REV. D

OP497

–10–

OP497 SPICE MACRO-MODEL

Figure 12 and Table I show the node and net list for a SPICE

macro-model of the OP497. The model is a simplified version of

the actual device and simulates important dc parameters such as

rate, gain and phase response, and CMR change with frequency

are also simulated by the model.

The model uses typical parameters for the OP497. The poles and

zeros in the model were determined from the actual open and

closed-loop gain and phase response of the OP497. In this way,

the model presents an accurate ac representation of the actual

device. The model assumes an ambient temperature of 25

°C.

– +

99

20

21

23

24

25

26

22

R16

D9

G4

G5

D10

G7

L1

V4

V3

G6

D8

D7

D5

D6

27

50

R18

R19

R17

G2

R10

CCM

98

ECM

RCM1

RCM2

15

16

C5

19

CNZ

ENZ

RNZ1

RNZ2

17

18

G2

R15

20

C5

–IN

+IN

8

9

7

2

1

R1

R2

D1

D2

50

10

11

56

12

98

14

13

G1

C3

V2

C2

Q1

Q2

R6

R5

99

V1

– +

R3

R4

D3

D4

R7

Figure 12. OP497 Macro Model