES Dual Comparators with 400mV Reference and programmable Hysteresis ADCMP341/ADCMP343 FUNCTIONAL BLOCK DIAGRAM VINA VS Low Quiescent Current: 6.5A Typ Supply Range: 1.7V to 5.5V 400mV Reference 0.8% Accuracy Over Temperature Input Range Includes Ground User programmable Hysteresis via resistor string Low Input Bias Current: 10nA Max Open drain outputs with 40mA Typical Sink Current Supports Wired-AND Connections Input Polarities: ADCMP341 noninverting ADCMP343 inverting Small SOT-23 Package ADCMP341 INA_U MUX 400mV VINB OUTA INA_L APPLICATIONS Battery-Powered System Monitoring Threshold Detectors Relay Driving Optoisolator Driving Handheld Instruments VINA INB_U MUX GND VS OUTB INB_L GENERAL DESCRIPTION The ADCMP341/ADCMP343 combine two low power, low voltage comparators with a 400mV reference in the 5-lead SOT-23 package. Operating within a supply range of 1.7V to 5.5V, the devices only draw 6.5A typical, making them ideal for low voltage system monitoring and portable applications. Hysteresis is determined using three resistors in a string configuration with the upper and lower tap points connected to the INA_U and INA_L pins of each comparator respectively. The state of the comparators output internally selects which pin is connected to the comparator inputs. So a change of state in the comparator output will result in one of the inputs being switched in to the comparator and the other being switched out. This will provide the user with a fully flexible and simple method of setting the hysteresis. Although there are two pins available on each comparator, there is only actually one input available externally at any one time, the other inputs are connected internally to the reference. The comparator outputs are open drain with the output stage sinking capability guaranteed greater than 5mA over temperature. The ADCMP341 have noninverting inputs and the ADCMP343 have inverting inputs. Available in commercial, industrial and automotive temperature ranges. Rev. PrD 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. ADCMP343 INA_U MUX 400mV VINB MUX GND OUTA INA_L INB_U OUTB INB_L Figure 1 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)2006 Analog Devices, Inc. All rights reserved. ADCMP341/ADCMP343 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ............................................. 6 Preliminary Technical Data Applications INFORMATION ..................................................... 11 Comparators and Internal reference........................................ 11 programming Hysteresis ........................................................... 11 Outline Dimensions ....................................................................... 12 Ordering Guide .......................................................................... 12 REVISION HISTORY Rev. PrD | Page 2 of 13 Preliminary Technical Data SPECIFICATIONS Table 1. VCC = 1.7V to 5.5V, -40C TA 125C , unless otherwise noted. Parameter Reference Voltage Reference Voltage Accuracy Input Bias Current Output Low Voltage Output Leakage Current High-to-Low Propagation Delay Low-to-High Propagation Delay Output Rise time Output Fall time Supply Current Min 396.8 396.8 Typ 400 400 0.8 0.8 0.01 4 60 70 0.01 0.01 29 18 2.2 0.22 6.5 6.5 10 10 Max 403.2 403.2 1.0 1.0 10 10 200 200 1 1 Unit mV mV % % nA nA mV mV A A s s s s A A ADCMP341/ADCMP343 Test Conditions/Comments Vs = 1.7V, Note1 Vs = 5V, Note1 Vs = 1.7V, Note1 Vs = 5V, Note1 Vs = 1.7V, Vin = Vs Vs = 1.7V, Vin = 0.1V Vs = 1.7V, Iout = 3mA, Note2 Vs = 5V, Iout = 5mA, Note2 Vs=1.7V, Vout = Vs, Note3 Vs=1.7V, Vout = 5.5V, Note3 Vs = 5V, Vol = 400mV, Note2,4 Vs = 5V, Voh = 0.9 X Vs, Note2,4 Vs = 5V, Vo = (0.1 to 0.9) X Vs, Note2,4 