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LT1490A
(Rev.:RevB)

Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps

Linear Technology 

TYPICAL PERFOR A CE CHARACTERISTICS

LT1490A/LT1491A

Undistorted Output Swing

vs Frequency

35

VS = ±15V

30

DISTORTION ≤1%

25

20

15

10

VS = 5V, 0V

5

0

0.1

1

10

100

FREQUENCY (kHz)

1490A G19

Total Harmonic Distortion + Noise

vs Frequency

10 VS = 3V, 0V

VOUT = 2VP-P

VCM = 1.2V

1 RL = 50k

0.1

0.01

0.001

0.01

AV = –1

AV = 1

0.1

1

FREQUENCY (kHz)

Open-Loop Gain

10

1490A G22

VS = ±15V

RL = 2k RL = 10k

RL = 50k

Settling Time to 0.1%

vs Output Step

10

8 VS = ±15V

6

4

AV = –1

AV = 1

2

0

–2

–4

–6

AV = –1

–8

AV = 1

– 10

0 20 40 60 80 100 120 140 160

SETTLING TIME (µs)

1490A F20

Total Harmonic Distortion + Noise

vs Load Resistance

10

VS = 3V TOTAL

AV = 1

VIN = 2VP-P AT 1kHz

1

VS = ±1.5V

VIN = ±1V

0.1

VS = 3V, 0V

VIN = 0.5V TO 2.5V

0.01

0.001

0.1

VS = 3V, 0V

VIN = 0.2V TO 2.2V

1

10

100

LOAD RESISTANCE TO GROUND (kΩ)

1490A G23

Large-Signal Response

Capacitive Load Handling,

Overshoot vs Capacitive Load

100

VS = 5V, 0V

90 ISOURCE = 170µA

80

70

60

50

AV = 10

40

AV = 1 AV = 2 AV = 5

30

20

10

0

10

100

1000

10000

CAPACITIVE LOAD (pF)

1490A G21

Total Harmonic Distortion + Noise

vs Output Voltage

10

RL = 10k

VCM = HALF SUPPLY

f = 1kHz

1

0.1

AV = –1

VS = ±1.5V

AV = 1

VS = ±1.5V

0.01

AV = 1

VS = 3V, 0V

AV = –1

VS = 3V, 0V

0.001

0

1

2

OUTPUT VOLTAGE (VP-P)

3

1490A G24

Small-Signal Response

–10V 0V 10V

OUTPUT VOLTAGE (5V/DIV)

1490A G25

VS = ±15V

AV = –1

1490A G26

VS = ±15V

AV = 1

1490A G27

sn1490, 14901afbs

9

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