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LM2903N Datasheet(PDF) 18 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) 18 Page - Texas Instruments

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LM193-N, LM2903-N, LM293-N, LM393-N
SNOSBJ6F – OCTOBER 1999 – REVISED DECEMBER 2014
www.ti.com
10 Power Supply Recommendations
Even in low frequency applications, the LM139-N can have internal transients which are extremely quick. For this
reason, bypassing the power supply with 1.0
μF to ground will provide improved performance; the supply bypass
capacitor should be placed as close as possible to the supply pin and have a solid connection to ground. The
bypass capacitor should have a low ESR and also a SRF greater than 50MHz.
11 Layout
11.1 Layout Guidelines
Try to minimize parasitic impedances on the inputs to avoid oscillation. Any positive feedback used as hysteresis
should place the feedback components as close as possible to the input pins. Care should be taken to ensure
that the output pins do not couple to the inputs. This can occur through capacitive coupling if the traces are too
close and lead to oscillations on the output. The optimum placement for the bypass capacitor is closest to the V+
and ground pins. Take care to minimize the loop area formed by the bypass capacitor connection between V+
and ground. The ground pin should be connected to the PCB ground plane at the pin of the device. The
feedback components should be placed as close to the device as possible minimizing strays.
11.2 Layout Example
Figure 38. Layout Example
18
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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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