REV. A

OP215

–7–

BASIC CONNECTIONS

OP215

B

OP215

A

1

7

100k

200

100k

3

2

5

6

8

+15V

–15V

NOTES

2. RESISTORS ARE TYPE

RN55D,

1%

4

Figure 5. Burn-In Circuit

APPLICATIONS INFORMATION

Dynamic Operating Considerations

As with most amplifiers, care should be taken with lead dress,

component placement, and supply de-coupling in order to ensure

stability. For example, resistors from the output to an input should

be placed with the body close to the input to minimize “pick up”

and maximize the frequency of the feedback pole by minimizing

the capacitance from the input to ground.

A feedback pole is created when the feedback around any amplifier

is resistive. The parallel resistance and capacitance from the

input of the device (usually the inverting input) to ac ground

sets the frequency of the pole. In many instances, the frequency

of this pole is much greater than the expected 3 dB frequency of

the closed-loop gain and, consequently, there is negligible effect

on stability margin. However, if the feedback pole is less than

approximately six times the expected 3 dB frequency, a lead

capacitor should be placed from the output to the negative input

of the op amp. The value of the added capacitor should be such

that the RC time constant of this capacitor and the resistance it

parallels is greater than, or equal to, the original feedback pole

time constant.

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

8-Lead CERDIP

(Z-Suffix)

1

4

85

0.310 (7.87)

0.220 (5.59)

PIN 1

0.005 (0.13)

MIN

0.055 (1.4)

MAX

0.100 (2.54) BSC

15°

0°

0.320 (8.13)

0.290 (7.37)

0.015 (0.38)

0.008 (0.20)

SEATING

PLANE

0.200 (5.08)

MAX

0.405 (10.29) MAX

0.150

(3.81)

MIN

0.200 (5.08)

0.125 (3.18)

0.023 (0.58)

0.014 (0.36)

0.070 (1.78)

0.030 (0.76)

0.060 (1.52)

0.015 (0.38)

8-Lead Plastic DIP

(P-Suffix)

SEATING

PLANE

0.060 (1.52)

0.015 (0.38)

0.210

(5.33)

MAX

0.022 (0.558)

0.014 (0.356)

0.160 (4.06)

0.115 (2.93)

0.070 (1.77)

0.045 (1.15)

0.130

(3.30)

MIN

8

1

4

5

PIN 1

0.280 (7.11)

0.240 (6.10)

0.100 (2.54)

BSC

0.430 (10.92)

0.348 (8.84)

0.195 (4.95)

0.115 (2.93)

0.015 (0.381)

0.008 (0.204)

0.325 (8.25)

0.300 (7.62)