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LMV321M7/NOPB bảng dữ liệu(PDF) 28 Page - Texas Instruments |
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LMV321M7/NOPB bảng dữ liệu(HTML) 28 Page - Texas Instruments |
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28 / 44 page ![]() LMV321-N, LMV321-N-Q1, LMV358-N, LMV358-N-Q1 LMV324-N, LMV324-N-Q1 SNOS012I – AUGUST 2000 – REVISED FEBRUARY 2013 www.ti.com COMPARATOR WITH HYSTERESIS The LMV321-N/LMV358-N/LMV324-N can be used as a low power comparator. Figure 72 shows a comparator with hysteresis. The hysteresis is determined by the ratio of the two resistors. VTH+ = VREF/(1+R 1/R2)+VOH/(1+R2/R1) (30) VTH− = VREF/(1+R 1/R2)+VOL/(1+R2/R1) (31) VH = (VOH−VOL)/(1+R 2/R1) (32) where VTH+: Positive Threshold Voltage VTH−: Negative Threshold Voltage VOH: Output Voltage at High VOL: Output Voltage at Low VH: Hysteresis Voltage Since LMV321-N/LMV358-N/LMV324-N have rail-to-rail output, the (VOH−VOL) is equal to VS, which is the supply voltage. VH = VS/(1+R2/R1) (33) The differential voltage at the input of the op amp should not exceed the specified absolute maximum ratings. For real comparators that are much faster, we recommend you use Texas Instruments's LMV331/LMV93/LMV339, which are single, dual and quad general purpose comparators for low voltage operation. Figure 72. Comparator with Hysteresis 28 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LMV321-N LMV321-N-Q1 LMV358-N LMV358-N-Q1 LMV324-N LMV324-N-Q1 |
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