LM2902D Просмотр технического описания (PDF) - Motorola => Freescale

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LM2902D

QUAD DIFFERENTIAL INPUT OPERATIONAL AMPLIFIERS

Motorola => Freescale 

LM324, LM324A, LM224, LM2902, LM2902V

CIRCUIT DESCRIPTION

The LM324 series is made using four 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.

Large Signal Voltage Follower Response

VCC = 15 Vdc

RL = 2.0 kΩ

TA = 25°C

5.0 µs/DIV

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.

Single Supply

3.0 V to VCC(max)

VCC

1

2

3

4

VEE/Gnd

VCC

1

2

3

4

VEE

Split Supplies

1.5 V to VCC(max)

1.5 V to VEE(max)

4

MOTOROLA ANALOG IC DEVICE DATA

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