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LM2901VQPWRQ1 Datasheet(PDF) 8 Page - Texas Instruments |
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LM2901VQPWRQ1 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 20 page V SUP V xIN+ V REF + C L R PULLUP V LOGIC – ½ LM2901x-Q1 V xIN+ V xIN– C L R PULLUP – ½ LM2901x-Q1 V SUP V LOGIC Copyright © 2016, Texas Instruments Incorporated 8 LM2901-Q1, LM2901V-Q1, LM2901AV-Q1 SLCS142E – DECEMBER 2003 – REVISED MAY 2016 www.ti.com Product Folder Links: LM2901-Q1 LM2901V-Q1 LM2901AV-Q1 Submit Documentation Feedback Copyright © 2003–2016, 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. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information The LM2901x-Q1 family of devices is typically used to compare a single signal to a reference or two signals against each other. 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 the LM2901x-Q1 family of devices optimal for level shifting to a higher or lower voltage. 8.2 Typical Application Figure 4. 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 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 8.2.2 Detailed Design Procedure 8.2.2.1 Input Voltage Range When selecting the input voltage range, the input common-mode voltage range (VICR) must be considered. If temperature operation is above or below 25°C the VICR can range from 0 V to VCC – 2 V. The VICR range 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. The following lists some input voltage scenarios and the resulting outcomes: • When both IN– and IN+ are both within the common-mode range: – If IN– is higher than IN+ and the offset voltage, then the output is low and the output transistor is sinking current. |
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