Datenblatt-Suchmaschine für elektronische Bauteile |
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LM321SN3T1G Datenblatt(PDF) 8 Page - ON Semiconductor |
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LM321SN3T1G Datenblatt(HTML) 8 Page - ON Semiconductor |
8 / 10 page LM321 www.onsemi.com 8 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 |
Ähnliche Teilenummer - LM321SN3T1G |
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Ähnliche Beschreibung - LM321SN3T1G |
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