Datasheet LM258, LM358, LM358A, LM358E, LM2904, LM2904A, LM2904E, LM2904V, NCV2904 (ON Semiconductor) - 6

LM258, LM358, LM358A, LM358E, LM2904, LM2904A, LM2904E, LM2904V, NCV2904 CIRCUIT DESCRIPTION
The LM358 series is made using two internally VCC = 15 Vdc compensated, two−stage operational amplifiers. The first RL = 2.0 k stage of each consists of differential input devices Q20 and TA = 25°C 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 1.0 V/DIV 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 5.0 s/DIV mode range can include the negative supply or ground, in single supply operation, without saturating either the input
Figure 3. Large Signal Voltage
devices or the differential to single−ended converter. The
Follower Response
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. 20 120 18 VCC = 15 V 100 V 16 EE = Gnd TA = 25°C 14 80 TAGE (V) TAGE GAIN (dB) 12 60 VOL VOL 10 Negative 8.0 40 Positive IV , INPUT 6.0 20 4.0 , OPEN LOOP 0 2.0 VOLA 0 -20 0 2.0 4.0 6.0 8.0 10 12 14 16 18 20 1.0 10 100 1.0 k 10 k 100 k 1.0 M VCC/VEE, POWER SUPPLY VOLTAGES (V) f, FREQUENCY (Hz)
Figure 4. Input Voltage Range Figure 5. Large−Signal Open Loop Voltage Gain www.onsemi.com 6