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LM139AD bảng dữ liệu(PDF) 11 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Quad Differential Comparators
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LM139AD bảng dữ liệu(HTML) 11 Page - Texas Instruments

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background image
+
LM2901
VLOGIC
VSUP
Vref
Vin
+
LM2901
Vin-
Vin+
Rpullup
Rpullup
VLOGIC
VSUP
CL
CL
LM139, LM239, LM339, LM139A
LM239A, LM339A, LM2901, LM2901AV, LM2901V
www.ti.com
SLCS006T – OCTOBER 1979 – REVISED JUNE 2015
9 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.
9.1 Application Information
Typically, the LMx39 compares either a single signal to a reference or two 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 LMx39 optimal for level shifting to a higher or lower voltage.
9.2 Typical Application
Figure 7. Single-ended and Differential Comparator Configurations
9.2.1 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
2 V to 36 V
Logic Supply Voltage
2 V to 36 V
Output Current (RPULLUP)
1 µA to 20 mA
Input Overdrive Voltage
100 mV
Reference Voltage
2.5 V
Load Capacitance (CL)
15 pF
9.2.2 Detailed Design Procedure
When using LMx39 in a general comparator application, determine the following:
Input voltage range
Minimum overdrive voltage
Output and drive current
Response time
9.2.2.1 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.
Copyright © 1979–2015, Texas Instruments Incorporated
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Product Folder Links: LM139 LM239 LM339 LM139A LM239A LM339A LM2901 LM2901AV LM2901V


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