LM358, LM258, LM2904, LM2904V
Single Supply
3.0 V to VCC(max)
VCC
1
2
VEE
VCC
1
2
1.5 V to VEE(max)
VEE/Gnd
1.5 V to VCC(max)
Split Supplies
Representative Schematic Diagram
(One–Half of Circuit Shown)
Output
Q15
Q16
Q14
Q13
Q19
5.0 pF
Q12
25
Q23
40 k
Q22
Bias Circuitry
Common to Both
Amplifiers
VCC
Q24
Q18
Inputs
Q20
Q11
Q9
Q17
Q2
Q3
Q4
Q21
Q6
Q5
Q8
Q26
Q10
2.0 k
VEE/Gnd
Q7
Q1
Q25
2.4 k
CIRCUIT DESCRIPTION
The LM258 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.
MOTOROLA ANALOG IC DEVICE DATA
Large Signal Voltage
Follower Response
VCC = 15 Vdc
RL = 2.0 kΩ
TA = 25°C
1.0 V/DIV
5.0
µs/DIV
3
MOTOROLA [ MOTOROLA, INC ]
