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LM397MFX Fiches technique(PDF) 7 Page - Texas Instruments

No de pièce LM397MFX
Description  Single General-Purpose Voltage Comparator
Download  19 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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LM397MFX Fiches technique(HTML) 7 Page - Texas Instruments

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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
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