OP27A, OP27C

LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER

SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010

14

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS

OP27

VOLTAGE FOLLOWER

SMALL-SIGNAL

PULSE RESPONSE

80

60

40

20

0

− 20

− 40

− 60

− 80

t − Time −

μs

0

0.5

1

1.5

2

2.5

3

VCC ± = ± 15 V

AV = 1

CL = 15 pF

TA = 25°C

OP27

VOLTAGE FOLLOWER

LARGE-SIGNAL

PULSE RESPONSE

8

6

4

0

− 2

− 4

− 6

− 8

2

t − Time −

μs

02

46

8

10

12

VCC ± = ± 15 V

AV = − 1

TA = 25°C

Figure 24

Figure 25

APPLICATION INFORMATION

general

The OP27 series devices can be inserted directly onto OP07, OP05,

μA725, and SE5534 sockets with or without

removing external compensation or nulling components. In addition, the OP27 can be fitted to

μA741 sockets

by removing or modifying external nulling components.

noise testing

Figure 26 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the OP27. The frequency

response of this noise tester indicates that the 0.1-Hz corner is defined by only one zero. Because the time limit

acts as an additional zero to eliminate noise contributions from the frequency band below 0.1 Hz, the test time

to measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds.

Measuring the typical 80-nV peak-to-peak noise performance of the OP27 requires the following special test

precautions: