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LM139A-MIL Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce LM139A-MIL
Description  Quad Differential Comparators
Download  19 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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LM139A-MIL Fiches technique(HTML) 8 Page - Texas Instruments

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TI Device
VLOGIC
VSUP
Vref
Vin
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TI Device
Vin-
Vin+
Rpullup
Rpullup
VLOGIC
VSUP
C
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8
LM139A-MIL
SLCS161 – JUNE 2017
www.ti.com
Product Folder Links: LM139A-MIL
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Copyright © 2017, Texas Instruments Incorporated
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Validate and test
the design implementation to confirm system functionality.
8.1 Application Information
Typically, a comparator compares either a single signal to a reference, or to two differnt signals. Many users take
advantage of the open-drain output to drive the comparison logic output to a logic voltage level to an MCU or
logic device. The wide supply range and high voltage capability makes LM139A-MIL optimal for level shifting to a
higher or lower voltage.
8.2 Typical Application
Figure 7. Single-ended and Differential Comparator Configurations
8.2.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 1. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Input Voltage Range
0 V to Vsup-1.5 V
Supply Voltage
4.5 V to VCC maximum
Logic Supply Voltage
0 V to VCC maximum
Output Current (RPULLUP)
1 µA to 4 mA
Input Overdrive Voltage
100 mV
Reference Voltage
2.5 V
Load Capacitance (CL)
15 pF
8.2.2 Detailed Design Procedure
When using the LM139A-MIL in a general comparator application, determine the following:
Input voltage range
Minimum overdrive voltage
Output and drive current
Response time
8.2.2.1 Input Voltage Range
When choosing the input voltage range, the input common-mode voltage range (VICR) must be taken in to
account. If temperature operation is above or below 25°C the VICR can range from 0 V to VCC– 2 V. This limits
the input voltage range to as high as VCC– 2 V and as low as 0 V. Operation outside of this range can yield
incorrect comparisons.


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