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LM139 Datasheet(PDF) 23 Page - Texas Instruments |
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LM139 Datasheet(HTML) 23 Page - Texas Instruments |
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23 / 48 page  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, as well as validating and testing their design implementation to confirm system functionality. 9.1 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 LMx39 or LM2901x optimal for level shifting to a higher or lower voltage. 9.2 Typical Application + LM2901 VLOGIC VSUP Vref Vin + LM2901 Vin- Vin+ Rpullup Rpullup VLOGIC VSUP C L C L Figure 9-1. Single-ended and Differential Comparator Configurations 9.2.1 Design Requirements For this design example, use the parameters listed in Table 9-1 as the input parameters. Table 9-1. 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 9.2.2 Detailed Design Procedure When using the 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. www.ti.com LM139, LM239, LM339, LM339B, LM139A, LM239A LM339A, LM2901B, LM2901, LM2901AV, LM2901V SLCS006V – OCTOBER 1979 – REVISED DECEMBER 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 23 Product Folder Links: LM139 LM239 LM339 LM339B LM139A LM239A LM339A LM2901B LM2901 LM2901AV LM2901V |
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Similar Description - LM139_V01 |
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