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LM2903 Datasheet(PDF) 7 Page - 3PEAK INC.

Part No. LM2903
Description  36V Low Power Dual/Quad Differential Comparators
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Maker  3PEAK [3PEAK INC.]
Homepage  http://www.3peakic.com/
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LM2903 Datasheet(HTML) 7 Page - 3PEAK INC.

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7
LM2903/LM2901
36V Low Power Dual/Quad Differential Comparators
www.3peakic.com.cn
Rev. B
DD
V
R2
1
r
V
R2
2
1
tf
V
R
R
R
DD
V
R2
1
tf
V
tr
V
hy st
V
R
Inverting Comparator with Hysteresis
The inverting comparator with hysteresis requires a three-resistor network that is referenced to the comparator
supply voltage (VDD), as shown in Figure 4.
Vi
Vo
R3
R2
VDD
R1
Vtr
Vo
R3
R2
VDD
R1
V+=Vtr
Vtf
Vo
R3
R2
VDD
R1
V+=Vtf
VDD
LM393
LM393
LM393
Figure 4. Inverting Configuration with Hysteresis
When Vi is greater than V+, the output voltage is low. In this case, the three network resistors can be presented as
paralleled resistor R2 || R3 in series with R1. When Vi at the inverting input is less than V+, the output voltage is
high. The three network resistors can be represented as R1 ||R3 in series with R2.
DD
V
2
3
||
1
2
tr
V
R
R
R
R
DD
V
1
3
||
2
3
||
2
tf
V
R
R
R
R
R
DD
V
3
2
||
1
2
||
1
tf
V
tr
V
hy st
V
R
R
R
R
R
Low Input Bias Current
The LM2903/2901 family is a CMOS comparator family and features very low input bias current in pA range. The
low input bias current allows the comparators to be used in applications with high resistance sources. Care must
be taken to minimize PCB Surface Leakage. See below section on “PCB Surface Leakage” for more details.
PCB Surface Leakage
In applications where low input bias current is critical, Printed Circuit Board (PCB) surface leakage effects need to
be considered. Surface leakage is caused by humidity, dust or other contamination on the board. Under low
humidity conditions, a typical resistance between nearby traces is 1012
Ω. A 5V difference would cause 5pA of


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