OP27A, OP27C, OP27E, OP27G

OP37A, OP37C, OP37E, OP37G

LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS

SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994

2–13

POST OFFICE BOX 655303

POST OFFICE BOX 1443

OP27

PHASE MARGIN AND

GAIN-BANDWIDTH PRODUCT

vs

FREE-AIR TEMPERATURE

TA – Free-Air Temperature – °C

– 75

– 50

– 25

0

50

75

100

125

25

VCC

± = ±15 V

GBW (f = 100 kHz)

75

°

65

°

55

°

45

°

35

°

8.6

8.2

7.8

7.4

7

80

°

75

°

70

°

65

°

60

°

55

°

50

°

45

°

40

°

35

°

30

°

– 50

– 25

0

25

50

75

100

125

TA – Free-Air Temperature – °C

OP37

PHASE MARGIN AND

GAIN-BANDWIDTH PRODUCT

vs

FREE-AIR TEMPERATURE

GBW (f = 10 kHz)

85

80

75

70

65

60

55

50

45

40

φm

φm

VCC

± = ±15 V

80

°

70

°

60

°

50

°

40

°

85

°

10.6

10.2

9.8

9.4

9

11

Figure 20

Figure 21

EQUIVALENT INPUT NOISE VOLTAGE

vs

BANDWIDTH

VCC

± = ±15 V

RS = 20 Ω

TA = 25°C

10

1

0.1

0.01

0.1

110

100

Bandwidth – kHz

(0.1 Hz to frequency indicated)

TOTAL EQUIVALENT INPUT NOISE VOLTAGE

vs

SOURCE RESISTANCE

10 k

1 k

100

100

10

1

RS – Source Resistance – Ω

–

+

RS = R1 + R2

R1

R2

f = 1 kHz

Resistor Noise Only

f = 10 Hz

VCC

± = ±15 V

BW = 1 Hz

TA = 25°C

Figure 22

Figure 23

† Data for temperatures below – 25

°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.