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LM321SN3T1G Datenblatt(PDF) 8 Page - ON Semiconductor

Teilenummer LM321SN3T1G
Bauteilbeschribung  Single Channel Operational Amplifier
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Hersteller  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM321SN3T1G Datenblatt(HTML) 8 Page - ON Semiconductor

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LM321
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APPLICATION INFORMATION
CIRCUIT DESCRIPTION
The LM321 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.
Output
Bias Circuitry
VCC
VEE/Gnd
Inputs
Q2
Q3
Q4
Q5
Q26
Q7
Q8
Q6
Q9
Q11
Q10
Q1
2.4 k
Q25
Q22
40 k
Q13
Q14
Q15
Q16
Q19
5.0 pF
Q18
Q17
Q20
Q21
2.0 k
Q24
Q23
Q12
25
Figure 19. LM321 Representative Schematic Diagram


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