LM358, LM258, LM2904, LM2904V

3

MOTOROLA ANALOG IC DEVICE DATA

Single Supply

Split Supplies

VCC

VEE/Gnd

3.0 V to VCC(max)

1

2

VCC

1

2

VEE

1.5 V to VCC(max)

1.5 V to VEE(max)

Representative Schematic Diagram

(One–Half of Circuit Shown)

Output

Bias Circuitry

Common to Both

Amplifiers

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

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.

Large Signal Voltage

Follower Response

5.0

µs/DIV

VCC = 15 Vdc

RL = 2.0 kΩ

TA = 25°C