Vs = 5V, Vo = (0.1 to 0.9) X Vs, Note2,4 Vs = 1.7V Vs = 5.5V Note1: RL=100K, VO=2V Swing Note2: 10mV input overdrive Note3: Vin = 40mV overdrive Note4: RL=10K Note5: No load Rev. PrD | Page 3 of 13 ADCMP341/ADCMP343 ABSOLUTE MAXIMUM RATINGS TA = 25C, unless otherwise noted. Table 2. . Parameter Vs INx OUTx Operating Temperature Range Storage Temperature Range JA Thermal Impedance, SC70 Lead Temperature Soldering (10 sec) Vapor Phase (60 sec) Infrared (15 sec) Rating -0.3V to +6V -0.3V to +6V -0.3V to +6V -40C to +125C -65C to +150C 146C/W 300C 215C 220C Preliminary Technical Data 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. 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. PrD | Page 4 of 13 Preliminary Technical Data PIN CONFIGURATION AND FUNCTION DESCRIPTIONS OUTA 1 +INA_U 2 ADCMP341 +INA_L 3 GND 4 8 7 OUTB Vs OUTA 1 ADCMP341/ADCMP343 8 7 OUTB Vs -INA_U 2 ADCMP343 -INA_L 3 GND 4 6 +INB_U 5 +INB_L 6 -INB_U 5 -INB_L Figure 2. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1 2 Mnemonic OUTA INA_U Description Open Drain Output for comparator A. Capable of sinking up to 40mA of current. Monitors Analog Input Voltage on comparator A. Connect to the upper tap point of the resistor string. Connected internally to the noninverting input on the ADCMP341 or the inverting pin on the ADCMP343 via mux controlled by output level on comparator A. The other input of comparator A is connected to a 400mV reference. Monitors Analog Input Voltage on comparator A. Connect to the lower tap point of the resistor string. Connected internally to the noninverting input on the ADCMP341 or the inverting pin on the ADCMP343 via mux controlled by output level on comparator A. The other input of comparator A is connected to a 400mV reference. Ground Monitors Analog Input Voltage on comparator B. Connect to the lower tap point of the resistor string. Connected internally to the noninverting input on the ADCMP341 or the inverting pin on the ADCMP343 via mux controlled by output level on comparator B. The other input of comparator B is connected to a 400mV reference. Monitors Analog Input Voltage on comparator B. Connect to the upper tap point of the resistor string. Connected internally to the noninverting input on the ADCMP341 or the inverting pin on the ADCMP343 via mux controlled by output level on comparator B. The other input of comparator B is connected to a 400mV reference. Power Supply. Operates from 1.7V to 5.5V. Open Drain Output for comparator B. Capable of sinking up to 40mA of current. 3 INA_L 4 5 GND INB_L 6 INB_U 7 8 Vs OUTB Rev. PrD | Page 5 of 13 ADCMP341/ADCMP343 TYPICAL PERFORMANCE CHARACTERISTICS Preliminary Technical Data Figure 3. Distribution of Rising Input Threshold Voltage Figure 6. Distribution of Falling Input Threshold Voltage Figure 4. ??? Figure 7. Rising Input Threshold Voltage vs Temperature Figure 5.Rising Input Threshold Voltage vs Temperature Figure 8.Rising Input Threshold Voltage vs Supply Voltage Rev. PrD | Page 6 of 13 Preliminary Technical Data ADCMP341/ADCMP343 Figure 9. ???e Figure 12. ??? Figure 10. ??? Figure 13. Minimum Supply Voltage Figure 11. Quiescent Supply Current vs Supply Voltage Figure 14. Startup Supply Current Rev. PrD | Page 7 of 13 ADCMP341/ADCMP343 Preliminary Technical Data Figure 15. Supply Current vs Output Sink Current Figure 18. Below Ground Input Bias Current Figure 16 Supply Current vs Output Sink Current Figure 19. Low Level Input Bias Current Figure 17. Supply Current vs Output Sink Current Figure 20 High Level Input Bias Current Rev. PrD | Page 8 of 13 Preliminary Technical Data ADCMP341/ADCMP343 Figure 21. Output Saturation Voltage vs Output Sink Current Figure 24. Output Short Circuit Current