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LM2903N Datasheet(PDF) 12 Page - Texas Instruments

Part No. LM2903N
Description  Low-Power, Low-Offset Voltage, Dual Comparators
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2903N Datasheet(HTML) 12 Page - Texas Instruments

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LM193-N, LM2903-N, LM293-N, LM393-N
SNOSBJ6F – OCTOBER 1999 – REVISED DECEMBER 2014
www.ti.com
Typical Applications (continued)
9.2.1.2 Detailed Design Procedure
First, we determine the biasing for the 2.5-V reference. With the 5-V supply voltage, we would use a voltage
divider consisting of one resistor from the supply to IN- and an second resistor from IN–. The 25 nA of input
current bias should be < 1% of the bias current for Vref. With a 100-k
Ω resistor from IN– to V+ and an additional
100-K
Ω resistor from IN– to ground, there would be 25 µA of current through the two resistors. The 3-kΩ pullup
shown will need 5 V/3 k
Ω → 1.67 mA, which exceeds our current budget.
With the 400-µA supply current and 25 µA of VREF bias current, there is 575 µA remaining for output pullup
resistor; with 5-V supply, we need a pullup larger than 8.7 k
Ω. A 10-kΩ pullup is a value that is commonly
available and can be used here.
9.2.1.3 Application Curve
Figure 13. Basic Comparator Response
12
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Copyright © 1999–2014, Texas Instruments Incorporated
Product Folder Links: LM193-N LM2903-N LM293-N LM393-N


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