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LM2903QDRQ1 数据表(PDF) 7 Page - Texas Instruments |
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LM2903QDRQ1 数据表(HTML) 7 Page - Texas Instruments |
7 / 18 page + ½ LM2903 VLOGIC VSUP Vref Vin + ½ LM2903 Vin- Vin+ Rpullup Rpullup VLOGIC VSUP CL CL LM2903-Q1 www.ti.com SLCS141E – MAY 2003 – REVISED JULY 2014 9 Application and Implementation 9.1 Application Information LM2903Q1 will typically be 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 LM2903Q1 optimal for level shifting to a higher or lower voltage. 9.2 Typical Application Figure 5. 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 LM2903-Q1 in a general comparator application, determine the following: • Input Voltage Range • Minimum Overdrive Voltage • Output & 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–2.0V. This limits the input voltage range to as high as VCC–2.0V and as low as 0 V. Operation outside of this range can yield incorrect comparisons. Below is a list of input voltage situation and their outcomes: 1. When both IN- & IN+ are both within the common mode range: (a) If IN- is higher than IN+ and the offset voltage, the output is low and the output transistor is sinking current (b) If IN- is lower than IN+ and the offset voltage, the output is high impedance and the output transistor is not conducting Copyright © 2003–2014, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM2903-Q1 |
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