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LM2901AVQPWRQ1 Datasheet(PDF) 9 Page - Texas Instruments

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Part # LM2901AVQPWRQ1
Description  LM2901x-Q1 Quadruple Differential Comparator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2901AVQPWRQ1 Datasheet(HTML) 9 Page - Texas Instruments

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±1
0
1
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0.5
1.0
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5mV OD
20mV OD
100mV OD
C001
±1
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1.5
2.0
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Time (us)
5mV OD
20mV OD
100mV OD
C001
9
LM2901-Q1, LM2901V-Q1, LM2901AV-Q1
www.ti.com
SLCS142E – DECEMBER 2003 – REVISED MAY 2016
Product Folder Links: LM2901-Q1 LM2901V-Q1 LM2901AV-Q1
Submit Documentation Feedback
Copyright © 2003–2016, Texas Instruments Incorporated
If IN– is lower than IN+ and the offset voltage, then the output is in high impedance and the output
transistor is not conducting.
When IN– is higher than common-mode and IN+ is within common-mode, the output is low and the output
transistor is sinking current.
When IN+ is higher than common-mode and IN– is within common-mode, then the output is in high
impedance and the output transistor is not conducting.
When IN– and IN+ are both higher than common-mode, then the output is low and the output transistor is
sinking current.
8.2.2.2 Minimum Overdrive Voltage
The overdrive voltage is the differential voltage produced between the positive and negative inputs of the
comparator over the offset voltage (VIO). To make an accurate comparison the overdrive voltage (VOD) must be
higher than the input offset voltage (VIO). The overdrive voltage can also determine the response time of the
comparator, with the response time decreasing as the overdrive increases. Figure 5 and Figure 6 show positive
and negative response times with respect to overdrive voltage.
8.2.2.3 Output and Drive Current
Output current is determined by the load or pullup resistance and logic or pullup voltage. The output current
produces an output low voltage (VOL) from the comparator. In which VOL is proportional to the output current. Use
Figure 3 to determine VOL based on the output current.
The output current can also effect the transient response. See Response Time for more information.
8.2.2.4 Response Time
The transient response can be determined by the load capacitance (CL), load or pullup resistance (RPULLUP), and
equivalent collector-emitter resistance (RCE).
Use Equation 1 and Equation 2 to calculate the approximate values of the rise time (tr) and fall time (tf).
tP ≈ RPULLUP × CL
(1)
tN ≈ RCE × CL
(2)
To find the value of RCE, use the slope of Figure 3 in the linear region at the desired temperature, or divide VOL
by IO.
8.2.3 Application Curves
The following curves were generated with 5 V on VCC and VLOGIC, RPULLUP = 5.1 kΩ, and 50-pF scope probe.
Figure 5. Response Time for Various Overdrives
Negative Transition
Figure 6. Response Time for Various Overdrives
Positive Transition


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