Figure 22 Output Saturation Voltage vs Output Sink Current Figure 25. Output Short Circuit Current Figure 23. Output Saturation Voltage vs Output Sink Current Figure 26. Output Leakage current Rev. PrD | Page 9 of 13 ADCMP341/ADCMP343 Preliminary Technical Data Figure 27. Propagation Delay vs Input Overdrive Figure 28.Non Inverting and Inverting comparators Propagation Delay Figure 29. Rise and Fall Times vs Output Pullup Resistor Rev. PrD | Page 10 of 13 Preliminary Technical Data APPLICATIONS INFORMATION The ADCMP341/3 is a dual low power comparators with a built in 400mV reference that operates from 1.7V to 5.5V. The comparators are approx 0.8% accurate with fully programmable accurate hysteresis implementing a new technique of a three resistor string on the input. The outputs are open drain capable of sinking up to 40mA. ADCMP341/ADCMP343 Now calculate the three resistor values as follows: R1 = R3 = RTOT x (VFALLING - 0.4) VFALLING RTOT x 0.4 ; VRISING COMPARATORS AND INTERNAL REFERENCE Each of the comparators has one input available externally, the other comparator inputs are connected internally to the 400mV reference. The ADCMP341 has two noninverting comparators and the ADCMP343 has two inverting comparators. There are two input pins available to each comparator. However, these two input pins(INx_U, INx_U) connect to the same input leg of the comparator via a muxing system. This is to provide fully programmable rising and falling trip points. The output of the said comparator determines which pin is connected to the input of the same comparator. Taking Figure 30. as an example, when OUTA is high INA_U is connected to the comparator input. When the input voltage drops and passes below the 400mV reference the output goes low. This in turn disconnects INA_U from the comparator and connects INA_L. This leg of the string will be at a lower voltage and thus instantaneously the effect of hysteresis is applied. Therefore, using a resistor string on the input as shown in Figure 30., the voltages for the rising and falling trip points can be programmed by selecting the appropriate resistors in the string. R2 = RTOT - R1 - R3 ; Where: R1, R2 and R3 are the three resistors as shown in Figure 30. RTOT is the sum of R1, R2 and R3. VFALLING is the desired falling trip voltage and lower of the two. VRISING is the desired rising trip voltage and higher of the two. VHYST is therefore = VRISING -VFALLING VINA V CC ADCMP341 R1 INA_U MUX R2 OUTA PROGRAMMING HYSTERESIS The resistor values can be calculated as follows. The total resistance of the string is first determined based on the power budget available. Using the maximum voltage expected on the pin and the maximum acceptable current available to flow through the string1, the total resistance of the string is calculated as follows: R3 INA_L 400mV RTOT = 1 VINMAX I MAX Figure 30. Assuming the leakage current into the comparator to be negligible Rev. PrD | Page 11 of 13 ADCMP341/ADCMP343 OUTLINE DIMENSIONS 2.90 BSC Preliminary Technical Data 8 7 6 5 1.60 BSC 1 2 3 4 2.80 BSC PIN 1 INDICATOR 0.65 BSC 1.30 1.15 0.90 1.95 BSC 1.45 MAX 0.38 0.22 0.22 0.08 8 4 0 0.15 MAX SEATING PLANE 0.60 0.45 0.30 COMPLIANT TO JEDEC STANDARDS MO-178-BA Figure 31. . 8-Lead SOT-23 Package (RJ-8)--Dimensions shown in millimeters ORDERING GUIDE Table 4. Model ADCMP341ARJ ADCMP343ARJ Temperature Range -40C to +125C -40C to +125C Package Description SOT-23, 8 lead SOT-23, 8 lead Branding Package Outline RJ-8 RJ-8 Rev. PrD | Page 12 of 13 Preliminary Technical Data NOTES ADCMP341/ADCMP343 (c)2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR06154-0-6/06(PrD) Rev. PrD | Page 13 of 13 |
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