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LM2903AVQDRQ1 Scheda tecnica(PDF) 8 Page - Texas Instruments

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Il numero della parte LM2903AVQDRQ1
Spiegazioni elettronici  LM2903-Q1 Dual Differential Comparators
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM2903AVQDRQ1 Scheda tecnica(HTML) 8 Page - Texas Instruments

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±1
0
1
2
3
4
5
6
-0.25
0.25
0.75
1.25
1.75
2.25
Time (usec)
5mV OD
20mV OD
100mV OD
C004
±1
0
1
2
3
4
5
6
±0.25 0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
Time (usec)
5mV OD
20mV OD
100mV OD
C006
LM2903-Q1
SLCS141E – MAY 2003 – REVISED JULY 2014
www.ti.com
2. When IN- is higher than common mode and IN+ is within common mode, the output is low and the output
transistor is sinking current
3. When IN+ is higher than common mode and IN- is within common mode, the output is high impedance and
the output transistor is not conducting
4. When IN- and IN+ are both higher than common mode, the output is low and the output transistor is sinking
current
9.2.2.2 Minimum Overdrive Voltage
Overdrive Voltage is the differential voltage produced between the positive and negative inputs of the comparator
over the offset voltage (VIO). In order to make an accurate comparison the Overdrive Voltage (VOD) should be
higher than the input offset voltage (VIO). Overdrive voltage can also determine the response time of the
comparator, with the response time decreasing with increasing overdrive. Figure 6 & Figure 7 show positive and
negative response times with respect to overdrive voltage.
9.2.2.3 Output & Drive Current
Output current is determined by the load/pull-up resistance and logic/pull-up voltage. The output current will
produce a 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. More will be explained in the next section.
9.2.2.4 Response Time
The transient response can be determined by the load capacitance (CL), load/pull-up resistance (RPULLUP) and
equivalent collector-emitter resistance (RCE).
The positive response time (
τp) is approximately τP ~ RPULLUP x CL
The negative response time (
τN) is approximately τN ~ RCE x CL
RCE can be determine by taking the slope of Figure 3 in it's linear region at the desired temperature, or by
dividing the VOL by Iout
9.2.3 Application Curves
The following curves were generated with 5 V on VCC & VLogic, RPULLUP = 5.1 kΩ, and 50 pF scope probe.
Figure 6. Response Time for Various Overdrives (Positive
Figure 7. Response Time for Various Overdrives (Negative
Transition)
Transition)
8
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