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LM258 データシート(PDF) 6 Page - ON Semiconductor

部品番号 LM258
部品情報  Single Supply Dual Operational Amplifiers
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM258 データシート(HTML) 6 Page - ON Semiconductor

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LM258, LM358, LM358A, LM2904, LM2904A, LM2904V, NCV2904
http://onsemi.com
6
CIRCUIT DESCRIPTION
The LM358 series is made using two internally
compensated, two−stage operational amplifiers. The first
stage of each consists of differential input devices Q20 and
Q18 with input buffer transistors Q21 and Q17 and the
differential to single ended converter Q3 and Q4. The first
stage performs not only the first stage gain function but also
performs the level shifting and transconductance reduction
functions. By reducing the transconductance, a smaller
compensation capacitor (only 5.0 pF) can be employed, thus
saving chip area. The transconductance reduction is
accomplished by splitting the collectors of Q20 and Q18.
Another feature of this input stage is that the input common
mode range can include the negative supply or ground, in
single supply operation, without saturating either the input
devices or the differential to single−ended converter. The
second stage consists of a standard current source load
amplifier stage.
Each amplifier is biased from an internal−voltage
regulator which has a low temperature coefficient thus
giving each amplifier good temperature characteristics as
well as excellent power supply rejection.
Figure 3. Large Signal Voltage
Follower Response
5.0
ms/DIV
VCC = 15 Vdc
RL = 2.0 kW
TA = 25°C
Figure 4. Input Voltage Range
Figure 5. Large−Signal Open Loop Voltage Gain
18
16
14
12
10
8.0
6.0
4.0
2.0
0
20
0
2.0
4.0
6.0
8.0
10
12
14
16
18
20
VCC/VEE, POWER SUPPLY VOLTAGES (V)
120
100
80
60
40
20
0
−20
1.0
10
100
1.0 k
10 k
100 k
1.0 M
f, FREQUENCY (Hz)
Negative
Positive
VCC = 15 V
VEE = Gnd
TA = 25°C


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