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LM397MFX Fiches technique(PDF) 7 Page - Texas Instruments |
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LM397MFX Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 19 page VIN+ VIN- VS GND OUTPUT VOLTS VREF VO TIME VIN VREF VIN VO - + V - RPULL-UP VS LM397 www.ti.com SNOS977E – MAY 2001 – REVISED OCTOBER 2015 7 Detailed Description 7.1 Overview A comparator is often used to convert an analog signal to a digital signal. The comparator compares an input voltage (VIN) at the noninverting pin to the reference voltage (VREF) at the inverting pin. If VIN is less than VREF the output (VO) is low (VOL). However, if VIN is greater than VREF, the output voltage (VO) is high (VOH). Refer to Figure 6. Figure 5. Basic Comparator Figure 6. Basic Comparator Output 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Input Stage The LM397 has a bipolar input stage. The input common-mode voltage range is from 0 to (VS – 1.5 V). 7.3.2 Output Stage The LM397 has an open-collector grounded-emitter NPN output transistor for the output stage. This requires an external pullup resistor connected between the positive supply voltage and the output. The external pullup resistor should be high enough resistance so to avoid excessive power dissipation. In addition, the pullup resistor should be low enough resistance to enable the comparator to switch with the load circuitry connected. Because it is an open-collector output stage, several comparator outputs can be connected together to create an OR’ing function output. With an open collector, the output can be used as a simple SPST switch to ground. The amount of current which the output can sink is approximately 10 mA. When the maximum current limit is reached, the output transistor will saturate and the output will rise rapidly (Figure 7). Copyright © 2001–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM397 |
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