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LM397MFX Datasheet(PDF) 10 Page - Texas Instruments |
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LM397MFX Datasheet(HTML) 10 Page - Texas Instruments |
10 / 19 page 200 400 800 1200 1400 2000 -100 - 50 0 50 10 0 0 2 4 6 8 10 TIME (ns) VOD = 50mV VOD = 5mV OVERDRIVE VOLTAGE (VOD) VS = 5V, RPULL-UP = 5.1k: TO VS CL = 15pF TO GND 200 400 800 1200 1400 2000 -100 - 50 0 50 10 0 0 2 4 6 8 10 TIME (ns) VOD = 50mV VOD = 5mV OVERDRIVE VOLTAGE (VOD) VS = 5V, RPULL-UP = 5.1k: TO VS CL = 15pF TO GND LM397 SNOS977E – MAY 2001 – REVISED OCTOBER 2015 www.ti.com 8.2.2.1 Input Voltage Range When choosing the input voltage range, the input common mode voltage range (VCM) must be taken in to account. If temperature operation is above or below 25°C the VCM can range from 0 V to VS – 1.5 V. This limits the input voltage range to as high as VS – 1.5 V and as low as 0 V. Operation outside of this range can yield incorrect comparisons. Below is a list of input voltage situation and their outcomes: 1. When both IN– and IN+ are both within the common mode range: (a) If IN– is higher than IN+ and the offset voltage, the output is low and the output transistor is sinking current (b) If IN– is lower than IN+ and the offset voltage, the output is high impedance and the output transistor is not conducting 2. When IN– is higher than common mode and IN+ is within common mode, the output is low and the output transistor is sinking current 3. When IN+ is higher than common mode and IN– is within common mode, the output is high impedance and the output transistor is not conducting 4. When IN– and IN+ are both higher than common mode, the output is low and the output transistor is sinking current 8.2.2.2 Minimum Overdrive Voltage Overdrive Voltage is the differential voltage produced between the positive and negative inputs of the comparator over the offset voltage. To make an accurate comparison; the overdrive voltage should be higher than the input offset voltage. Overdrive voltage can also determine the response time of the comparator, with the response time decreasing with increasing overdrive. 8.2.2.3 Output and Drive Current Output current is determined by the pullup resistance (RPULLUP) and VS voltage. The output current will produce a 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. 8.2.3 Application Curves Figure 11. Response Time for Various Input Overdrives – Figure 10. Response Time for Various Input Overdrives – tPLH tPHL 10 Submit Documentation Feedback Copyright © 2001–2015, Texas Instruments Incorporated Product Folder Links: LM397 |
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