OP249

–15–

REV. C

OP249 SPICE MACRO-MODEL

Figures 53 and Table I show the node and net list for a SPICE

macromodel of the OP249 The model is a simplified version of

the actual device and simulates important dc parameters such as

slew rate, gain and phase response and CMR change with fre-

quency are also simulated by the model.

99

I1

V2

4

7

3

J1

J2

R3

R4

C2

5

6

50

2

IN–

IN+

R1

R2

V3

10

D2

D1

8

9

R5

C3

C4

R6

G3

G4

R8

R7

13

C6

C5

12

R9

R10

G6

G5

R11

R12

R13

R14

L2

L1

G1

G2

1

14

15

16

G7

99

17

G8

C9

R15

R16

C10

C11

R17

R18

C12

G11

18

19

20

L3

G12

C13

C14

G13

G14

R22

R21

R20

R19

G9

G10

21

22

L4

50

50

99

G15

G16

R23

R24

C15

C16

R26

R25

24

23

25

26

D3

D4

D7

D8

G17

G18

R27

R28

L5

30

29

D5

D6

G19

G20

27

28

+–

+–

V4

V5

Figure 53. OP249 Macro-Model

The model uses typical parameters for the OP249. The poles

and zeros in the model were determined from the actual open

and closed-loop gain and phase response of the OP249. In this

way the model presents an accurate ac representation of the

actual device. The model assumes an ambient temperature of

25

°C.