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LM2901AVQDRG4Q1 Datasheet(PDF) 9 Page - Texas Instruments |
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LM2901AVQDRG4Q1 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 20 page ±1 0 1 2 3 4 5 6 0.0 0.5 1.0 1.5 2.0 2.5 Time (us) 5mV OD 20mV OD 100mV OD C001 ±1 0 1 2 3 4 5 6 0.0 0.5 1.0 1.5 2.0 2.5 Time (us) 5mV OD 20mV OD 100mV OD C001 9 LM2901-Q1, LM2901V-Q1, LM2901AV-Q1 www.ti.com SLCS142E – DECEMBER 2003 – REVISED MAY 2016 Product Folder Links: LM2901-Q1 LM2901V-Q1 LM2901AV-Q1 Submit Documentation Feedback Copyright © 2003–2016, Texas Instruments Incorporated – If IN– is lower than IN+ and the offset voltage, then the output is in high impedance and the output transistor is not conducting. • When IN– is higher than common-mode and IN+ is within common-mode, the output is low and the output transistor is sinking current. • When IN+ is higher than common-mode and IN– is within common-mode, then the output is in high impedance and the output transistor is not conducting. • When IN– and IN+ are both higher than common-mode, then the output is low and the output transistor is sinking current. 8.2.2.2 Minimum Overdrive Voltage The overdrive voltage is the differential voltage produced between the positive and negative inputs of the comparator over the offset voltage (VIO). To make an accurate comparison the overdrive voltage (VOD) must be higher than the input offset voltage (VIO). The overdrive voltage can also determine the response time of the comparator, with the response time decreasing as the overdrive increases. Figure 5 and Figure 6 show positive and negative response times with respect to overdrive voltage. 8.2.2.3 Output and Drive Current Output current is determined by the load or pullup resistance and logic or pullup voltage. The output current produces an output low voltage (VOL) from the comparator. In which VOL is proportional to the output current. Use Figure 3 to determine VOL based on the output current. The output current can also effect the transient response. See Response Time for more information. 8.2.2.4 Response Time The transient response can be determined by the load capacitance (CL), load or pullup resistance (RPULLUP), and equivalent collector-emitter resistance (RCE). Use Equation 1 and Equation 2 to calculate the approximate values of the rise time (tr) and fall time (tf). tP ≈ RPULLUP × CL (1) tN ≈ RCE × CL (2) To find the value of RCE, use the slope of Figure 3 in the linear region at the desired temperature, or divide VOL by IO. 8.2.3 Application Curves The following curves were generated with 5 V on VCC and VLOGIC, RPULLUP = 5.1 kΩ, and 50-pF scope probe. Figure 5. Response Time for Various Overdrives Negative Transition Figure 6. Response Time for Various Overdrives Positive Transition |
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